Letter Agreement Amendment, dated January 30, 2023, by and among Constellation Acquisition Corp I, its officers and directors, Constellation Sponsor GmbH & Co. KG, and other parties thereto

Exhibit 10.2

AMENDMENT TO THE LETTER AGREEMENT

This AMENDMENT TO LETTER AGREEMENT (this “Amendment”), dated as of January 30, 2023, is entered into by and between Constellation Acquisition Corp I, a Cayman Islands exempted company (the “Company”), Constellation Sponsor GmbH & Co. KG, a German limited partnership (the “Sponsor”) and each of the undersigned (the “Insiders”). The Company, the Sponsor and the Insiders shall be referred to herein from time to time collectively as the “Parties” and individually as a “Party.”

RECITALS

WHEREAS, the Company, the Sponsor and the Insiders are party to that certain Sponsor Letter Agreement, dated as of January 26, 2021 (the “Letter Agreement”);

WHEREAS, the Parties wish to amend the Letter Agreement as set forth herein.

NOW, THEREFORE, in consideration of the premises and the mutual promises contained herein and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties, each intending to be legally bound, hereby agree as follows:

1. Defined Terms and Rules of Interpretation. Except as otherwise expressly provided herein, capitalized terms used herein without definition shall have the same meanings herein as set forth in the Letter Agreement after giving effect to this Amendment.

2. Amendment to Transfer of Shares provision. A new Section 8(d) is hereby added to the Sponsor Letter Agreement as follows:

“Notwithstanding the foregoing, the Transfer of Founder Shares or Private Placement Warrants, directly or indirectly, to affiliate(s) of Antarctica Capital Partners, LLC shall not be restricted by this Section 8.”

3. Miscellaneous; Incorporation by Reference. Except to the extent specifically amended or superseded by the terms of this Amendment, all of the provisions of the Letter Agreement shall remain in full force and effect to the extent in effect on the date hereof. This Amendment shall be governed by, and otherwise construed in accordance with, the terms of the Letter Agreement, as though the other provisions of this Amendment were set forth in the Letter Agreement. The Letter Agreement, as modified by this Amendment, constitutes the complete agreement between the Parties and supersedes any prior written or oral agreements, writings, communications or understandings with respect to the subject matter hereof. This Amendment may be executed in counterparts (including by means of facsimile or scanned and emailed signature pages), any one of which need not contain the signatures of more than one Party, but all such counterparts taken together shall constitute one and the same agreement. Sections 19 (Governing Law) and Section 20 (Notices) of the Letter Agreement are hereby incorporated by reference into this Amendment mutatis mutandis.

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IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be executed by their duly authorized representatives as of the date first written above.

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be executed by their duly authorized representatives as of the date first written above.

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