Secure Enterprise Document App

I’m building “TrustSafe,” an offline-first mobile app that lets our staff open highly sensitive PDFs on their phones while keeping every byte protected. The Flutter scaffold is in place; what I need now is a security-minded developer to finish the heavy lifting... (Budget: $250 - $750 USD, Jobs: API Integration, Conflict Resolution, Documentation, Flutter, Google Cloud Storage, Mobile App Development, Security, SQLite)