Senior React Native Developer

We are looking for an experienced developer to provide final polishing and ongoing maintenance for the mobile app — a cross-platform application for advanced wearable ring technology. This is a project-based role focused on getting the app launch-ready, with excellent opportunity for long-term hourly-rate collaboration on maintenance, bug fixes, and new feature development.

Tech Stack Frontend: React Native (primary) + custom native modules in Kotlin (Android) and Swift (iOS) Backend: Firebase (Firestore + Authentication) for user profiles and wearable (ring) data

What You’ll Do Take full ownership of the final polishing phase of the cross-platform React Native app Complete all remaining UI/UX refinements, performance optimizations, and bug fixes to deliver a premium, smooth user experience Develop and maintain custom native modules in Kotlin and Swift for advanced ring functionality (NFC interactions, token management, device pairing, etc.) Ensure seamless data synchronization and flow with Firebase Support post-launch maintenance, updates, and implementation of new features as needed Deliver outstanding reliability, performance, and user experience across both iOS and Android

Requirements 3+ years of hands-on React Native experience Strong proficiency writing and maintaining custom native code in Kotlin (Android) and Swift (iOS) Solid experience with Firebase (Firestore, Authentication, and related services) Experience with wearable devices, NFC hardware integrations, or payment-related features is a big plus Ability to work independently, deliver clean and maintainable code, and communicate progress clearly

Contract Details Project-based with milestone payments for final delivery Competitive hourly rate for ongoing maintenance, updates, and additional features Fully remote Long-term collaboration possible if the partnership works well