Reeflex Solutions — Regulatory Filings 2024

Feb 28, 2024

Form 52-109FV1 Certification of Annual Filings Venture Issuer Basic Certificate

I, Eric Szustak, Chief Financial Officer of Bigstack Opportunities I Inc. , certify the following:

1. Review: I have reviewed the annual financial statements and annual MD&A (together, the “ annual filings ”) of Bigstack Opportunities I Inc. (the “ issuer ”) for the financial year ended December 31, 2023.

2. No misrepresentations: Based on my knowledge, having exercised reasonable diligence, the annual filings do not contain any untrue statement of a material fact or omit to state a material fact required to be stated or that is necessary to make a statement not misleading in light of the circumstances under which it was made, with respect to the period covered by the annual filings.

3. Fair presentation: Based on my knowledge, having exercised reasonable diligence, the annual financial statements together with the other financial information included in the annual filings fairly present in all material respects the financial condition, financial performance and cash flows of the issuer, as of the date of and for the periods presented in the annual filings.

Date: , 2024 February 27

(signed) " Eric Szustak "

Eric Szustak Chief Financial Officer

NOTE TO READER

In contrast to the certificate required for non-venture issuers under National Instrument 52-109_Certification_
of Disclosure in Issuers’ Annual and Interim Filings(NI 52-109), this Venture Issuer Basic Certificate does not
include representations relating to the establishment and maintenance of disclosure controls and
procedures (DC&P) and internal control over financial reporting (ICFR), as defined in NI 52-109. In particular,
the certifying officers filing this certificate are not making any representations relating to the establishment
and maintenance of
I.controls and other procedures designed to provide reasonable assurance that information
required to be disclosed by the issuer in its annual filings, interim filings or other reports filed
or submitted under securities legislation is recorded, processed, summarized and reported
within the time periods specified in securities legislation; and
II.a process to provide reasonable assurance regarding the reliability of financial reporting and
the preparation of financial statements for external purposes in accordance with the issuer’s
GAAP.
The issuer’s certifying officers are responsible for ensuring that processes are in place to provide them with
sufficient knowledge to support the representations they are making in this certificate. Investors should be
aware that inherent limitations on the ability of certifying officers of a venture issuer to design and
implement on a cost effective basis DC&P and ICFR as defined in NI 52-109 may result in additional risks to
the quality, reliability, transparency and timeliness of interim and annual filings and other reports provided
under securities legislation.