As someone who works in software engineering and has experience in multiple languages, infosec, as well as working through compliance with multiple certification standards, I'd be happy to help, provided one of two conditions is met:

1. You pay me my salary rate, with a minimum of 10 hours, half in advance and report available after receipt of full payment (grew up with tradespeople and a lot about working with clients comes from what I learned from them).

Or,

2. The code base is fully, and permanently open-sourced, prior to code review. This means licensing under GPL, LGPL, MIT, or BSD licenses, or equivalent, not "source available".