Senior React Native Developer

Ruby Labs

3d•Remote

About The Position

Ruby Labs is seeking a Senior React Native Developer to join their engineering team and lead their expansion into mobile. This role is for an individual who is passionate about product quality, enjoys tackling architectural challenges, and desires ownership of features that users depend on. The developer will be instrumental in building and scaling mobile applications, influencing the future of the company's mobile offerings, and collaborating with backend and product teams to ensure a seamless, reliable, and high-performance user experience.

Requirements

5+ years of experience building mobile applications, with significant React Native experience.
Experience mentoring engineers through code reviews, architecture, and incident response is a strong plus.
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 Haves

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.

Responsibilities

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.