Senior Mobile/Frontend Engineer (React Native)

We are looking for a Mobile / Frontend Engineer (React Native) for a 100% Remote, 12 month +, 1099 contract

No 3rd Party C2Cs Please.

Location: Colombia, South America (work remote supporting US based client/project)

Employment Type: Contract Work, 40 hours weekly

100% Requirement: Must have good verbal & written communication (English)

Overview

The Sr. Mobile/Frontend Engineer is the primary implementation owner of the React Native/Expo cross-platform client - the single codebase that delivers the student, volunteer, staff, and teacher experience across iOS tablets, Android tablets, and web browsers. This role owns the full client lifecycle: local-first architecture with SQLite offline queue, optimistic UI updates and server reconciliation, real-time SignalR integration, the QR payment flow, Expo EAS build and OTA update pipeline, and all role-specific screen experiences across the 12-phase simulation. The product’s educational impact is delivered almost entirely through this codebase. Animation quality, offline resilience, accessibility conformance, and role-specific UX fidelity are the direct outputs of this role.

Required Qualifications

• 6+ years of software engineering experience, with at least 3 years building production React Native applications targeting both iOS and Android
• Deep understanding of React Native’s New Architecture (JSI, Fabric, TurboModules); able to reason about the performance characteristics of animations running on the native UI thread vs. the JavaScript thread
• Experience with Expo and the Expo EAS build pipeline; familiar with OTA update workflows, managed vs. bare workflow trade-offs, and native module integration
• Proficiency implementing local-first client patterns: offline queue design, optimistic UI updates, reconciliation on reconnect, and idempotency key management on the client side
• Experience integrating real-time WebSocket or SignalR clients in a React Native application; understands group management, reconnection handling, and replay buffer consumption

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• Strong CSS/styling proficiency in React Native; able to implement complex, responsive layouts that work correctly on iOS tablets, Android tablets, and web browsers from a single stylesheet

Preferred Qualifications

• Experience implementing Reanimated 3 worklets for complex, multi-step animations on the native thread
• Familiarity with SQLite in React Native (expo-sqlite or equivalent); experience designing local cache schemas for offline-first applications
• Exposure to WCAG 2.2 AA implementation in React Native, including focus management, ARIA role mapping, and automated accessibility auditing in the mobile context
• Experience with SVG-based or canvas-based drawing surfaces in React Native for in-app design tools or similar
• Background in educational technology or child-facing applications; ability to design screens that are age-appropriate for grades 5–6 without being condescending