Senior React Native Mobile Engineer Offline-First Remote

Atomic Hr; Bogotá; Remote; COP 70,622,000 - 148,306,000; Full time

Job summary

Atomic HR is seeking a mobile developer to own an offline-first iOS and Android app from project setup through public launch on the App Store and Google Play. This fully remote contractor role runs about 40 hours a week, with core hours in US time zones.

You will collaborate with the lead and backend developers, set up Apple/Google developer accounts, signing, CI, builds and testing tracks; implement local storage, write queue, retry logic and manage sync APIs.

Qualifications

• 4+ years building mobile applications, including React Native apps released on both the App Store and Google Play.
• Offline-first approach with local storage, queued writes, retries and conflict handling.
• Performance tuning on low-end Android devices, with measurable startup time improvements.
• Daily use of AI coding tools in production mobile work, with TypeScript, automated tests and CI around it.
• Clear written and spoken English for PR descriptions, risk notes and tradeoff explanations to a client team.
• Experience working from written acceptance criteria, and the judgment to push back on a merge that misses them.

Responsibilities

• Set up Apple and Google developer accounts, signing, CI builds and testing tracks
• Build the local storage, write queue and retry logic that keep the app working offline
• Agree the sync and upload APIs with the backend developer, and decide how conflicting edits resolve
• Build phone-number sign-in with SMS codes, and push notifications that fall back to SMS
• Build camera capture and e-signature flows that save each signed record as a new version
• Measure and improve startup time, memory and app size on low-end Android phones
• Handle store submissions, privacy disclosures and review rejections, and add crash and sync monitoring

Skills

Mobile development (React Native)

Offline-first apps

Android performance tuning

AI coding tools (Cursor/Claude Code)

English communication

Tools

React Native

CI/CD

TypeScript

Job description

Atomic HR is seeking a mobile developer to own an offline-first iOS and Android app from project setup through public launch on the App Store and Google Play. This fully remote contractor role runs about 40 hours a week, with core hours in US time zones.

You will collaborate with the lead and backend developers, set up Apple/Google developer accounts, signing, CI, builds and testing tracks; implement local storage, write queue, retry logic and manage sync APIs.