Mobile Developer - React Native

Quartermaster-posted 3 months ago
Full-time • Mid Level
Washington, DC
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We’re hiring a React Native/React engineer with deep, production-scale RN experience who can also write native Kotlin to build and maintain custom Android modules when required. You’ll maintain offline-first apps used in challenging environments (at sea) where connectivity is intermittent and local real-time video and device control must remain resilient.

  • Create beautiful, easy-to-use, atomic components. Make them adaptable for internationalization to allow the app to scale as the number of features and languages the app supports grows.
  • End-to-end ownership: feature delivery, performance, reliability, and release operations for both apps.
  • Offline-first architecture: model data for local-first UX (SQLite/Room or similar), implement sync, conflict resolution, and schema migrations.
  • Streaming & media: implement and optimize live video ingest/playback, jitter buffers, reconnection, Adaptive Bitrate Streaming (ABR), and Quality of Service (QoS) telemetry.
  • Kotlin native modules: design and maintain native modules with Kotlin when necessary.
  • Harsh-network engineering: handle satellite/maritime and field conditions such as high latency, packet loss, power/thermal constraints, and others.
  • Security by design: SRTP key management, TLS/DTLS, cert pinning, Android Keystore, and privacy-preserving telemetry.
  • Tooling & quality: tests (unit/integration), CI/CD, profiling, etc.
  • Bachelor’s degree in Computer Science, Electrical Engineering, or related field.
  • Proven experience in hardware and software engineering, with a strong understanding of product lifecycle management.
  • Familiarity with smart technologies and solutions, particularly in analyzing and supporting deployed systems.
  • Excellent problem-solving skills and the ability to work collaboratively in a fast-paced environment with people across the globe in various time zones.
  • Strong communication skills, both written and verbal, to effectively interact with contractors and stakeholders.
  • 3+ years building mobile apps, 2+ years focused on React Native at scale (navigation, animations, perfect memory/threading management).
  • Strong Android/Kotlin skills with production RN or fully native apps deployed to the Google Play Store.
  • Hands-on with offline-first architectures and local databases (SQLite + ORM/query builders like Kysely, Room, or equivalent).
  • Real-time video experience on mobile: Protocols: RTSP, SRTP; transports: TCP/UDP.
  • Stacks: ExoPlayer, ffmpeg-kit, etc.
  • Concepts: RTP timing, packetization, jitter buffering, keyframe cadence, reconnect/backoff, and Adaptive Bitrate Streaming (ABR).
  • Networking: understanding of sockets, firewalls, mDNS/zeroconf, WebSockets, QoS metrics (latency, jitter, loss, stall rate).
  • Proven testing practice with Jest.
  • Comfortable migrating apps from earlier Expo versions to the latest Expo/React Native/Android releases, config plugins, and bare when needed.
  • ROS2 ecosystem familiarity: ROS2 topics, services, commands, etc.
  • PTZ protocols (e.g., Axis) and camera vendor SDKs.
  • Map rendering, offline tile management, and geolocation-based strategies such as geofencing.
  • AWS Serverless (API Gateway, Lambda, Cognito, S3, CloudWatch), monorepos.
  • Automated E2E testing experience, observability (Crashlytics, Grafana), feature flagging, A/B testing.
  • Comfortable writing automated end-to-end system checks for unit testing during the factory acceptance process.
  • Competitive salary
  • Flexible work hours and the option for remote work.
  • Opportunities for professional development and continued education.
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