Reeflex Solutions — Regulatory Filings 2021

May 14, 2021

May 14, 2021

Ontario Securities Commission British Columbia Securities Commission Alberta Securities Commission

Dear Sirs/Mesdames:

Re: Bigstack Opportunities I Inc. (the "Company")

We refer to the prospectus of the Company dated May 14, 2021 (the "Prospectus") relating to the qualification of the up to 5,000,000 common shares of the Company.

We consent to being named and to the use, including through incorporation by reference in the abovementioned Prospectus, of our audit report to the shareholders of Bigstack Opportunities I Inc. dated May 14, 2021, on the following financial statements:

• Audited financial statements of Bigstack Opportunities I Inc. as at December 31, 2020, which comprise the statements of financial position as at December 31, 2020, and the statements of comprehensive loss, statements of changes in equity and statements of cash flows for the period from November 25, 2020 (date of incorporation) to December 31, 2020, and the related notes comprising a summary of significant accounting policies and other explanatory information.

We report that we have read the Prospectus and all information specifically incorporated by reference therein and have no reason to believe that there are any misrepresentations in the information contained therein that are derived from the financial statements upon which we have reported or that are within our knowledge as a result of our audit of such financial statements. We have complied with Canadian generally accepted standards for an auditor's consent to the use of a report of the auditor included in an offering document, which does not constitute an audit or review of the Prospectus as these terms are described in the CPA Canada Handbook – Assurance.

Yours very truly,

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Chartered Professional Accountants Licensed Public Accountants