ruby-labs - Senior React Native Developer
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. • 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. • Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately ± 4 hours of CET. This ensures optimal collaboration and communication during working hours.
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.
Benefits
• Discover the perks of being part of our vibrant team! We offer: • Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance. • Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days. • Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge. • Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them. • Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here: https://docs.google.com/document/d/1nkrN76JlZkbKj9WSOhlT1_mni_CZeDkHdwfIjPXVwvk/preview?tab=t.0#heading=h.ndsdl4wapxtt • Be part of our fast-growing team and seize this excellent opportunity for personal and professional growth!
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