I have a fully-functioning SaaS web platform and now want the same experience packaged as a native-feeling application for both iOS and Android. All current features live behind a well-structured REST/GraphQL API, so the core of the job is to consume those endpoints, wrap them in a polished mobile UI, and add in-app credit/debit card payments (Stripe or similar gateway is fine as long as it supports strong SCA). Security is critical. While I already host the backend, I’m open to recommendations on how best to harden it—whether that’s end-to-end encryption, 2FA for admin routes, periodic penetration testing, or any other best practice you feel is essential. I need guidance as well as implementation. Deliverables • Universal codebase that builds cleanly for iOS & Android and mirrors existing web functionality • Integrated card payment flow, tested in sandbox and live modes • Security upgrades on the server with documented steps and configs • Store-ready builds plus a concise hand-over guide so my team can maintain and update going forward If you have deep mobile experience and a track record of shipping secure, payment-enabled apps, I’d love to see your approach and a realistic timeline.