Senior Mobile Engineer - React Native (Offline-First) - Remote

Atomic Hr; Buenos Aires; Remote; ARS 107,614,000 - 169,108,000; Full time

Benefits offered by this job

Remote work from LATAM

Job summary

Join Tether as a Mobile Engineer React Native (100% Remote). You will own Keet Mobile, a peer-to-peer chat app for iOS and Android, built with React Native and Expo. You’ll ship end-to-end features, manage offline-first data, and ensure smooth sync with the backend across global users.

You’ll collaborate with the core P2P, design and product teams, write tests, review code, and optimize startup time, memory and battery on real devices. Core hours align with US time zones; LATAM remote role.

Qualifications

• 4+ years building mobile apps with React Native
• Offline-first experience with local storage, queued writes, retries
• Performance tuning on low-end Android devices
• Daily use of AI coding tools (Cursor/Claude Code) with TypeScript and CI
• Clear written and spoken English for client communications
• Experience working from written acceptance criteria and pushback when needed

Responsibilities

• Set up Apple and Google developer accounts, signing, CI builds and testing tracks
• Build local storage, write queue and retry logic for offline use
• Define sync and upload APIs with backend developer and resolve conflicts
• Implement phone-number sign-in with SMS codes and push notifications fallback
• Build camera capture and e-signature flows with versioned records
• Measure startup time, memory, and app size on low-end Android phones
• Handle store submissions, privacy disclosures and monitoring

Skills

React Native

Offline-first

Performance optimization

TypeScript

AI coding tools

English communication

Tools

WebSockets

REST APIs

Swift

Kotlin

Xcode

Android Studio

Job description

Join Tether as a Mobile Engineer React Native (100% Remote). You will own Keet Mobile, a peer-to-peer chat app for iOS and Android, built with React Native and Expo. You’ll ship end-to-end features, manage offline-first data, and ensure smooth sync with the backend across global users.

You’ll collaborate with the core P2P, design and product teams, write tests, review code, and optimize startup time, memory and battery on real devices. Core hours align with US time zones; LATAM remote role.