Senior React Native EngineerSumCircle Technologies Private Limited • bangalore, India
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Senior React Native Engineer
SumCircle Technologies Private Limited • bangalore, India
2 days ago
Job descriptionWhat You’ll Do Build high-performance RN apps with TypeScript, React Navigation, and modern state management (Zustand / Jotai / Redux Toolkit). Own Expo / EAS workflows : managed / bare transitions, EAS Build, EAS Submit, EAS Update (OTA) channels / rollbacks, runtime versioning, and multi-env release strategies. Realtime UX : Integrate websockets / Server-Sent Events for live markets; design efficient list virtualization, windowing, and incremental rendering to keep P95 / P99 frames smooth. Performance & stability : profile with Flipper / Hermes profiling / Systrace, optimize bridge usage, and adopt TurboModules / JSI where needed. Native integrations : design and maintain light native modules (Kotlin / Swift / Obj-C) for critical paths (secure storage, biometrics, low-latency sockets). Quality & security : ship with full test coverage (unit, component, contract, E2E with Detox / Maestro), robust error handling, code-push guardrails, secure secrets handling. Observability : instrument mobile telemetry (crashlytics / Sentry, OpenTelemetry), build dashboards, and drive data-informed iteration. Release engineering : implement canary rings, phased rollouts, forced updates, feature flags / experiments, and app store compliance checks. Collaboration : partner with Backend / Infra to shape APIs, caching, pagination, and backpressure strategies; contribute to design reviews and RFCs Minimum Qualifications 5+ years building production mobile apps, 3+ years with React Native (TypeScript). Deep experience with Expo + EAS (Build, Submit, Update / OTA, runtime versioning, update groups, rollbacks). Strong command of mobile performance : render lifecycles, React concurrency, memoization strategies, list virtualization, image caching, and animation optimization (Reanimated). Solid understanding of networking & realtime on mobile (websocket lifecycle, reconnect / backoff, QoS, regional endpoints, metered networks). Proficient with secure storage & auth (biometrics, device binding, keychain / keystore, OAuth / OIDC / PKCE, session management, jailbreak / root detection signals). Testing discipline : Jest + RTL, contract tests against mock servers, E2E (Detox / Maestro) in CI, flake-resistant test design. CI / CD for mobile : Fastlane or EAS pipelines, signing management, env-driven configs, artifact provenance, and store submission automation. Experience shipping on iOS and Android; comfort with Xcode / Gradle, provisioning, and store review nuances Bonus Points JSI / TurboModules, Fabric, custom native views, and bridging performance-critical paths. Offline-first architectures (normalized caches, optimistic updates, background sync). Data visualisation on mobile (high-frequency charts with downsampling / decimation). Accessibility (WCAG), internationalization, RTL, and dynamic type. App telemetry privacy models, consent flows, and regional compliance. Background tasks, push notifications, deep links, universal links, and widgets. Experience in trading / fintech, high-reliability or safety-critical apps.
Senior React Native Engineer — Mobile Trading & Realtime Systems
Location : Banglore
Team : Mobile
Type : Full-time
- Mission
Own our mission-critical mobile apps built with React Native (TypeScript) and Expo. You’ll deliver a fast, reliable, and secure trading experience with realtime data, offline resilience, and zero-downtime updates via Expo EAS.
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Engineer React Native • bangalore, India
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