POWER OF ATTORNEY Know all by these presents, that the undersigned hereby constitutes and appoints Kerry Acocella of Datadog, Inc. and Jodie M. Bourdet and Ron A. Metzger of Cooley LLP, or any of them signing singly, with full power of substitution, the undersigned's true and lawful attorney in fact to: (1) prepare, execute in the undersigned’s name and on the undersigned’s behalf, and submit to the U.S. Securities and Exchange Commission (the “SEC”) a Form ID Application to Obtain EDGAR Access Codes and any other forms necessary to generate EDGAR codes on my behalf enabling the undersigned to make electronic filings with the SEC of reports required by Section 16(a) of the Securities Exchange Act of 1934 or any rule or regulation of the SEC; (2) execute for and on behalf of the undersigned, in the undersigned's capacity as a director, officer and/or a 10% stockholder of Datadog, Inc. (the “Company”), Forms 3, 4, and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder; (3) do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form 3, 4, or 5, complete and execute any amendment or amendments thereto, and timely file such form with the SEC and any stock exchange or similar authority; and (4) take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney in fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney in fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney in fact may approve in such attorney-in-fact's discretion. The undersigned hereby grants to such attorney in fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney in fact, or such attorneyinfact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. This Power of Attorney shall remain in full force and effect until either the undersigned is no longer required to file Forms 3, 4, and 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company or unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorney in fact. IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of July 1, 2024 /s/ David Galloreese Signature David Galloreese Print Name