Full-stack Developer / security engineer needed to finalize Claude Code Web App

About the project We've built a two-sided marketplace platform connecting interim professionals with clients (it's done in Claude Code). The app handles user authentication, role-based access (freelancers vs. clients), file uploads, and payments via Stripe. It's not yet live, but we want a professional Developer to double check the current architecture and security risks before moving forward and going live. We probably still want to make some changes before we go live, so it could become a long-term collaboration. We are looking for experienced people that actually know what they are doing. Not just pushing our code into LLM's again.