Most important:

• Open to candidates based in North America or Latam

• 8+ years building production mobile applications, including 5+ years in React Native at senior level or above

• Demonstrable architect-level ownership — you've designed a mobile architecture that other engineers built on for years, not just delivered features inside one

• Deep, hands-on experience with React Native's New Architecture: JSI, Fabric, TurboModules, Codegen, and bridgeless mode, including custom native modules and components you wrote yourself

• Strong native iOS and Android skills: Swift/Objective-C++ and Kotlin, with real comfort in C++ for shared cores or performance-critical paths

• Proven multithreading work in React Native: worklets, worklet runtimes, Reanimated internals, background runtimes, and the serialization/lifetime rules that make them safe

• A track record of sustained 60–120fps under real-time data load, with concrete before/after numbers you can walk through

• Real-time data experience: high-message-rate WebSocket streaming, backpressure handling, binary protocols, and architectures that decouple ingest rate from render rate

• High-performance charting experience in React Native — Skia, GPU canvas, or a custom native renderer — beyond dropping in an off-the-shelf chart library

• Expert-level profiling across Hermes, Perfetto/Systrace, Instruments, React DevTools, and Flashlight

The bonus skills:

• Experience at a trading, brokerage, crypto exchange, or high-frequency fintech app, or comparable real-time consumer scale elsewhere

• Options-specific product work: options chains, multi-leg order tickets, greeks, payoff diagrams, implied volatility surfaces

• Nitro Modules, or other experience reducing JS↔native call overhead on hot paths

• Open source contributions to the React Native ecosystem, or conference/blog work on RN performance

• Experience in a regulated environment: security review, certificate pinning, tamper/jailbreak detection, auditability, accessibility compliance

• Experience running OTA/CodePush-style release infrastructure with feature-flagged rollouts

Personal traits:

• Measures before touching code — diagnoses whether a stall is JS thread, UI thread, commit phase, GC, or GPU before reaching for a fix

• Comfortable being the final call on hard architectural trade-offs, like deciding when a screen needs a native fallback and owning both sides of it

• Writes the design docs and runs the architecture reviews, not just the code — raises the bar for everyone around them

• Treats a dropped frame as a bug, not a nice-to-have

• Mentors naturally, pairing on the hard traces and sharing what the profiler actually revealed