Second Amended and Restated Offer Letter, dated December 20, 2021, by and between the Registrant and Dev Ittycheria

As you know, you are currently employed by MongoDB, Inc. (the “Company”) as its President and Chief Executive Officer pursuant to the terms of an amended and restated offer letter from the Company dated September 29, 2017 (the “Offer Letter”). As discussed, you and the Company hereby agree to further amend and restate the Offer Letter. The terms and conditions set forth in this offer letter agreement (the “Agreement”) will become effective as of the date hereof and will supersede and replace the terms and conditions set forth in the Offer Letter.

In your position as President and Chief Executive Officer, you will continue to be based in our New York office reporting to the Company’s Board of Directors (the “Board”).

You will remain employed as a full-time salaried employee, compensated at the rate of $16,666.67 per semi-monthly pay period ($400,000 annually). Currently, the Company’s regular pay dates are the 15th and last day of each calendar month. If a pay date falls on a weekend or Federal/bank holiday, then the pay date will be on the previous business day. Said salary will be paid in accordance with the Company’s normal payroll practices as may exist from time to time and is subject to required and voluntary withholdings.

In addition to your base salary, during your employment as President and Chief Executive Officer, you will continue to be eligible for an annual bonus with a target of $280,000 per annum paid semi-annually, and which will be based on achievement of Company performance goals to be determined by the Company in its sole discretion. Bonus is subject to required and voluntary withholdings and paid according to Company payroll practices. You must be employed on the bonus payment date to be eligible for the bonus payment, except as otherwise provided below.

You have previously been granted certain stock options and restricted stock units, which will continue to be governed by the terms of the applicable equity incentive plan and award agreements, including, in particular, the Amendment to Notice of Stock Option Grant, dated April 13, 2016, between you and the Company. Eligibility for any future equity awards will be subject to the discretion of the Board.

Except as provided below, if you resign or the Company terminates your employment, or upon your death or disability, then (i) you will no longer vest in any equity awards, (ii) all payments of compensation by the Company to you hereunder will terminate immediately (except as to amounts already earned), and (iii) you will not be entitled to any severance benefits. In addition, you will resign from all positions and terminate any relationships as an employee, advisor, officer or director with the Company and any of its affiliates, each effective on the date of termination.

In the event your employment with the Company is terminated by the Company without Cause (and other than as result of death or disability) or due to your resignation for Good Reason (collectively, an “Involuntary Termination”), then provided such Involuntary Termination constitutes a “separation from service” (as defined under Treasury Regulation Section 1.409A-1(h), without regard to any alternative definition thereunder, a “Separation from Service”), and provided that you remain in compliance with the terms of this Agreement, the Company will provide you with the following severance benefits (collectively, the “Severance Benefits”): (a) an amount equal to twelve (12) months of your then-current base salary to be paid in equal installments on the Company’s normal payroll schedule over the

twelve (12) month period immediately following the date of Separation from Service; and (b) provided that you timely elect continued coverage under COBRA, the Company will pay your COBRA premiums to continue your coverage (including coverage for eligible dependents, if applicable) (“COBRA Premiums”) through the period (the “COBRA Premium Period”) starting on your Separation from Service date and ending on the earliest to occur of: (i) twelve (12) months following your Separation from Service; (ii) the date you become eligible for group health insurance coverage through a new employer; or (iii) the date you cease to be eligible for COBRA continuation coverage for any reason, including plan termination. In the event you become covered under another employer's group health plan or otherwise cease to be eligible for COBRA during the COBRA Premium Period, you must immediately notify the Company of such event. Notwithstanding the foregoing, if the Company determines, in its sole discretion, that it cannot pay the COBRA Premiums without a substantial risk of violating applicable law (including, without limitation, Section 2716 of the Public Health Service Act), the Company will in lieu thereof provide to you a taxable monthly payment in an amount equal to the monthly COBRA premium that you would be required to pay to continue your group health coverage in effect on the date of your employment termination (which amount will be based on the premium for the first month of COBRA coverage), which payments will be made on the last day of each month regardless of whether you elect COBRA continuation coverage and will end on the earlier of (x) the date upon which you obtain other employment or (y) the last day of the 12th calendar month following your Separation from Service date.

If your Involuntary Termination occurs either in connection with a Change in Control (as defined in the Company’s 2016 Equity Incentive Plan), or within 3 months prior to or within twelve (12) months following the closing of a Change in Control, and such termination qualifies as a Separation from Service, and provided that you remain in compliance with the terms of this Agreement, then you will be entitled to the Severance Benefits provided for above, and the following additional benefits: (a) an amount equal to twelve (12) months of your then-current “cash eligible” annual target bonus to be paid in equal installments on the Company’s normal payroll schedule over the twelve (12) month period immediately following the date of Separation from Service, which, for the avoidance of doubt, shall be in addition to payment of (i) any earned but unpaid annual bonus for the fiscal year preceding the fiscal year in which such Separation from Service occurs based on actual performance, as determined by the Compensation Committee and (ii) an annual bonus for the fiscal year in which the Separation from Service occurs, prorated to your date of Separation from Service and determined based on the greater of target performance or actual performance as of your date of Separation from Service, as determined by the Compensation Committee; (b) 100% of all of your then-outstanding time-based unvested Company equity awards will accelerate and will be deemed vested and exercisable (if applicable) as of your date of Separation from Service; and (c) 100% of all of your then-outstanding performance-based unvested Company equity awards will accelerate and will be deemed vested and exercisable (if applicable) based on the greater of your target performance rate or actual performance as of your date of Separation from Service (collectively, the “Change in Control Severance Benefits”), including any performance-based unvested awards granted pursuant to the Company’s Senior Leadership Equity Bonus Program (or similar annual bonus program that may be adopted in the future) (an “Equity Bonus Program”). For the avoidance of doubt, if you have elected to receive your annual bonus in equity in lieu of cash pursuant to an Equity Bonus Program, and have received an equity grant as a result of this election, your annual bonus for the performance period for which you made the election will no longer be considered “cash-eligible” for purposes of subsection (a) of this paragraph; provided however, that for any period for which you have elected to receive your annual bonus in equity in lieu of cash pursuant to an Equity Bonus Program, and for which the Company has not yet granted an equity award to you as of the date of Separation of Service, then such election shall be void, and your annual bonus for such period shall be “cash-eligible” in accordance with subsection (a) of this paragraph.

The receipt of the Severance Benefits or the Change in Control Severance Benefits, as applicable, provided above will be subject to you signing and not revoking a separation agreement and release of claims in a form similar to that attached hereto as Exhibit A (as amended to reflect the reason for the separation and any changes to the law) (the “Separation Agreement”) within the time period set forth therein, which will not exceed 50 days from the date of your Separation from Service (the “Release Period”). No Severance Benefits or Change in Control Severance Benefits, as applicable, will be paid or provided until the Separation Agreement becomes effective. If the Release Period described in the preceding sentence spans two calendar years, then payment of the Severance Benefits or the Change in Control Severance Benefits, as applicable, will in any event commence in the second calendar year. You will also resign from all positions and terminate any relationships as an employee, advisor, officer or director with the Company and any of its affiliates, each effective on the date of termination.

For purposes of this Agreement, “Cause” will mean termination based upon (i) your willful failure to follow lawful directions communicated to you by the Board or otherwise to perform your duties to the Company; (ii) the willful or intentional engaging by you in conduct which is injurious to the Company or its reputation, business or business relationships, monetarily or otherwise; (iii) your commission of an act of fraud, misappropriation or embezzlement with respect to the Company or the Company's business; (iv) your conviction of, or a plea of guilty or nolo contendere to, a felony or a crime of moral turpitude (meaning an extreme departure from ordinary standards of honesty, good morals, justice or ethics as to be shocking in the moral sense of community); (v) your habitual drunkenness or use of illegal substances; (vi) a material breach by you of your obligations under this Agreement, including (without limitation) your obligations specified in your Employee Invention Assignment Agreement, Confidentiality and Arbitration Agreement that is not cured (to the extent curable) within 15 days of the Company providing written notice of such material breach; or (vii) your commission of an act of gross neglect or gross misconduct in connection with the performance of your duties.

For purposes of this Agreement, “Good Reason” means the occurrence of one of the following events without your written consent: (i) a material diminution by the Company in your title or the nature or scope of your responsibilities, duties or authority with the Company, it being specified that no longer holding the office of Chief Executive Officer of a publicly traded company will be considered a material diminution in responsibilities under this clause (i), (ii) a material reduction of your base salary, (iii) a relocation of your principal place of employment that increases your one-way commute by more than 50 miles as compared to your then-current principal place of employment prior to such relocation (it being understood that you are expected to spend material amounts of time in the Company’s other offices as part of your duties hereunder), or (iv) failure by the Company to ensure that a successor entity assumes this Agreement; provided, however, that to resign for Good Reason, you must (1) provide written notice to the Company’s General Counsel within 30 days after the first occurrence of the event giving rise to Good Reason setting forth the basis for your resignation, (2) allow the Company at least 30 days from receipt of such written notice to cure such event, and (3) if such event is not reasonably cured with such period, your resignation from all positions you then hold with the Company is effective not later than 60 days after the expiration of the cure period.

As a regular full-time employee, you will continue to be eligible to participate in Company-sponsored medical, dental, vision, life insurance, short and long-term disability plans. The Company may discontinue or modify any such plans, programs or practices at any time, with or without notice.

If any payment or benefit (including payments and benefits pursuant to this Agreement) that you would receive from the Company or otherwise in connection with a Change in Control (the “Transaction Payment”) would (i) constitute a “parachute payment” within the meaning of Section 280G of the Internal Revenue Code of 1986, as amended (the “Code”) and (ii) but for this sentence, be subject to the excise tax imposed by Section 4999 of the Code (the “Excise Tax”), then the Company will cause to be determined, before any amounts of the Transaction Payment are paid to you, which of the following two alternative forms of payment would result in your receipt, on an after-tax basis, of the greater amount of the Transaction Payment notwithstanding that all or some portion of the Transaction Payment may be subject to the Excise Tax: (1) payment in full of the entire amount of the Transaction Payment (a “Full Payment”), or (2) payment of only a part of the Transaction Payment so that you receive the largest payment possible without the imposition of the Excise Tax (a “Reduced Payment”). For purposes of determining whether to make a Full Payment or a Reduced Payment, the Company will cause to be taken into account all applicable federal, state and local income and employment taxes and the Excise Tax (all computed at the highest applicable marginal rate, net of the maximum reduction in federal income taxes which could be obtained from a deduction of such state and local taxes). If a Reduced Payment is made, (x) you will have no rights to any additional payments and/or benefits constituting the Transaction Payment, and (y) reduction in payments and/or benefits will occur in the manner that results in the greatest economic benefit to you as determined in this paragraph. If more than one method of reduction will result in the same economic benefit, the portions of the Transaction Payment will be reduced pro rata. Unless you and the Company otherwise agree in writing, any determination required under this section will be made in writing by the Company’s independent public accountants (the “Accountants”), whose determination will be conclusive and binding

upon you and the Company for all purposes. For purposes of making the calculations required by this section, the Accountants may make reasonable assumptions and approximations concerning applicable taxes and may rely on reasonable, good faith interpretations concerning the application of Sections 280G and 4999 of the Code. You and the Company will furnish to the Accountants such information and documents as the Accountants may reasonably request in order to make a determination under this section. The Company will bear all costs the Accountants may reasonably incur in connection with any calculations contemplated by this section as well as any costs incurred by you with the Accountants for tax planning under Sections 280G and 4999 of the Code.

It is intended that all of the severance benefits and other payments payable under this Agreement satisfy, to the greatest extent possible, the exemptions from the application of Section 409A of the Code (“Section 409A”) provided under Treasury Regulations 1.409A-1(b)(4), 1.409A-1(b)(5) and 1.409A-1(b)(9), and this Agreement will be construed to the greatest extent possible as consistent with those provisions, and to the extent not so exempt, this Agreement (and any definitions hereunder) will be construed in a manner that complies with Section 409A. For purposes of Section 409A (including, without limitation, for purposes of Treasury Regulation Section 1.409A-2(b)(2)(iii)), your right to receive any installment payments under this Agreement (whether severance payments, reimbursements or otherwise) will be treated as a right to receive a series of separate payments and, accordingly, each installment payment hereunder will at all times be considered a separate and distinct payment. Notwithstanding any provision to the contrary in this Agreement, if you are deemed by the Company at the time of your Separation from Service to be a “specified employee” for purposes of Section 409A(a)(2)(B)(i), and if any of the payments upon Separation from Service set forth herein and/or under any other agreement with the Company are deemed to be “deferred compensation”, then to the extent delayed commencement of any portion of such payments is required in order to avoid a prohibited distribution under Section 409A(a)(2)(B)(i) and the related adverse taxation under Section 409A, such payments will not be provided to you prior to the earliest of (i) the expiration of the six-month period measured from the date of your Separation from Service with the Company, (ii) the date of your death or (iii) such earlier date as permitted under Section 409A without the imposition of adverse taxation. Upon the first business day following the expiration of such time period, all payments deferred pursuant to this section will be paid in a lump sum to you, and any remaining payments due will be paid as otherwise provided herein or in the applicable agreement. No interest will be due on any amounts so deferred.

You and the Company have previously executed the Company’s standard arbitration agreement that is contained in your Employee Invention Assignment, Confidentiality and Arbitration Agreement (the “Arbitration Agreement”), which agreement remains in full force and effect. You acknowledge and agree to all of the Company’s policies in effect during your employment with Company, including, but not limited to, the policies found in the MongoDB Employee Handbook and the Arbitration Agreement.

Your employment relationship with the Company is “at-will." That means you are free, at any time, for any reason, to end your employment with the Company and that the Company may do the same. Our agreement regarding employment-at-will may not be changed, except specifically in writing signed by the Board and you.

If you agree to abide by the terms outlined in this letter, please sign this letter below and also sign the attached copy and return it to me. I wish you the best in your future endeavors.