Document:

EXHIBIT 10.24

 Exhibit 10.24 
 STOCK OPTION AGREEMENT (the “Agreement”), dated as of December 20, 2006 between Deltek Systems, Inc., a Virginia corporation (together with its successors, the “Company”), and
Richard Lowenstein (the “Optionee”). 
 RECITALS 
 WHEREAS, the Optionee commenced employment with the Company on June 26, 2006 pursuant to an employment letter, dated as of May 26, 2006, by and
between the Company and the Optionee; and 
 WHEREAS, by Unanimous Written Consent effective October 23, 2006 (the “Date of
Grant”), the Board of Directors of the Company granted the Optionee the right and option to purchase 135,000 shares of Common Stock with a per share exercise price of $10.19 (the “Option”); and 
 WHEREAS, the Optionee and the Company now intend to evidence the Option; 
 NOW, THEREFORE, in consideration of the mutual covenants contained herein and for other good and valuable consideration, the receipt and sufficiency of which are acknowledged, the parties agree as follows: 

Section 1. Grant of Option. This Agreement evidences the Optionee’s right and option (the “Option”) to purchase 135,000
shares of Common Stock (subject to adjustment as provided in Section 7 of the Plan) on the terms and conditions set forth in this Agreement and in the Deltek Systems, Inc. 2005 Stock Option Plan (the “Plan”), a copy of which is
being delivered to the Optionee concurrently herewith and is made a part hereof as if fully set forth herein. Except as otherwise defined herein, capitalized terms used in this Agreement shall have the same definitions as set forth in the Plan. The
Option is not intended to qualify as an Incentive Stock Option within the meaning of Section 422 of the Code. 
 Section 2.
Purchase Price. The price (the “Option Price”) at which the Optionee shall be entitled to purchase shares of Common Stock upon the exercise of this Option shall be $10.19 per share (subject to adjustment as provided in
Section 7 of the Plan). 
 Section 3. Duration of Option. The Option shall be exercisable to the extent and in the manner
provided herein for a period of ten years after the Date of Grant; provided, however, that the Option may be earlier terminated as provided in Section 4, 6, 7, 8 or 9 hereof. 
 Section 4. Exercisability of Option. 
 4.1. Amount of Exercise. Subject to the provisions of this Agreement and the Plan, the Option shall be exercisable in accordance with the following schedule: 
 (a) prior to June 26, 2007, the Option may not be exercised; 

 (b) on or after June 26, 2007 but before June 26, 2008, the Option may be exercised to acquire
up to 25% of the aggregate number of shares of Common Stock that may be purchased pursuant to the Option as set forth in Section 1.1 hereof, less any shares previously acquired pursuant to the Option; 
 (c) on or after June 26, 2008 but before June 26, 2009, the Option may be exercised to acquire up to 50% of the aggregate number of shares of
Common Stock that may be purchased pursuant to the Option as set forth in Section 1.1 hereof, less any shares previously acquired pursuant to the Option; 
 (d) on or after June 26, 2009 but before June 26, 2010, the Option may be exercised to acquire up to 75% of the aggregate number of shares of Common Stock that may be purchased pursuant to the Option as set
forth in Section 1.1 hereof, less any shares previously acquired pursuant to the Option; and 
 (e) on or after June 26, 2010, the
Option may be exercised to acquire up to 100% of the aggregate number of shares of Common Stock that may be purchased pursuant to the Option as set forth in Section 1.1 hereof, less any shares previously acquired pursuant to the Option;

 provided, however, that notwithstanding the foregoing schedule as to exercisability, in the event of a Change in Control occurring while the
Optionee is employed by the Company, the Option shall become exercisable in full to the extent then unexercisable if your employment is terminated on the date of or within two years following a Change in Control either by the Company or its
successor without Cause or by you for Good Reason. For purposes of the foregoing proviso, the terms “Cause,” “Change in Control” and “Good Reason” shall have the meanings set forth in the employment
letter, dated as of May 26, 2006, between the Company and the Optionee (the “Employment Letter”). 
 4.2.
Sales or Other Events. The Company shall give the Optionee at least five business days’ notice (or, if not practicable, such shorter notice as may be practicable) (the “Sale Notice”) prior to the
anticipated date of the consummation of a sale by the NMP Entities of any of their shares of Common Stock to a Third Party (an “NMP Sale”). The Optionee shall be permitted to exercise the Option to the extent provided in this
Section 4.2 in order to participate in the NMP Sale; provided, that, in the event of an NMP Sale in which the Optionee would be required to participate pursuant to Section 3.5 of the Optionee Shareholders’ Agreement were the
Optionee then a party to such agreement, the Company may require the Optionee to exercise the Option to the extent necessary to enable the Optionee to participate therein or forfeit the Option (or portion thereof, as applicable). Notwithstanding
anything in Section 4.1 to the contrary, in connection with an NMP Sale, the Option may be exercised to the extent of the excess, if any, of (a) the number of shares with respect to which the Optionee would be entitled to, or is being
required to, participate in an NMP Sale, and will so participate, over (b) the number of shares previously issued to the Optionee upon exercise of the Option and not previously disposed of. Unless the Company elects to allow an earlier exercise
of the Option, the exercise of an Option in 

  

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connection with an NMP Sale shall be made in accordance with Section 5 and shall be made concurrently with the consummation of the NMP Sale, and, in the
event the NMP Sale is not consummated, any notice of exercise submitted in connection with the NMP Sale shall be of no force or effect and the Option shall be exercisable thereafter to the extent it would have been exercisable if no Sale Notice or
notice of exercise had been given. In lieu of permitting the Optionee to participate in a Public Offering of all or a portion of the shares of Common Stock owned by the NMP Entities (a “Secondary Public Offering”), the Company, at
its option, may instead cause the Option and the underlying shares to be registered under applicable securities laws, or make other arrangements consistent with such laws, so as to permit the Optionee to sell for a period of time after the Secondary
Public Offering the same number of shares that the Optionee would have been able to sell in the Secondary Public Offering but for this sentence. 
 4.3. Termination of Option. Subject to the provisions of Section 9 hereof, the Option shall terminate simultaneously with the consummation of a Total Sale to the extent that the Option has not theretofore been
exercised. 
 4.4. Exercises Under Multiple Option Agreements. Notwithstanding anything herein to the contrary, if, in connection with
an NMP Sale, the Optionee shall be entitled to acquire shares of Common Stock pursuant to Section 4.2 hereof and pursuant to the analogous provisions of one or more other stock option agreements between the Optionee and the Company (any such
agreement, including this Agreement, an “Option Agreement”), then the Company shall have the right, at its option, to designate the Option Agreement or Option Agreements pursuant to which the Optionee may exercise options for
purposes of the Optionee’s participation in an NMP Sale, provided that in no event shall any such determination reduce the aggregate number of shares that the Optionee would otherwise be entitled to sell in connection with such NMP Sale.

 Section 5. Manner of Exercise and Payment. 
 5.1. Notice of Exercise. Subject to the terms and conditions of this Agreement and the Plan, the Option may be exercised by delivery of
written notice to the Company. Such notice shall state that the Optionee is electing to exercise the Option, shall set forth the number of shares of Common Stock in respect of which the Option is being exercised and shall be signed by the Optionee
or, where applicable, by the Optionee’s Legal Representative. 
 5.2. Deliveries. The notice of exercise described in
Section 5.1 hereof shall be accompanied by (a) payment of the full purchase price for the shares in respect of which the Option is being exercised, together with any withholding taxes that may be due as a result of the exercise of the
Option, such payment to be made by delivery to the Company of a certified or bank check payable to the order of the Company or cash by wire transfer or other immediately available funds to an account designated by the Company, and (b) a fully
executed Optionee Shareholders’ Agreement (a copy of which, in the form to be executed by the Optionee (which may differ from optionee to optionee and from time to time), will be supplied to the Optionee 

  

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upon request) and the undated stock power referred to in Section 6.14(a)(ii) of the Optionee Shareholders’ Agreement. 
 5.3. Issuance of Shares. Upon receipt of notice of exercise, full payment for the shares of Common Stock in respect of which the Option
is being exercised and a fully executed Optionee Shareholders’ Agreement and stock power, and subject to Section 9 of the Plan, the Company shall take such action as may be necessary under applicable law to effect the issuance to the
Optionee of the number of shares of Common Stock as to which such exercise was effected. No fractional shares of Common Stock (or cash in lieu thereof) shall be issued upon exercise of an Option and the number of shares of Common Stock that may be
purchased upon exercise shall be rounded to the nearest whole number. 
 5.4. Shareholder Rights. The Optionee shall not be
deemed to be the holder of, or to have any of the rights of a holder with respect to, any shares of Common Stock subject to the Option until: (a) the Option shall have been exercised in accordance with the terms of this Agreement and the
Optionee shall have paid the full purchase price for the number of shares in respect of which the Option was exercised and any withholding taxes due, (b) the Optionee shall have delivered the fully executed Optionee Shareholders’ Agreement
and stock power to the Company, (c) the Company shall have issued the shares to the Optionee, and (d) the Optionee’s name shall have been entered as a shareholder of record on the books of the Company. Upon the occurrence of all of
the foregoing events, the Optionee shall have full ownership rights with respect to such shares, subject to the provisions of the Optionee Shareholders’ Agreement. 
 Section 6. Certain Restrictions. 
 6.1. No Sale or Transfer. The
Optionee shall not sell, transfer, assign, exchange, pledge, encumber or otherwise dispose of the Option or any portion thereof. 
 6.2.
Employment Termination. If the Optionee shall no longer be employed on a full-time basis by the Company for any reason whatsoever (including by reason of death, permanent disability or adjudicated incompetency)
(“Terminated” or a “Termination”), irrespective of whether the Optionee receives, in connection with the Termination, any severance or other payment from the Company under any employment agreement or otherwise,
(i) the Option, to the extent it is not exercisable pursuant to Section 4.1 hereof at the date of such Termination, shall terminate on, and shall be of no further force and effect from and after, the date of such Termination, and
(ii) the Option, to the extent it is exercisable pursuant to Section 4.1 hereof at the date of such Termination (the “Exercisable Portion of the Option”), shall be exercisable by the Optionee during the Post-Termination
Exercise Period (as defined below), but in no event after the expiration of the term of the Option, and, until exercised, the Exercisable Portion of the Option shall continue to be subject to the terms of this Agreement, including Section 4.2
hereof. If the Optionee does not exercise any portion of the Exercisable Portion of the Option within the Post-Termination Exercise Period, such portion shall terminate and shall be of no further force and effect following the close of business on
the last day of the Post-Termination Exercise Period. 
  

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 “Post-Termination Exercise Period” shall mean the period commencing on the date of the
Optionee’s Termination and ending at the close of business on the 180th day after the date of the Optionee’s Termination. Notwithstanding anything in this Agreement or the Plan to the contrary, and in addition to the rights of the Company
set forth in Section 7.2, the Option, whether exercisable or unexercisable, shall immediately terminate upon a Termination by the Company for Cause. 
 Section 7. Prohibited Activities. 
 7.1. Prohibition Against Certain Activities. The
Optionee agrees that the Optionee will not at any time (a) disclose or furnish to any other Person or use for the Optionee’s own or any other Person’s account any Confidential or Proprietary Information (other than in the course of
the Optionee’s employment with the Company) except for Permitted Disclosures (a “Prohibited Disclosure”), (b) directly or indirectly solicit for employment, including without limitation, recommending to any subsequent
employer the solicitation for employment of, any employee of the Company or any Affiliate thereof (provided, that this clause (b) shall expire on the second anniversary of the date of the Optionee’s Termination) (a
“Prohibited Solicitation”) and (c) commit a breach of the provisions of Section 6.1 (a “Prohibited Transfer”). 
 “Confidential or Proprietary Information” shall mean any non-public information about the Company or any Affiliate thereof which was acquired by the Optionee during the Optionee’s employment with
the Company or any Affiliate thereof and which has or is reasonably likely to have competitive value to the Company or any Affiliate thereof or to a Competitor, but excluding information that is or becomes generally available to the public other
than as a result of a breach of this Agreement by the Optionee. 
 “Permitted Disclosure” means the disclosure of
Confidential or Proprietary Information (i) made with the prior written consent of the Company, (ii) required to be disclosed by law or legal process or (iii) if the Optionee is a party to the Recapitalization Agreement, dated as of
December 23, 2004, to which (among others) the Company and the NMP Entities are parties, as may reasonably be necessary in connection with the performance of any indemnification obligations thereunder. 
 7.2. Right to Terminate Option. The Optionee understands and agrees that the Company is granting to the Optionee the Option to reward the Optionee
for the Optionee’s future efforts and loyalty to the Company and its Affiliates by giving the Optionee the opportunity to participate in the potential future appreciation of the Company. Accordingly, if, while any portion of the Option is
outstanding, (a) the Optionee engages in any Prohibited Disclosure or breaches or violates the Optionee’s obligations relating to the non-disclosure or non-use of confidential or proprietary information under any Employee Agreement to
which the Optionee is a party, or (b) the Optionee engages in any Prohibited Solicitation or breaches or violates any non-solicitation obligations under any Employee Agreement to which the Optionee is a party, or (c) the Optionee engages
in any Prohibited Transfer, or (d) the Optionee engages in any Competitive Activity or breaches or violates any non-competition obligations under any 

  

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Employee Agreement to which the Optionee is a party, or (e) the Optionee is convicted of a felony against the Company or any of its Affiliates, then, in
addition to any other rights and remedies available to the Company, the Company shall be entitled, at its option, exercisable by written notice, to terminate the Option (including the Exercisable Portion of the Option), or any unexercised portion
thereof, which shall then be of no further force and effect. 
 “Competitive Activity” shall mean, directly or indirectly,
(i) owning, managing, operating, joining, controlling, being employed by, or participating in the ownership, management, operation or control of, or being connected in any manner with, including, without limitation, holding any position as a
shareholder, director, officer, consultant, independent contractor, employee or partner of, spokesman for, or investor in, any Competitor, or (ii) acting as a Competitor in an individual capacity; provided, that, in no event
(i) shall ownership by the Optionee of five percent (5%) or less of the outstanding securities of any class of any issuer whose securities are registered under the Securities Exchange Act of 1934, as amended, standing alone, be considered
Competitive Activity, so long as the Optionee does not have, or exercise, any rights to manage or operate the business of such issuer other than rights as a shareholder thereof, (ii) shall being employed by a Competitor, standing alone, be
considered Competitive Activity, so long as (A) the Competitor has more than one discrete and readily distinguishable part of its business, (B) the Optionee’s duties are not at or involving the part of the Competitor’s business
that constitutes a Competing Business, including, without limitation, serving in a capacity where any Person involved in the part of the Competitor’s business that constitutes a Competing Business reports to the Optionee and (C) the
Optionee notifies the Company of such employment prior to commencement of his or her employment with such Competitor, or (iii) shall being employed by a licensee of any Company Product and providing Competing Services to such licensee, standing
alone, be considered Competitive Activity. 
 “Competitor” shall mean any Person that is engaged in (or intends or proposes
to engage in, or has been organized for the purpose of engaging in) a Competing Business in the Company’s Market Area. 
 “Company’s Market Area” shall mean (x) the United States (including each state and the District of Columbia), and (y) each country or territory other than the United States which accounted for at least two
and one-half percent (2-1/2%) of software license revenue by the Company and its subsidiaries during the 12 months immediately prior to the date the Optionee’s employment Terminates as reported on the Company’s financial statements.

 “Competing Business” shall mean the business of (a) developing, implementing, marketing and/or selling any Company
Products or Competing Products or (b) developing, providing, performing, marketing or selling any Competing Services. 
 “Company Product” shall mean any project-based business management and/or sales management software and/or other product that, as of the date the Optionee’s employment 

  

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Terminates, the Company or any of its Affiliates is developing, implementing, marketing and/or selling. 
 “Competing Product” shall mean any product that competes with any Company Product. 
 “Competing Service” shall mean implementation, consulting, support, maintenance, development and/or training services relating to or in
connection with the use of any Company Products or Competing Products. 
 “Employee Agreement” shall mean any agreement
between the Company and the Optionee that contains non-competition, non-solicitation or confidentiality restrictions on the Optionee. 
 Section 8.
Effect of Certain Transactions. Subject to Section 9, in the event of (a) the liquidation or dissolution of the Company or (b) a merger or consolidation of the Company (a “Transaction”), the Option shall
continue in effect in accordance with its terms, except that following the Transaction either (i) each outstanding Option shall be treated as provided for in the plan of liquidation or dissolution adopted, or the agreement entered into, in
connection with the Transaction or (ii) if not so provided in such plan or agreement, the Optionee shall be entitled to receive in respect of each share of Common Stock subject to the Option, upon exercise of the Option, the same number and
kind of stock, securities, cash, property or other consideration that each holder of a share of Common Stock was entitled to receive in the Transaction in respect of a share of Common Stock; provided, however, that such stock,
securities, cash, property, or other consideration shall remain subject to all of the conditions, restrictions and performance criteria which were applicable to the Option prior to such Transaction. 
 Section 9. Continuation of Plan upon Total Sale. Upon the effective date of any Total Sale, any unexercised portion of the Option shall terminate
unless provision shall be made in writing in connection with such Total Sale for the continuance of the Plan and such unexercised portion of the Option or for the assumption of such unexercised portion of the Option by a successor to the Company or
for the substitution for such unexercised portion of the Option of new options covering shares or other securities or other equity interests of such successor with appropriate adjustments as to number and kind of shares or other securities or other
equity interests, option prices and other terms of such new options. In the event that provision in writing is made as aforesaid in connection with a Total Sale, the unexercised portion of the Option or the new options substituted therefor shall
continue in the manner and under the terms provided in the Plan and this Agreement and in such writing. 
 Section 10. Miscellaneous.

 10.1. Acknowledgment. The Optionee hereby acknowledges receipt of a copy of the Plan and agrees to be bound by all the terms and
provisions thereof as the same may be amended from time to time. The Optionee hereby acknowledges that the Optionee has reviewed 

  

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the Plan and this Agreement and understands the Optionee’s rights and obligations thereunder and hereunder. The Optionee also acknowledges that the
Optionee has been provided with such information concerning the Company, the Plan and this Agreement as the Optionee and the Optionee’s advisors have requested. 
 10.2. Resolution of Disputes. Any dispute or disagreement which may arise under, or as a result of, or which may in any way relate to, the interpretation, construction or application of this Agreement
shall be determined by the Committee, in good faith, whose determination shall be final, binding and conclusive for all purposes. 
 10.3.
Governing Law; Compliance with Law; Venue and Service of Process; Waiver of Jury Trials. 
 (a) Governing Law. This
Agreement shall be construed and enforced in accordance with, and the rights and obligations of the parties hereto shall be governed by, the laws of the State of New York, without giving effect to the conflicts of law principles thereof. 

(b) Compliance with Law. Notwithstanding anything herein to the contrary, the Company shall not be required to issue shares pursuant to the
exercise of any Option granted under this Agreement and the Plan unless such exercise and issuance comply with all applicable laws, including, without limitation, all applicable federal and state securities laws. 
 (c) Venue and Service of Process. By execution and delivery of this Agreement, each of the parties hereto hereby irrevocably and unconditionally
(i) consents to submit to the exclusive jurisdiction of the federal and state courts of the State of New York located in New York County (collectively, the “Selected Courts”) for any action or proceeding arising out of or
relating to this Agreement and the transactions contemplated hereby, and agrees not to commence any action or proceeding relating thereto except in the Selected Courts, provided, that, a party may commence any action or proceeding in a court
other than a Selected Court solely for the purpose of enforcing an order or judgment issued by one of the Selected Courts; (ii) consents to service of any process, summons, notice or document in any action or proceeding by registered
first-class mail, postage prepaid, return receipt requested or by nationally recognized courier guaranteeing overnight delivery in accordance with Section 10.6 hereof and agrees that such service of process shall be effective service of process
for any action or proceeding brought against it in any such court, provided, that, nothing herein shall affect the right of any party hereto to serve process in any other manner permitted by law; (iii) waives any objection to the laying
of venue of any action or proceeding arising out of this Agreement or the transactions contemplated hereby in the Selected Courts; and (iv) waives and agrees not to plead or claim in any court that any such action or proceeding brought in any
such Selected Court has been brought in an inconvenient forum. 
 (d) Waiver of Jury Trial. EACH OF THE PARTIES HEREBY IRREVOCABLY, TO
THE EXTENT NOT PROHIBITED BY APPLICABLE LAW THAT CANNOT BE WAIVED, WAIVES, AND COVENANTS THAT IT WILL NOT ASSERT 

  

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(WHETHER AS PLAINTIFF, DEFENDANT OR OTHERWISE), ANY RIGHT TO TRIAL BY JURY IN ANY ACTION OR PROCEEDING IN WHOLE OR IN PART ARISING OUT OF OR RELATING TO THIS
AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY, WHETHER NOW EXISTING OR HEREAFTER ARISING, AND WHETHER SOUNDING IN CONTRACT, TORT OR OTHERWISE, AND AGREES THAT ANY OF THEM MAY FILE A COPY OF THIS PARAGRAPH WITH ANY COURT AS WRITTEN EVIDENCE OF
THE KNOWING, VOLUNTARY AND BARGAINED-FOR AGREEMENT AMONG THE PARTIES IRREVOCABLY TO WAIVE ITS RIGHT TO TRIAL BY JURY IN ANY SUCH ACTION OR PROCEEDING. SUCH ACTION OR PROCEEDING SHALL INSTEAD BE TRIED IN A SELECTED COURT BY A JUDGE SITTING WITHOUT A
JURY. 
 10.4. Specific Performance. The parties hereto acknowledge that there will be no adequate remedy at law for a violation of
any of the provisions of this Agreement and that, in addition to any other remedies which may be available, all of the provisions of this Agreement shall be specifically enforceable in accordance with their respective terms. 
 10.5. Severability. Whenever possible, each provision or portion of any provision of this Agreement will be interpreted in such manner as to be
effective and valid under applicable law but the invalidity or unenforceability of any provision or portion of any provision of this Agreement in any jurisdiction shall not affect the validity or enforceability of the remainder of this Agreement in
that jurisdiction or the validity or enforceability of this Agreement, including that provision or portion of any provision, in any other jurisdiction. In addition, should a court or arbitrator determine that any provision or portion of any
provision of this Agreement is not reasonable or valid, either in period of time, geographical area, or otherwise, the parties hereto agree that such provision should be interpreted and enforced to the maximum extent which such court or arbitrator
deems reasonable or valid. 
 10.6. Notice. Unless otherwise provided herein, all notices, requests and other communications provided
for under the terms of this Agreement shall be in writing. Any notice, request or other communication hereunder shall be sent by (i) personal delivery, (ii) facsimile during normal business hours, with confirmation of receipt, to the
number indicated, (iii) reputable commercial overnight delivery service courier or (iv) registered or certified mail, return receipt requested, postage prepaid, in each case addressed to the intended recipient as set forth below:

 (a) If to the Company, to: 
 Deltek Systems, Inc. 
 13880 Dulles Corner Lane 
 Herndon, Virginia 20171 
 Attention: Chief Financial Officer and General Counsel 
 Facsimile: (703) 885-9838 
  

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 (b) With a copy to (which shall not constitute notice): 
 Fried, Frank, Harris, Shriver & Jacobson LLP 
 One New York Plaza 
 New York, New York 10004 
 Facsimile: (212) 859-4000 
 Attention: Aviva F. Diamant, Esq. 
 (c) If to the Optionee, at the most recent address and facsimile number contained in the Company’s records, and if to the Legal Representative, to
such Person at the address of which the Company is notified in accordance with this Section 10.6. 
 All such notices, requests and other communications
shall be deemed to have been given when received. Any party may change its facsimile number or its address to which notices, requests and other communications hereunder are to be delivered by giving the other parties hereto notice in the manner then
set forth. 
 10.7. Binding Effect; Assignment; Third-Party Beneficiaries. This Agreement shall be binding upon and inure to the
benefit of and be enforceable by the parties hereto and any of their respective successors, personal representatives and permitted assigns who agree in writing to be bound by the terms hereof. Neither this Agreement nor any of the rights, interests
or obligations hereunder shall be assigned by the Optionee without the prior written consent of the Company. In addition, each of the NMP Entities shall be a third party beneficiary of this Agreement and shall be entitled to enforce this Agreement.
In connection with the transfer of any securities of the Company held by an NMP Entity, each NMP Entity shall be entitled to assign its rights hereunder to an Affiliate of such NMP Entity or a partner of such NMP Entity or Affiliate and, subject to
such NMP Entities’ compliance with Section 3.3 of the Optionee Shareholders’ Agreement, if applicable, to a Third Party. 
 10.8. Amendments and Waivers. This Agreement and any of the provisions hereof may be amended, waived (either generally or in a particular instance and either retroactively or prospectively), modified or supplemented, in
whole or in part, only by written agreement signed by the Company and the Optionee; provided, that, the observance of any provision of this Agreement may be waived in writing by the party that will lose the benefit of such provision as a
result of such waiver. The waiver by any party hereto of a breach of any provision of this Agreement shall not operate or be construed as a further or continuing waiver of such breach or as a waiver of any other or subsequent breach, except as
otherwise explicitly provided for in such waiver. Except as otherwise expressly provided herein, no failure on the part of any party to exercise, and no delay in exercising, any right, power or remedy hereunder, or otherwise available in respect
hereof at law or in equity, shall operate as a waiver thereof, nor shall any single or partial exercise of such right, power or remedy by such party preclude any other or further exercise thereof or the exercise of any other right, power or remedy.

  

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 10.9. Counterparts. This Agreement may be executed in any number of counterparts, each of which
shall be deemed an original, but all such counterparts shall together constitute one and the same instrument. 
 10.10.
Entire Agreement. This Agreement and the Plan and, upon execution thereof, the Optionee Shareholders’ Agreement, constitute the entire agreement, and supersede all prior agreements and understandings, oral and written, between the
parties hereto with respect to the Option granted hereby. 
 10.11. Withholding. The Company shall have the right to deduct from any
amount payable under this Agreement any taxes or other amounts required by applicable law to be withheld. The Optionee agrees to indemnify the Company against any federal, state and local withholding taxes for which the Company may be liable in
connection with the Optionee’s acquisition, ownership or disposition of any Common Stock. 
 10.12. No Right to Continued
Employment. This Agreement shall not confer upon the Optionee any right with respect to continuance of employment by the Company or any Affiliate thereof, nor shall it interfere in any way with the right of the Company or any Affiliate thereof
to terminate such Optionee’s employment at any time. 
 10.13. General Interpretive Principles. Whenever used in this Agreement,
except as otherwise expressly provided or unless the context otherwise requires, any noun or pronoun shall be deemed to include the plural as well as the singular and to cover all genders. The headings of the sections, paragraphs, subparagraphs,
clauses and subclauses of this Agreement are for convenience of reference only and shall not in any way affect the meaning or interpretation of any of the provisions hereof. Unless otherwise specified, the terms “hereof,”
“herein” and similar terms refer to this Agreement as a whole (including the exhibits, schedules and disclosure statements hereto), and references herein to Sections refer to Sections of this Agreement. Words of inclusion shall not be
construed as terms of limitation herein, so that references to “include,” “includes” and “including” shall not be limiting and shall be regarded as references to non-exclusive and non-characterizing illustrations.

  

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 IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the date first written above.

  

									
		 		 	DELTEK SYSTEMS, INC.
				
	/s/ Richard Lowenstein	 		 	By:	 	/s/ Kevin Parker
	Richard Lowenstein	 		 		 	Kevin Parker
		 		 		 	President and Chief Executive Officer
				
	Date: February 2, 2007	 		 	Date:	 	December 20, 2006

  

 - 12 -Exhibit 10.25

 Exhibit 10.25 
 February 8, 2006 
 Carolyn Parent 
 16730
Whirlaway Court 
 Leesburg, VA 20176 
 Dear Carolyn: 

I am pleased to offer you the position of Executive Vice President, Worldwide Sales of Deltek Systems, Inc. (the “Company”). I am very
excited about the Company’s future and equally excited at the prospect of your joining our team. The following are the terms and conditions of your offer. 
  

	 	1.	Start Date. We have agreed that you will start working for the Company on or about February 20, 2006. 

  

	 	2.	Reporting Responsibilities. As Executive Vice President, Worldwide Sales, you will report to me, although, as with all of the Company’s officers, you may also be called
on from time to time to give reports to the board of directors of the Company (the “Board”) directly. 

  

	 	3.	Base Salary and Annual Bonus. Your annual base salary will be $275,000, payable in accordance with the Company’s standard payroll policy, and will be reviewed
periodically. You will have an annual bonus target of $200,000. Bonuses will be paid quarterly, based on satisfaction of actual performance against agreed targets, and your actual bonuses may be more than or less than your annual bonus target. All
payments to you by the Company will be subject to any required withholding of taxes. Your quarterly bonus for the first two quarters after your start date will paid at a minimum achievement of 100% of target 

  

	 	4.	 Other Benefits. You will be provided with the Company’s standard benefits package in effect from time to time, which currently includes medical
coverage, 401(k) plan participation and four weeks of paid vacation. You will be reimbursed pursuant to the Company’s expense reimbursement policy in effect 

	 	 
from time to time for the covered business expenses that you incur in connection with your service to the Company. 

  

	 	5.	Insurance; Indemnification. From and after your start date and for so long as the Company maintains any directors and officers liability insurance policy, you will be
provided in respect of your service to the Company with the same coverage under such policy as is provided to other directors or officers of the Company in respect of their service to the Company. In addition, from and after your start date, the
Company will indemnify you to the maximum extent permitted under applicable law and/or the Company’s charter or by-laws to the extent that such indemnification is provided to other directors or officers of the Company. Such coverage and
indemnification will be provided, to the extent that you are entitled thereto, without regard to your termination of employment. 

  

	 	6.	Stock Options. On or as soon as practicable after your start date and upon approval of the Board, the Company will grant you an option to purchase 135,000 shares of common
stock, par value $0.001 per share, of the Company (and including any securities into which such shares are changed or for which such shares are exchanged) (the “Common Stock”), with a per share exercise price equal to the fair
market value of a share of Common Stock on the date of grant (as determined by the Board). These options will vest in 25% increments annually over four years from your start date, will be granted pursuant to the Company’s 2005 Stock Option Plan
and will be evidenced by a Stock Option Agreement in the form customarily used by the Company for its employees, a copy of which has been provided to you; provided, however, that, notwithstanding Section 4 of the Stock Option
Agreement, if your employment is terminated on the date of or within two years following a Change in Control either by the Company or its successor without Cause or by you for Good Reason, these options will become vested and exercisable in full to
the extent then unexercisable. For purposes of this letter, “Change in Control” will have the meaning set forth on Annex A hereto. 

  

	 	7.	At-Will Employment; Severance. You will have no set term of employment, and your employment will be at will. 

 If your employment is terminated before a Change in Control either by the Company without Cause or by you for Good Reason, then the Company shall continue
to pay you your then current base salary as of the date of termination for six months thereafter. In addition, upon any termination that entitles you to the foregoing severance benefits, the Company will also continue your coverage under the
Company’s medical benefit plan for twelve months at the active-employee premium rate. 
 If your employment is terminated on the date of
or within two years following a Change in Control either by the Company or its successor without Cause or by you for Good Reason, then the Company shall: (1) continue to pay you your then current base salary as of the date of termination for
twelve months thereafter, (2)

 
pay you a pro rata portion of your bonus for the period in which you are terminated (as computed under the Company’s or its successor’s bonus
programs in effect immediately prior to the termination), if any, which bonus shall be determined based on the actual results of the Company for the applicable bonus period, and your pro rata share of any such bonus shall be based upon the
percentage of the applicable bonus period that you were employed by the Company, and (3) continue your coverage under the Company’s medical benefit plan for twelve months at the active-employee premium rate. 
 The continuation of base salary will be paid in substantially equal installments over the applicable severance period in accordance with the
Company’s standard payroll practices with respect to active employees but not less frequently than monthly. The payment of a pro rata portion of your bonus (if any) will be paid in a lump sum at such time as bonuses are generally paid to
executives during the period in which you are terminated. Notwithstanding the preceding two sentences, if Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”), would cause the imposition of an excise tax
on the salary continuation severance payment or bonus award severance payment if paid as aforesaid, then (i) payment of the installments of the salary continuation severance payment will commence upon the earliest date that complies with
Section 409A without the imposition of the excise tax, and the first such installment will include all portions of the salary continuation severance payment that would have been paid but for the application of Section 409A to the salary
continuation severance payment, and (ii) the bonus award severance payment will be paid upon the earliest date that complies with Section 409A without the imposition of the excise tax. The Company’s obligations to make any payments
and (if applicable) continue the medical coverage as set forth in this section 7 is conditioned upon: (x) your continued compliance with your obligations under the Noncompetition Agreement, the form of which is attached hereto as Annex B, and
(y) your execution, delivery and non-revocation of a valid and enforceable general release of claims substantially in the form attached hereto as Annex C. 
 For purposes of this letter, “Cause” and “Good Reason” will have the meanings set forth on Annex B hereto. 
  

	 	8.	Employee Covenants. As a condition of your employment, not later than your start date, you will execute and deliver the Company’s form of Noncompetition Agreement, which
is attached hereto as Annex B. 

 If the foregoing terms and conditions are consistent with your understanding, please sign this letter
below and return a copy to me. Carolyn, I am confident that you will be a valuable addition to our team, and I look forward to working with you. 
  

			
	Very truly yours,	 	 
		
	DELTEK SYSTEMS, INC.	 	
		
	 /s/ Kevin Parker
	 	
	By: Kevin Parker	 	
	Its: President and Chief Executive Officer	 	

  

			
	ACCEPTED AND AGREED:	 	 
		
	 /s/ Carolyn Parent
	 	
	Carolyn Parent	 	

 Annex A 
 Definitions 
 “Cause” shall mean (A) a conviction of you for the commission of
a felony, (B) a commission by you of one or more acts involving fraud or gross misconduct that cause material damage to the Company, (C) a material violation by you of the Noncompetition Agreement or (D) your breach of any material
terms of this letter and such breach is not cured within 30 days after written notice by the Company to you identifying such breach. Prior to terminating your employment for Cause pursuant to clause (D), you shall be given (1) a written notice
of such determination setting forth the nature of such alleged Cause item and specifically stating the corrective action required, (2) a reasonable opportunity to meet with the Board (with the assistance of your counsel if you so elect) to
discuss such item and required corrective action and (3) a reasonable opportunity to take the required action and cure such item. 
 A
“Change in Control” will have occurred if (A) any third party not affiliated with New Mountain Partners II, L.P., New Mountain Affiliated Investors II, L.P. or Allegheny New Mountain Partners, L.P. or any of their affiliates
(collectively, “New Mountain”), but excluding the deLaski Shareholders (as defined in the Shareholders’ Agreement, dated as of April 22, 2005, to which (among others) the Company and New Mountain are parties), owns,
directly or indirectly, more voting capital stock of the Company than New Mountain owns or (B) a third party not so affiliated has or obtains the right to elect a majority of the Board. 
 “Good Reason” shall mean (A) (x) a material reduction, without your written consent, of the nature and scope of the
authorities, powers, functions or duties assigned to you or (y) any reduction, without your written consent, of your compensation (including, without limitation, your annual base salary or target annual bonus opportunity) (provided, however,
that, neither a change in your reporting responsibilities nor the termination of any responsibilities you may have relating to the management and operation of a public company shall constitute Good Reason), (B) the Company’s requiring you,
without your prior written consent, to change the office location at which you are based which results in your having a commute to such location from your residence in excess of 75 miles or in excess of 120% (in miles) of your commute immediately
prior to the date of such change of location, whichever is greater, or (C) the Company’s breach of any material terms of your employment or this letter, and, in the case of clause (A) or (C), such reduction or breach is not cured
within 30 days after written notice by you to the Company identifying such reduction or breach. In order to constitute termination for Good Reason, you must terminate your employment within 60 days after the basis for such termination becomes known
to you (or, in the case of clause (A) or (C), within 30 days after the Company has failed to cure such reduction or breach). 

 Annex B -Form of Non-Competition Agreement 
 [Executed Document on file as Exhibit 10.44] 

 Annex C 
 Form of Release of Claims 
 WAIVER AND RELEASE OF CLAIMS 
 1. General Release. In consideration of the payments and benefits to be made under the letter from Deltek Systems, Inc. (the
“Company”) to Carolyn Parent (the “Executive”), dated as of                     , 2006 (the
“Employment Letter”) the Executive, with the intention of binding the Executive and the Executive’s heirs, executors, administrators and assigns, does hereby release, remise, acquit and forever discharge the Company and each of
its subsidiaries and affiliates (the “Company Affiliated Group”), their present and former officers, directors, executives, agents, shareholders, attorneys, employees and employee benefits plans (and the fiduciaries thereof), and
the successors, predecessors and assigns of each of the foregoing (collectively, the “Company Released Parties”), of and from any and all claims, actions, causes of action, complaints, charges, demands, rights, damages, debts, sums
of money, accounts, financial obligations, suits, expenses, attorneys’ fees and liabilities of whatever kind or nature in law, equity or otherwise, whether accrued, absolute, contingent, unliquidated or otherwise and whether now known, unknown,
suspected or unsuspected which the Executive, individually or as a member of a class, now has, owns or holds, or has at any time heretofore had, owned or held, against any Company Released Party (an “Action”) arising out of or in
connection with the Executive’s service as an employee, officer and/or director to any member of the Company Affiliated Group (or the predecessors thereof), including (i) the termination of such service in any such capacity, (ii) for
severance or vacation benefits, unpaid wages, salary or incentive payments, (iii) for breach of contract, wrongful discharge, impairment of economic opportunity, defamation, intentional infliction of emotional harm or other tort and
(iv) for any violation of applicable state and local labor and employment laws (including, without limitation, all laws concerning harassment, discrimination, retaliation and other unlawful or unfair labor and employment practices), any and all
Actions based on the Employee Retirement Income Security Act of 1974 (“ERISA”), and any and all Actions arising under the civil rights laws of any federal, state or local jurisdiction, including, without limitation, Title VII of the
Civil Rights Act of 1964 (“Title VII”), the Americans with Disabilities Act (“ADA”), Sections 503 and 504 of the Rehabilitation Act, the Family and Medical Leave Act and the Age Discrimination in Employment Act
(“ADEA”), excepting only: 
 (a) rights of the Executive under this Waiver and Release of Claims and the Employment Letter;

 (b) rights of the Executive relating to equity awards held by the Executive as of her date of termination; 
 (c) the right of the Executive to receive COBRA continuation coverage in accordance with applicable law and the Employment Letter; 
 (d) rights to indemnification the Executive may have (i) under applicable corporate law, (ii) under the by-laws or certificate of incorporation
of any Company Released Party or (iii) as an insured under any director’s and officer’s liability insurance policy now or 

 
previously in force; 
 (e) claims (i) for
benefits under any health, disability, retirement, deferred compensation, life insurance or other, similar employee benefit plan or arrangement of the Company Affiliated Group and (ii) for earned but unused vacation pay through the date of
termination in accordance with applicable Company policy; and 
 (f) claims for the reimbursement of unreimbursed business expenses incurred
prior to the date of termination pursuant to applicable Company policy. 
 2. No Admissions, Complaints or Other Claims. The Executive
acknowledges and agrees that this Waiver and Release of Claims is not to be construed in any way as an admission of any liability whatsoever by any Company Released Party, any such liability being expressly denied. The Executive also acknowledges
and agrees that she has not, with respect to any transaction or state of facts existing prior to the date hereof, filed any Actions against any Company Released Party with any governmental agency, court or tribunal. 
 3. Application to all Forms of Relief. This Waiver and Release of Claims applies to any relief no matter how called, including, without
limitation, wages, back pay, front pay, compensatory damages, liquidated damages, punitive damages for pain or suffering, costs and attorney’s fees and expenses. 
 4. Specific Waiver. The Executive specifically acknowledges that her acceptance of the terms of this Waiver and Release of Claims is, among other things, a specific waiver of any and all Actions under Title
VII, ADEA, ADA and any state or local law or regulation in respect of discrimination of any kind; provided, however, that nothing herein shall be deemed, nor does anything herein purport, to be a waiver of any right or Action which by
law the Executive is not permitted to waive. 
 5. Voluntariness. The Executive acknowledges and agrees that she is relying solely
upon her own judgment; that the Executive is over eighteen years of age and is legally competent to sign this Waiver and Release of Claims; that the Executive is signing this Waiver and Release of Claims of her own free will; that the Executive has
read and understood the Waiver and Release of Claims before signing it; and that the Executive is signing this Waiver and Release of Claims in exchange for consideration that she believes is satisfactory and adequate. The Executive also acknowledges
and agrees that she has been informed of the right to consult with legal counsel and has been encouraged to do so. 
 6. Complete
Agreement/Severability. This Waiver and Release of Claims constitutes the complete and final agreement between the parties and supersedes and replaces all prior or contemporaneous agreements, negotiations, or discussions relating to the subject
matter of this Waiver and Release of Claims. All provisions and portions of this Waiver and Release of Claims are severable. If any provision or portion of this Waiver and Release of Claims or the application of any provision or portion of the
Waiver and Release of Claims shall be determined to be invalid or unenforceable to any extent or for any reason, all other provisions and portions of this Waiver and Release of Claims shall remain in full force and shall continue to be enforceable
to the fullest and greatest extent permitted by law. 

 7. Acceptance and Revocability. The Executive acknowledges that she has been given a period of 21
days within which to consider this Waiver and Release of Claims, unless applicable law requires a longer period, in which case the Executive shall be advised of such longer period and such longer period shall apply. The Executive may accept this
Waiver and Release of Claims at any time within this period of time by signing the Waiver and Release of Claims and returning it to the Company. This Waiver and Release of Claims shall not become effective or enforceable until seven calendar days
after the Executive signs it. The Executive may revoke her acceptance of this Waiver and Release of Claims at any time within that seven calendar day period by sending written notice to the Company. Such notice must be received by the Company within
the seven calendar day period in order to be effective and, if so received, would void this Waiver and Release of Claims for all purposes. 
 8. Governing Law. Except for issues or matters as to which federal law is applicable, this Waiver and Release of Claims shall be governed by and construed and enforced in accordance with the laws of the Commonwealth of Virginia
without giving effect to the conflicts of law principles thereof. 
  

			
	  
	 	
	Carolyn Parent

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