Document:

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                                                                   EXHIBIT 10.10

October 3, 2003

Mr. Mark Schrandt

Dear Mark:

     It gives me great pleasure to offer you the position of Vice President of
Engineering for Isilon Systems, Inc. ("Isilon" or the "Company"). We believe
that you will add substantially to the team and contribute greatly to the
ultimate success of the Company by providing Isilon with the same extraordinary
engineering leadership that you have demonstrated throughout your career. The
Board of Directors, the existing Isilon team and I look forward to you joining
the Company and helping us build Isilon into one of the most important companies
driving the next generation of storage solutions.

     We understand and appreciate the nature of the commitment you are making to
join Isilon, and we want you to do so with great confidence. You have the
qualities that distinguish successful executives: leadership, high integrity,
intelligence, action-oriented, and a desire to make a difference. We are
extremely enthusiastic about your accepting this offer.

     The Company is pleased to offer you employment on the following terms:

POSITION

     You will become Vice President of Engineering of the Company, working out
of the Company's headquarters office in Seattle, Washington. You will report to
the President and Chief Executive Officer. By signing this letter agreement, you
confirm to the Company that you have no contractual commitments or other legal
obligations that would prohibit you from performing your duties for the Company.

START DATE

     Subject to fulfillment of any condition imposed by this letter agreement,
you will begin this new position with the Company at a mutually agreed upon
date. The Company would like you to begin your employment at Isilon no later
than November 17th, 2003, or earlier if possible.

PROOF OF RIGHT TO WORK

     This offer of employment is contingent upon you presenting, in accordance
with applicable law, verification of your identity and your legal right to work
in the United States. In the event that you do not possess, or are unable to
obtain authorization to accept employment in the United States, our offer of
employment is withdrawn.

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COMPENSATION

     -    BASE SALARY. You will be paid a monthly salary of $14,583.33, which is
          equivalent to $175,000 on an annual basis. Your salary will be payable
          in twenty-six equal payments, one payment every two weeks, pursuant to
          the Company's regular payroll policy and will be subject to applicable
          withholding taxes.

     -    TRAVEL BUDGET. You will be granted a travel budget of up to $15,000 to
          cover travel expenses to and from Minnesota and Washington State for
          you and your family for the period from your Start Date until your
          family has relocated to Seattle. These expenses must be allowable
          expenses in line with the Company's Travel and Entertainment Policy. A
          copy of the Company's Travel and Entertainment Policy is enclosed for
          your review. Travel expenses for your family may be considered taxable
          income to you. To the extent it is taxable income, applicable payroll
          taxes will be withheld in accordance with IRS regulations.

     -    HOUSING BUDGET. The company will cover rental costs for an apartment
          in the Queen Anne area of Seattle, WA up to a maximum of $2,000 per
          month. The housing allowance will begin the first month of your
          employment with the Company and will be paid through the month in
          which your family relocates to Seattle, or July 2004, whichever date
          is sooner.

     -    RELOCATION BUDGET. The company will cover the cost of moving your
          household goods from Minnesota to Seattle, WA, not to exceed a
          mutually agreed upon budget amount.

STOCK OPTIONS

     -    INITIAL OPTION GRANT. In connection with the commencement of your
          employment, the Company will recommend that the Board of Directors
          grant you an option to purchase 894,200 shares (approximately 1.25% of
          the fully-diluted shares) of the Company's Common Stock with an
          exercise price equal to the fair market value on the date of the
          grant. These option shares will vest at the rate of 25% of the shares
          on the twelve (12) month anniversary of your Vesting Commencement Date
          (which will be the date your full-time employment with the Company
          commences) and the remaining shares will vest monthly thereafter at
          the rate of 1/48 of the total number of shares per month. Vesting
          will, of course, depend on your continued employment with the Company.
          The option will be an incentive stock option to the maximum extent
          allowed by the tax code and will be subject to the terms of the
          Company's 2001 Stock Option Plan and the Stock Option Agreement
          between you and the Company.

     -    EARLY EXERCISE PROVISION. In connection with the commencement of your
          employment, the Company will recommend that the Board of Directors
          offer you the option of exercising your "Initial Option Grant" and
          "Equity Bonus Grant", as described herein, within 45 days of your
          option grant being approved by the Company's Board of Directors.
          Should you choose this early exercise elective:

                                       -2-

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               -    You will be required to pay the full cost of exercising your
                    options, to the Company, within 45 days of your option grant
                    being approved by the Company's Board of Directors.

               -    Initially all of your exercised shares will be subject to
                    being repurchased by the company should your employment with
                    the company be terminated for any reason. On the twelve (12)
                    month anniversary of your Vesting Commencement Date (which
                    will be the date your full-lime employment with the company
                    commences), 25% of your shares will be released from this
                    repurchase agreement and the remaining shares will be
                    released from this repurchase agreement at the rate of 1/48
                    of the total number of shares per month. Release of shares
                    from this repurchase agreement will, of course, depend on
                    your continued employment with the Company. Should the
                    Company exercise its option to repurchase your shares, the
                    Company will repurchase them a price equivalent to your
                    original price per share.

               -    The early exercise agreement will impose restrictions on
                    unvested shares, including, but not limited to, limitations
                    on transfer, voting privileges, and escrow of unvested
                    shares.

     -    EQUITY BONUS. Once your family has completed their relocation to
          Seattle, WA, the Company will recommend that the Board of Directors
          grant you an option to purchase 429,200 shares (approximately .6% of
          the current fully-diluted shares) of the Company's Common Stock, which
          shall be subject to the Plan. Such option will have an exercise price
          equal to the "Initial Option Grant" on the date of the approval of
          such grant by the Board and shall vest monthly over four years from
          your Start Date.

     -    SUBSEQUENT OPTION GRANTS. At the discretion of the Company's Board of
          Directors, you may be eligible to receive additional grants of stock
          options or purchase rights from time to time in the future, on such
          terms and subject to such conditions as the Board of Directors shall
          determine as of the date of such grant.

BENEFITS

     -    INSURANCE BENEFITS. The Company will provide you with standard medical
          and dental insurance benefits according to Company policy.

     -    VACATION. You will be entitled to vacation according to Company
          policy.

SEVERENCE BENEFITS

     If the company terminates your employment for any reason other than for
Cause, or you resign all of your positions with the Company for Good Reason, you
will be entitled to receive a continuation of your then current base or $87,500
on an annualized basis, whichever is higher, and reimbursement of COBRA payments
for a period of six (6) months (the "Severance Period"), paid in accordance with
the Company's normal payroll practices. To the extent that you receive cash

                                       -3-

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compensation and/or obtain health benefits from another employer or pursuant to
a consulting relationship during the Severance Period, payments hereunder shall
be reduced by the amount of such cash compensation and, if applicable,
reimbursement of health benefits will cease. You agree that you will notify the
Company of your obtaining employment or a consulting agreement, and the terms
thereof, during the Severance Period. You will not be entitled to any additional
payments, salary, bonus or benefits in the event of termination for Cause.

PROPRIETARY INFORMATION AND INVENTIONS AGREEMENT

     Your acceptance of this offer and commencement of employment with the
Company is contingent upon the execution, and delivery to an officer of the
Company, of the Company's Proprietary Information and Invention Assignment
Agreement, a copy of which is enclosed for your review and execution (the
"Assignment Agreement"), prior to or on your Start Date.

AT-WILL EMPLOYMENT

     Your employment with the Company will be on an "at will" basis, meaning
that either you or the Company may terminate your employment at any time for any
reason or no reason, without further obligation or liability.

REFERENCE CHECKS

     This offer of employment is contingent upon satisfactory reference checks,
to be conducted by Isilon.

ACCEPTANCE

     We are all delighted to be able to extend you this offer and look forward
to working with you. To indicate your acceptance of the Company's offer, please
sign and date this letter in the space provided below and return it to me, along
with a signed and dated copy of the Assignment Agreement, on or before Monday,
October 6, 2002 at 12:00 pm PST.

     This letter, together with the Assignment Agreement, set forth the terms of
your employment with the Company and supersedes any prior representations or
agreements, whether written or oral. This letter may not be modified or amended
except by a written agreement, signed by the Company and by you.

                            [SIGNATURE PAGE FOLLOWS]

                                       -4-

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                                        Very truly yours,

                                        ISILON SYSTEMS, INC.

                                        By: /s/ Steve Goldman
                                            ------------------------------------
                                            Steve Goldman
                                            President and CEO

ACCEPTED AND AGREED:

MARK SCHRANDT

/s/ Mark Schrandt
-------------------------------------
Signature

3-Oct-03
Date

Enclosure A: Proprietary Information and Invention Assignment Agreement
Enclosure B: Isilon Systems' Travel and Entertainment Policy

                                       -5-<PAGE>

                                                                   EXHIBIT 10.11

March 10, 2002

Brett Goodwin

Dear Brett:

     On behalf of Isilon Systems, Inc., (the "Company"). I am pleased to offer
you a full time position with the Company. Speaking for myself, as well as the
other members of the Company's management team and board of directors, we are
all very impressed with your credentials and we look forward to your future
success in this position,

     Your opportunity with the Company is described below:

POSITION

     You will become Vice President of Business Development of the Company,
working out of the Company's headquarters office in Seattle, Washington. As VP
of Business Development, you will report to the Company's Chief Executive
Officer.

START DATE

     Subject to fulfillment of any condition imposed by this letter agreement,
you will begin this new position with the company no later than March 27, 2002.

PROOF OF RIGHT TO WORK

     This offer of employment is contingent upon you presenting, in accordance
with applicable law, verification of your identity and your legal right to work
in the United States. In the event that you do not possess, or are unable to
obtain authorization to accept employment in the United States, our offer of
employment is withdrawn.

COMPENSATION

     -    BASE SALARY. You will be paid a monthly salary of $10,000, which is
          equivalent to $120,000 on an annual basis. Your salary will be payable
          in twenty-six equal payments, one payment every two weeks, pursuant to
          the Company's regular payroll policy and will be subject to applicable
          withholding taxes.

     -    BONUS. You may be paid a performance bonus upon the closing of
          Isilon's Series B financing. If Isilon closes this financing at or
          below a pre-money valuation of $16M you will earn no bonus. If the
          financing closes above $16M pre-money, but below $20M pre-money, you
          will earn $5,000 bonus. If the financing closes above $20M pre-money,
          you will earn a $10,000 bonus. One exception to the structure laid out
          above is: if for any

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          reason the Series B financing is not closed by December 31, 2002, you
          will earn no bonus.

     -    ANNUAL REVIEW. Your base salary will be reviewed annually, as part of
          the Company's normal salary review process.

STOCK OPTIONS

     -    INITIAL OPTION GRANT. In connection with the commencement of your
          employment, the Company will recommend that the Board of Directors
          grant you an option to purchase 380,000 shares of the Company's Common
          Stock with an exercise price equal to the fair market value on the
          date of the grant. These option shares will vest at the rate of 25% of
          the shares on the twelve (12) month anniversary of your Vesting
          Commencement Date (which will be the date your full-time employment
          with the Company commences) and the remaining shares will vest monthly
          thereafter at the rate of 1/48 of the total number of shares per
          month. Vesting will, of course, depend on your continued employment
          with the Company. The option will be an incentive stock option to the
          maximum extent allowed by the tax code and will be subject to the
          terms of the Company's 2001 Stock Option Plan and the Stock Option
          Agreement between you and the Company.

     -    INITIAL OPTION, EXERCISE PRICE PROTECTIVE PROVISION. In the event that
          the fair market value (FMW) on the date of the grant is higher than
          $0.05, the company will grant your "Initial Option Grant" below FMV,
          at $0.05.

     -    EARLY EXERCISE PROVISION. In recognition of risks associated with
          joining a startup at an early stage, the Company will recommend that
          the Board of Directors offer you the option of exercising your
          "Initial Option Grant", as described above, within 15 days of your
          option grant being approved by the Company's Board of Directors.
          Should you choose this early exercise elective:

          -    You will be required to pay the full cost of exercising your
               options, to the Company, within 15 days of your option grant
               being approved by the Company's Board of Directors

          -    Initially all of your exercised shares will be subject to being
               repurchased by the company should your employment with the
               company be terminated for any reason. On the twelve (12) month
               anniversary of your Vesting Commencement Date (which will be the
               date your full-time employment with the company commences), 25%
               of your shares will be released from this repurchase agreement
               and the remaining shares will be released from this repurchase
               agreement at the rate of 1/48 of the total number of shares per
               month. Release of shares from this repurchase agreement will, of
               course, depend on your continued employment with the Company.
               Should the Company exercise its option to repurchase your shares,
               the Company will repurchase them a price equivalent to your
               original price per share.

                                       -2-

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          -    The early exercise agreement will impose restrictions on unvested
               shares, including, but not limited to, limitations on transfer,
               voting privileges, and escrow of unvested shares.

     -    OPTION BONUS. You may be paid a performance-based option bonus upon
          the closing of Isilon's Series B financing. If Isilon closes this
          financing at or below a pre-money valuation of $16M you will earn no
          option bonus. If the financing closes above $16M pre-money, but below
          $20M pre-money, you will earn a 10,000 share option bonus. If the
          financing closes above $20M pre-money, you will earn a 20,000 share
          option bonus. One exception to the structure laid out above is: if for
          any reason the Series B financing is not closed by December 31, 2002,
          you will earn no bonus. These option bonus shares will be subject to
          all limitations & provisions described in "Initial Option Grant".
          These options may have a higher exercise price than the shares granted
          by the "Initial Option Grant". You may exercise these shares early, as
          described in the above section, "Early Exercise Provision".

     -    SUBSEQUENT OPTION GRANTS. At the discretion of the Company's Board of
          Directors, you may be eligible to receive additional grants of stock
          options or purchase rights from time to time in the future, on such
          terms and subject to such conditions as the Board of Directors shall
          determine as of the date of such grant.

BENEFITS

     -    INSURANCE BENEFITS. The Company will provide you with standard medical
          and dental insurance benefits according to Company policy.

     -    VACATION. You will be entitled to vacation according to Company
          policy.

PROPRIETARY INFORMATION AND INVENTIONS AGREEMENT

     Your acceptance of this offer and commencement of employment with the
Company is contingent upon the execution, and delivery to an officer of the
Company, of the Company's Proprietary Information and Invention Assignment
Agreement, a copy of which is enclosed for your review and execution (the
"Assignment Agreement"), prior to or on your Start Date.

AT-WILL EMPLOYMENT

     Your employment with the Company will be on an "at will" basis, meaning
that either you or the Company may terminate your employment at any time for any
reason or no reason, without further obligation or liability.

PRESS RELEASE

     Isilon will mention in a press release that you have joined the company.
This press release will be at or near the time we announce the CEO, or at an
earlier time which the company deems suitable.

                                       -3-

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REFERENCE CHECKS

     This offer of employment is contingent upon satisfactory reference checks,
to be conducted by Isilon.

ACCEPTANCE

     We are all delighted to be able to extend you this offer and look forward
to working with you. To indicate your acceptance of the Company's offer, please
sign and date this letter in the space provided below and return it to me, along
with a signed and dated copy of the Assignment Agreement, on or before March 12,
2002.

     This letter, together with the Assignment Agreement, set forth the terms of
your employment with the Company and supersedes any prior representations or
agreements, whether written or oral. This letter may not be modified or amended
except by a written agreement, signed by the Company and by you. This letter
supercedes the offer letter dated March 6, 2002.

                            [SIGNATURE PAGE FOLLOWS]

                                       -4-

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                                        Very truly yours,

                                        ISILON SYSTEMS, INC.

                                        By: /s/ Sujal Patel
                                            ------------------------------------
                                        Title: Chief Executive Officer

ACCEPTED AND AGREED:

BRETT GOODWIN

/s/ Brett Goodwin
-------------------------------------
Signature

3/11/02
Date

Enclosure A: Proprietary Information and Invention Assignment Agreement

                                       -5-

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