Exhibit 23.1

Independent Registered Public Accounting Firm’s Consent

We consent to the inclusion in this Registration Statement of LightJump Acquisition Corporation (the “Company”) on Amendment No. 1 to Form S-1, File No. 333-251435, of our report dated October 9, 2020, except for Note 8 as to which the date is December 29, 2020, which includes an explanatory paragraph as to the Company’s ability to continue as a going concern, with respect to our audit of the financial statements of LightJump Acquisition Corporation as of September 11, 2020 and for the period from July 28, 2020 (inception) through September 11, 2020, which report appears in the Prospectus, which is part of this Registration Statement. We also consent to the reference to our Firm under the heading “Experts” in such Prospectus.

/s/ Marcum llp

Marcum llp

New York, NY

December 29, 2020