React Native Developer — Background GPS + Safety Alert App

Required • Proven experience with React Native (Expo or bare workflow) • Has implemented background GPS in mobile apps — this is the most critical requirement • Experience with external APIs (OAuth, REST) • Clear communication in English (Portuguese is a plus) Nice to Have • Experience with Strava API or Garmin API • Experience with Twilio for automated calls • Experience with Supabase or Firebase • Knowledge of Bluetooth BLE in React Native • Background in health, safety, or fitness apps Not Required • Designer — the design is already done • No-code / Bolt.new experience