Senior React Native Developer

Ruby Labs is a leading tech company that creates and operates innovative consumer products across the health, education, and entertainment industries.

• 5+ years of experience building mobile applications, with significant React Native experience.
• Experience mentoring engineers through code reviews, architecture, and incident response.
• Strong understanding of mobile system design, component architecture, state management, navigation patterns, and performance trade-offs.
• Experience optimizing UI performance, memory usage, rendering efficiency, and startup time.
• Deep knowledge of React internals and rendering behavior (hooks, reconciliation, lifecycle, render cost).
• Experience working with native modules and iOS/Android bridging.
• Shipped and maintained apps on the App Store and Google Play.
• Experience with CI/CD, builds, release automation, and OTA updates (EAS, CodePush, or similar).
• Experience implementing monitoring and observability (Sentry, OpenTelemetry, crash reporting, performance tracing).
• Demonstrated ownership of edge cases, distributed failure modes, degraded APIs, offline sync, and recovery UX.
• Demonstrated ability to lead architecture or technical strategy for a mobile app or major feature.
• Maintains high standards for clean code, SOLID principles, maintainability, and documentation.

Nice to have:

• Experience in startup or high-ownership product teams.
• Experience scaling real-time or multi-region mobile architectures.
• Experience designing or building design systems, shared component libraries, or mobile platform foundations.
• Experience improving mobile security, analytics, performance profiling, and release automation.
• Knowledge of edge caching, streaming real-time events, WebSockets, or offline-first architectures.

• Contribute to the development and delivery of new mobile product features.
• Maintain and improve the existing React Native codebase, performance, and stability.
• Define and evolve mobile architecture, system design, and technical strategy.
• Partner with backend, product, and design teams to shape solutions that scale.
• Drive reliability, performance, and observability standards on mobile.
• Own production debugging, incident investigation, and root cause analysis.
• Guide improvements in build systems, CI/CD, releases, testing, and app store deployments.
• Support hiring and help grow a world-class mobile engineering team.
• Champion performance across rendering, navigation, latency, memory, offline behavior, caching, and real-time experiences.

Candidates must be located within approximately ±4 hours of the Central European Time (CET) zone to ensure optimal collaboration and communication during working hours.