Full Stack Developer Needed — FinTech App Code Review & Audit

We have a FinTech web application built on React and Node.js that is about to go public and we want an experienced full stack developer to review the codebase before we scale. Looking for someone strong on both the frontend and backend side — not just one. We need a developer who understands how technical decisions in a financial product affect security, data accuracy, and reliability. This is a code review and audit task — no building required. You will read the code, identify the issues, and give us a clear written report with prioritized recommendations. Details and read-only repo access shared after offer accepted. Please share examples of full stack work you have done — React frontend and Node.js backend preferred. FinTech or any regulated industry experience is a strong plus.