Document:

<PAGE>

                                                                   EXHIBIT 10.28

April 7, 2004

Mr. Thomas Pianko
[Address]
[Address]

PERSONAL AND CONFIDENTIAL

Dear Tom:

      This letter sets forth the substance of the separation agreement (the
"Agreement") which Vitria Technology. Inc. (the "Company") is offering to you to
aid in your employment transition.

            NOTIFICATION DATE: April 2, 2004

            Prior to the separation date, you will be expected to complete the
            following tasks:

                  -     Transition all marketing responsibilities to Jeff
                        Bairstow - in coordination with Jeff Bairstow

                  -     Complete the performance evaluation process - Deliver
                        all performance reviews

                  -     Complete the salary administration process

            SEPARATION DATE: May 14, 2004

            SEVERANCE PAYMENT:

                  -     20 weeks of pay, subject to standard deductions and
                        withholdings

                  -     Medical, dental and vision benefits through October 31,
                        2004

RETURN DATE: You will have until April 28th, 2004 to accept this
Waiver/Severance Agreement.

In accordance with the Age Discrimination in Employment Act (the "ADEA"), you
have a period of 21 days in which to consider the terms of this Agreement and 7
days, after signing this Agreement, in which you may choose to revoke your
acceptance of its terms. If you exercise this right of revocation, you must put
the revocation in writing and deliver or mail it to the Company within the seven
(7) day revocation period. A mailed revocation must be postmarked within the
seven (7) day revocation period and properly addressed to the Company, to the
attention of the individual who has signed this letter. You are advised to
consult an attorney before waiving any rights that you may have under the ADEA.
Eight (8) days after both parties have signed this Agreement (the "Effective
Date"), its terms will automatically become effective provided that you have
returned the Agreement to the individual who has signed this letter, unless you
have revoked your acceptance of the terms. The Company will mail the severance
payment to you ten (10) business days after the Separation Date.

<PAGE>

      1.    SEPARATION. Your last day of employment with the Company is May 14,
            2004 (the "Separation Date"). On the Separation Date, you will be
            paid all accrued salary, and all accrued and unused vacation earned
            through the Separation Date, subject to standard deductions and
            withholdings. You are entitled to these payments regardless of
            whether you sign this Agreement.

      2.    SEVERANCE. Although the Company has no policy or procedure requiring
            payment of any severance benefits, if you sign this Agreement and
            comply with your obligations herein, the Company will make the
            severance payment as set forth above.

      3.    HEALTH INSURANCE. To the extent provided by the federal COBRA law
            or, if applicable, state insurance laws, and by the Company's
            current group health insurance policies, you will be eligible to
            continue your group health insurance benefits at your own expense.
            Later, you may be able to convert to an individual policy through
            the provider of the Company's health insurance, if you wish.

      4.    OTHER COMPENSATION OR BENEFITS. You acknowledge that, except as
            expressly provided in this Agreement, you will not receive any
            additional compensation, severance or benefits after the Separation
            Date.

      5.    STOCK OPTIONS. You expressly acknowledge and agree that your Company
            stock options cease vesting the day after the Separation Date. You
            must exercise vested shares, pursuant to the terms of Vitria
            Technology, Inc.'s EQUITY INCENTIVE PLAN, within ninety (90) days
            after the Separation Date.

      6.    EXPENSE REIMBURSEMENTS. You agree that within thirty (30) days of
            the Separation Date, you will submit your final documented expense
            reimbursement statement to Human Resources reflecting all business
            expenses you incurred through the Separation Date, if any, for which
            you seek reimbursement. The Company will reimburse you for these
            expenses pursuant to its regular business practice.

      7.    RETURN OF COMPANY PROPERTY. You agree to return to the Company on or
            before the Separation Date or on a date otherwise agreed to in
            writing with the Company, all Company property which you have had in
            your possession at any time, including, but not limited to, Company
            files, notes, drawings, records, business plans and forecasts,
            financial information, specifications, computer-recorded
            information, tangible property (including, but not limited to,
            computers), credit cards, entry cards, identification badges and
            keys; and any materials of any kind which contain or embody any
            proprietary or confidential information of the Company (and all
            reproductions thereof). Failure to return Company property as
            specified herein shall entitle Vitria Technology, Inc. to withhold
            severance benefits pursuant to this Agreement.

<PAGE>

      8.    PROPRIETARY INFORMATION OBLIGATIONS. Both during and after your
            employment you will refrain from any use or disclosure of the
            Company's proprietary or confidential information or materials, and
            you acknowledge that you continue to be bound by the terms of the
            Company's Confidentiality Agreement attached hereto as Exhibit A.

      9.    CONFIDENTIALITY. The provisions of this Agreement shall be held in
            strictest confidence by you and the Company and shall not be
            publicized or disclosed in any manner whatsoever; provided, however,
            that: (a) you may disclose this Agreement to your immediate family;
            (b) the parties may disclose this Agreement in confidence to their
            respective attorneys, accountants, auditors, tax preparers, and
            financial advisors; (c) the Company may disclose this Agreement as
            necessary to fulfill standard or legally required corporate
            reporting or disclosure requirements; and (d) the parties may
            disclose this Agreement insofar as such disclosure may be necessary
            to enforce its terms or as otherwise required by law.

      10.   NONDISPARAGEMENT. You agree that you will not at any time disparage
            the Company or its directors, officers, shareholders, agents, or
            employees in any manner likely to be harmful to the personal or
            business reputation of it or them, and the Company (through its
            officers and directors) agrees that it will not disparage you in any
            manner likely to be harmful to your personal or business reputation,
            provided that both you and the Company shall respond accurately and
            fully to any question, inquiry, or request for information when
            required by legal process.

      11.   RELEASE. In exchange for the consideration provided to you by this
            Agreement that you are not otherwise entitled to receive, you hereby
            generally and completely release the Company and its directors,
            officers, employees, shareholders, partners, agents, attorneys,
            predecessors, successors, parent and subsidiary entities, insurers,
            affiliates, and assigns from any and all claims, liabilities and
            obligations, both known and unknown, that arise out of or are in any
            way related to events, acts, conduct, or omissions occurring prior
            to or on the date you sign this Agreement. This general release
            includes, but is not limited to: (1) all claims arising out of or in
            any way related to your employment with the Company or the
            termination of that employment; (2) all claims related to your
            compensation or benefits from the Company, including salary,
            bonuses, commissions. vacation pay, expense reimbursements,
            severance pay, fringe benefits, stock, stock options, or any other
            ownership interests in the Company; (3) all claims for breach of
            contract, wrongful termination, and breach of the implied covenant
            of good faith and fair dealing; (4) all tort claims, including
            claims for fraud, defamation, emotional distress, and discharge in
            violation of public policy; and (5) all federal, state, and local
            statutory claims, including but not limited to claims for
            discrimination, harassment, retaliation, attorneys` fees, or other
            claims arising under the federal Civil Rights Act of 1964 (as
            amended), the federal Americans with Disabilities Act of 1990, the
            federal Age Discrimination in Employment Act of 1967 (as amended)
            ("ADEA"), and the California Fair Employment and Housing Act (as
            amended).

<PAGE>

      12.   ADEA WAIVER. [FOR EMPLOYEES 40 YEARS OF AGE OR OLDER.] YOU
            ACKNOWLEDGE THAT YOU ARE KNOWINGLY AND VOLUNTARILY WAIVING AND
            RELEASING ANY RIGHTS YOU MAY HAVE UNDER THE ADEA. YOU ALSO
            ACKNOWLEDGE THAT THE CONSIDERATION GIVEN FOR THE WAIVER AND RELEASE
            IN THE PRECEDING PARAGRAPH HEREOF IS IN ADDITION TO ANYTHING OF
            VALUE TO WHICH YOU ARE ALREADY ENTITLED. YOU FURTHER ACKNOWLEDGE
            THAT YOU HAVE BEEN HEREBY ADVISED, AS REQUIRED BY THE ADEA, THAT
            YOUR WAIVER AND RELEASE DO NOT APPLY TO ANY RIGHTS OR CLAIMS THAT
            MAY ARISE AFTER THE EXECUTION DATE OF THIS AGREEMENT.

      13.   SECTION 1542 WAIVER. In giving the releases set forth in this
            Agreement, which includes claims which may be unknown to you at
            present, you acknowledge that you have read and understand Section
            1542 of the California Civil Code which reads as follows. "A GENERAL
            RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR DOES NOT KNOW
            OR SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING THE
            RELEASE, WHICH IF KNOWN BY HIM MUST HAVE MATERIALLY AFFECTED HIS
            SETTLEMENT WITH THE DEBTOR." You hereby expressly waive and
            relinquish all rights and benefits under that Section and any law of
            any jurisdiction of similar effect with respect to your release of
            any unknown or unsuspected claims.

      14.   MISCELLANEOUS. This Agreement, including Exhibit A, constitutes the
            complete, final and exclusive embodiment of the entire agreement
            between you and the Company with regard to this subject matter. It
            is entered into without reliance on any promise or representation,
            written or oral, other than those expressly contained herein, and it
            supersedes any other such promises, warranties or representations.
            This Agreement may not be modified or amended except in writing
            signed by both you and a duly authorized officer of the Company.
            This Agreement shall bind the heirs, personal representatives,
            successors and assigns of both you and the Company, and inure to the
            benefit of both you and the Company, their heirs, successors and
            assigns. If any provision of this Agreement is determined to be
            invalid or unenforceable, in whole or in part, this determination
            will not affect any other provision of this Agreement and the
            provision in question shall be modified by the court so as to be
            rendered enforceable. This Agreement shall be deemed to have been
            entered into and shall be construed and enforced in accordance with
            the laws of the State of California as applied to contracts made and
            to be performed entirely within California.

<PAGE>

If this Agreement is acceptable to you, please sign below and return it to me.

I wish you the best in your future endeavors.

                                              Sincerely,

                                              VITRIA TECHNOLOGY, INC.

                                              By: /s/  Sonja Wilkerson
                                                  ------------------------------
                                                       Sonja Wilkerson
                                                       VP, Human Resources

ACCEPTED AND AGREED:

/s/ Thomas Pianko
----------------------------------
Thomas Pianko

April 7, 2004
Date

<PAGE>

                                    EXHIBIT A

                PROPRIETARY INFORMATION AND INVENTIONS AGREEMENT<PAGE>

                                                                   EXHIBIT 10.29

July 14, 2004

VIA HAND-DELIVERY

Sonja Wilkerson
[Address]
[Address]

Dear Sonja:

This letter sets forth the substance of the separation agreement (the
"Agreement") that Vitria Technology, Inc. (the "Company") is offering to you to
aid in your employment transition. The terms of this Agreement supersede any and
all prior letter agreements executed between you and the Company related to your
separation.

      1.    SEPARATION DATE AND TRANSITION PERIOD. Your last day of employment
with the Company will be August 31, 2004, (the "Separation Date"). During the
period beginning on the date this Agreement becomes effective until the
Separation Date (the "Transition Period"), you will continue to serve as Vice
President of Human Resources of the Company. You will continue to devote your
full work efforts to the Company and will exercise your best professional
efforts to perform your current duties. During the Transition Period, you will
receive your current salary and benefits, your unvested stock options will
continue to vest, and all other terms and conditions of your employment will
apply (including your obligation to abide by Vitria's policies and procedures).
During the Transition Period, you will report to the Company's Chief Financial
Officer and you will personally and directly coordinate employment searches to
fill various executive positions in the Company.

      2.    ACCRUED SALARY AND PAID TIME OFF. On the Separation Date, the
Company will pay you all accrued salary, and all accrued and unused vacation
earned through the Separation Date, subject to standard payroll deductions and
withholdings. You are entitled to these payments by law.

      3.    SEVERANCE PAYMENTS. Although the Company has no obligation to do so,
if you sign this Agreement and allow it to become effective, and if on the
Separation Date you sign the Separation Date Release attached hereto as EXHIBIT
A and allow it to become effective, then within ten (10) business days after the
Separation Date, the Company will pay you, as severance, the equivalent of
twenty-three (23) weeks of your current base salary payable in bi-monthly
installments over a twenty-three (23) week period, subject to standard payroll
deductions and withholdings.

<PAGE>

                                                                   July 14, 2004

      4.    HEALTH INSURANCE. To the extent provided by federal COBRA law and
the Company's current group health insurance policies, you are eligible to
continue your current health insurance benefits at your own expense. Later, you
may be able to convert to an individual policy through the provider of the
Company's health insurance. If you timely elect coverage under COBRA and comply
with all of your obligations under this Agreement, then the Company will pay the
premiums necessary to continue your current health insurance benefits for six
(6) months following the Separation Date.

      5.    STOCK OPTIONS. You expressly acknowledge and agree that your Company
stock options cease vesting the day after the Separation Date. You must exercise
vested options pursuant to the terms of Vitria Technology, Inc.'s Equity
Incentive Plan, within ninety (90) days after the Separation Date.

      6.    OTHER COMPENSATION OR BENEFITS. You acknowledge that, except as
expressly provided in this Agreement, you will not receive any additional
compensation, severance or benefits after the Separation Date, with the sole
exception of any benefit the right to which has vested under the express terms
of a Company benefit plan document.

      7.    EXPENSE REIMBURSEMENTS. You agree that, within thirty (30) days of
the Separation Date, you will submit a documented expense reimbursement
statement reflecting all business expenses you incurred through the Separation
Date, if any, for which you seek reimbursement. The Company will reimburse you
for these expenses pursuant to its regular business practice.

      8.    RETURN OF COMPANY PROPERTY. By the Separation Date, you must return
to the Company all Company documents (and all copies thereof) and other Company
property in your possession or control, including, but not limited to: Company
files, notes, memoranda, correspondence, agreements, draft documents, notebooks,
logs, drawings, records, plans, proposals, reports, forecasts, financial
information, sales and marketing information, research and development
information, personnel information, specifications, computer-recorded
information, tangible property and equipment, credit cards, entry cards,
identification badges and keys; and any materials of any kind that contain or
embody any proprietary or confidential information of the Company (and all
reproductions thereof in whole or in part). You agree to make a diligent search
for any Company documents and property (as described above) in your possession
or control prior to the Effective Date.

      9.    PROPRIETARY INFORMATION OBLIGATIONS. You acknowledge your continuing
obligations under your Proprietary Information and Inventions Agreement, a copy
of which is attached hereto as EXHIBIT B.

      10.   CONFIDENTIALITY. The provisions of this Agreement will be held in
strictest confidence by you and the Company and will not be publicized or
disclosed in any manner whatsoever; provided, however, that: (a) you may
disclose this Agreement to your immediate family; (b) the parties may disclose
this Agreement in confidence to their respective attorneys, accountants,
auditors, tax preparers, and financial advisors; (c) the Company may disclose
this Agreement as necessary to fulfill standard or legally required corporate
reporting or disclosure

                                       2
<PAGE>

                                                                   July 14, 2004

requirements; and (d) the parties may disclose this Agreement insofar as such
disclosure may be necessary to enforce its terms or as otherwise required by
law.

      11.   NONDISPARAGEMENT. Both you and the Company (through its directors
and officers) agree not to disparage the other party, and the other party's
officers, directors, employees, shareholders and agents, in any manner likely to
be harmful to them or their business, business reputation or personal
reputation; provided that both you and the Company may respond accurately and
fully to any question, inquiry or request for information when required by legal
process. You also agree that you will not voluntarily assist any person in
bringing or pursuing legal action against the Company, its agents, successors,
representatives, employees and related and/or affiliated companies based on
events occurring prior to the Separation Date.

      12.   RELEASE. In exchange for the severance benefits set forth in
Sections 3 and 4, and other benefits you are receiving under the terms of this
Agreement to which you would not otherwise be entitled, you hereby generally and
completely release the Company and its directors, officers, employees,
shareholders, partners, agents, attorneys, predecessors, successors, parent or
subsidiary entities, insurers, affiliates and assigns from any and all claims,
liabilities and obligations, both known and unknown, that arise out of or are in
any way related to events, acts, conduct, or omissions prior to or on the date
you sign this Agreement. This general release includes, but is not limited to:
(1) all claims arising out of or in any way related to your employment with the
Company or the termination of that employment; (2) all claims related to your
compensation or benefits from the Company, including salary, bonuses,
commissions, vacation pay, expense reimbursements, severance pay, fringe
benefits, stock, stock options or any other ownership interests in the Company;
(3) all claims for breach of contract, wrongful termination or breach of the
implied covenant of good faith and fair dealing; (4) all tort claims, including
claims for fraud, defamation, emotional distress and discharge in violation of
public policy; and (5) all federal, state, and local statutory claims, including
claims for discrimination, harassment, retaliation, attorneys' fees, or other
claims arising under the federal Civil Rights Act of 1964 (as amended), the
federal Americans with Disabilities Act of 1990, the federal Age Discrimination
in Employment Act of 1967 (as amended) ("ADEA"), the California Fair Employment
and Housing Act, and the California Labor Code.

      13.   WAIVER OF UNKNOWN CLAIMS. In giving this release, which includes
claims that may be unknown to you at present, you acknowledge that you have read
and understand Section 1542 of the California Civil Code which reads as follows:
"A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR DOES NOT KNOW OR
SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING THE RELEASE, WHICH IF
KNOWN BY HIM MUST HAVE MATERIALLY AFFECTED HIS SETTLEMENT WITH THE DEBTOR." You
expressly waive and relinquish all rights and benefits under that section and
any law of any jurisdiction of similar effect with respect to your release of
claims herein.

      14.   ADEA WAIVER. You hereby acknowledge that you are knowingly and
voluntarily waiving and releasing any rights you may have under the ADEA, and
that the consideration given for the foregoing waiver is in addition to anything
of value to which you were already entitled. You have been advised by this
writing, as required by the ADEA that: (a) your waiver and release do not apply
to any claims that may arise after your signing of this Agreement; (b) you
should consult with an attorney prior to executing this release; (c) you have
twenty-one (21) days within which to

                                       3
<PAGE>

                                                                   July 14, 2004

consider this release (although you may choose to voluntarily execute this
release earlier); (d) you have seven (7) days following the execution of this
release to revoke the Agreement; and (e) this Agreement will not be effective
until the eighth day after this Agreement has been signed both by you and by the
Company ("Effective Date").

      15.   MISCELLANEOUS. This Agreement, together with EXHIBITS A AND B,
constitutes the complete, final and exclusive embodiment of the entire agreement
between you and the Company with regard to this subject matter. It is entered
into without reliance on any promise or representation, written or oral, other
than those expressly contained herein, and it supersedes any other such promises
or representations. This Agreement may not be modified or amended except in a
writing signed by both you and a duly authorized officer of the Company. This
Agreement will bind the heirs, personal representatives, successors and assigns
of both you and the Company, and inure to the benefit of both you and the
Company, their heirs, successors and assigns. The failure to enforce any breach
of this Agreement shall not be deemed to be a waiver of any other or subsequent
breach. For purposes of construing this Agreement, any ambiguities shall not be
construed against either party as the drafter. If any provision of this
Agreement is determined to be invalid or unenforceable, in whole or in part,
this determination will not affect any other provision of this Agreement and the
provision in question will be modified by the court so as to be rendered
enforceable in a manner consistent with the intent of the parties insofar as
possible. This Agreement will be deemed to have been entered into and will be
construed and enforced in accordance with the laws of the State of California as
applied to contracts made and to be performed entirely within California. This
Agreement may be executed in counterparts which shall be deemed to be part of
one original, and facsimile signatures shall be equivalent to original
signatures.

                                       4
<PAGE>

                                                                   July 14, 2004

If this Agreement is acceptable to you, please sign below and return the
original to me.

I wish you the best in your future endeavors.

Sincerely,

VITRIA TECHNOLOGY, INC.

By: /s/ Dale Skeen
    ---------------------------------
        Dale Skeen
        Chief Executive Officer

AGREED:

/s/ Sonja Wilkerson
-------------------------------------
Sonja Wilkerson

Exhibit A:        Separation Date Release

Exhibit B:        Proprietary Information and Inventions Agreement

                                       5
<PAGE>
                                                                   July 14, 2004

                                    EXHIBIT A

                             SEPARATION DATE RELEASE

I understand that, pursuant to the separation letter agreement between me and
Vitria Technology, Inc. (the "Company"), which I signed on
________________________, 2004 (the "Agreement"), I am required to sign this
Separation Date Release ("Release") as a condition for receiving the severance
benefits set forth in paragraphs 3 and 4 of the Agreement. I further understand
that, regardless of whether I sign this Release, the Company will pay me all
accrued salary and vacation earned through my Separation Date, to which I am
entitled by law.

I hereby generally and completely release the Company and its directors,
officers, employees, shareholders, partners, agents, attorneys, predecessors,
successors, parent or subsidiary entities, insurers, affiliates and assigns from
any and all claims, liabilities and obligations, both known and unknown, that
arise out of or are in any way related to events, acts, conduct, or omissions
prior to or on the date I sign this Agreement. This general release includes,
but is not limited to: (1) all claims arising out of or in any way related to my
employment with the Company or the termination of that employment; (2) all
claims related to my compensation or benefits from the Company, including
salary, bonuses, commissions, vacation pay, expense reimbursements, severance
pay, fringe benefits, stock, stock options or any other ownership interests in
the Company; (3) all claims for breach of contract, wrongful termination or
breach of the implied covenant of good faith and fair dealing; (4) all tort
claims, including claims for fraud, defamation, emotional distress and discharge
in violation of public policy; and (5) all federal, state, and local statutory
claims, including claims for discrimination, harassment, retaliation, attorneys'
fees, or other claims arising under the federal Civil Rights Act of 1964 (as
amended), the federal Americans with Disabilities Act of 1990, the federal Age
Discrimination in Employment Act of 1967 (as amended) ("ADEA"), or the
California Fair Employment and Housing Act (as amended).

I hereby acknowledge that I am knowingly and voluntarily waiving and releasing
any rights I may have under the ADEA, and that the consideration given for the
foregoing waiver is in addition to anything of value to which I was already
entitled. I have been advised by this writing, as required by the ADEA that: (a)
my waiver and release do not apply to any claims that may arise after my signing
of this Agreement; (b) I should consult with an attorney prior to executing this
release; (c) I have twenty-one (21) days within which to consider this release
(although I may choose to voluntarily execute this release earlier); (d) I have
seven (7) days following the execution of this release to revoke the Agreement;
and (e) this Agreement will not be effective until the eighth day after this
Agreement has been signed both by me and by the Company.

I UNDERSTAND THAT THIS AGREEMENT INCLUDES A RELEASE OF ALL KNOWN AND UNKNOWN
CLAIMS. In giving this release, which includes claims that may be unknown to me
at present, I acknowledge that I have read and understand Section 1542 of the
California Civil Code

                                       6
<PAGE>

                                                                   July 14, 2004

which reads as follows: "A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE
CREDITOR DOES NOT KNOW OR SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING
THE RELEASE, WHICH IF KNOWN BY HIM MUST HAVE MATERIALLY AFFECTED HIS SETTLEMENT
WITH THE DEBTOR." I expressly waive and relinquish all rights and benefits under
that section and any law of any jurisdiction of similar effect with respect to
my release of any unknown or unsuspected claims I may have against the Company.

HAVING READ AND UNDERSTOOD THE FOREGOING, I HEREBY AGREE TO THE TERMS AND
CONDITIONS STATED ABOVE.

______________________________              ______________________________, 2004
Sonja Wilkerson                                   Date

                                       7
<PAGE>

                                                                   July 14, 2004

                                    EXHIBIT B

                PROPRIETARY INFORMATION AND INVENTIONS AGREEMENT

                                       8

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