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Mobile Developer - React Native
Mobile Developer - React NativeQuartermaster • Washington, DC, United States
Mobile Developer - React Native

Mobile Developer - React Native

Quartermaster • Washington, DC, United States
[job_card.variable_days_ago]
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  • [job_card.full_time]
[job_card.job_description]

Role overview

Were 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. Youll 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.

What youll work on

1 - An app that gives mariners control of a SmartMast unit!

A LAN / offline first mobile app that connects to and controls a nearby SmartMast unit. It maintains persistent, low-latency, full-duplex communication via WebSockets and ROS 2, while also syncing with an AWS-hosted backend API. Video from the PTZ camera streams over RTSP / SRTP using TCP or UDP. Because the most powerful features run on the local network, strong knowledge of networking and device discovery (e.g., mDNS / zeroconf, addressing, NAT / firewalls, QoS) is also essential.

Tech requirements :

  • React Native
  • Expo
  • Javascript
  • TypeScript
  • SQLite
  • Web Sockets
  • ROS2 Protocol
  • Video streaming libraries
  • RTSP / SRTP
  • TCP / UDP
  • Network discovery (mDNS)
  • Adaptive offline first behavior
  • Unit testing with Jest and experience with automated end-to-end test workflows

2 - An app to help mariners report illegal activity at sea

A multilingual mobile app that enables mariners to document and report illegal activity at sea by securely uploading photos and videos, even offline. A modular, accessible UI delivers a smooth experience, while maps and precise geolocation power on-device validation of each report. The app syncs with an AWS-hosted API (monorepo; Serverless Framework; TypeScript; PostgreSQL) and follows an offline-first strategy to keep devices updated in low-connectivity environments. When needed, native Kotlin modules enable integrations with local IoT devices.

This project also has a web admin page for user management and other integrations.

Tech Requirements :

  • React Native
  • React
  • Expo
  • TypeScript
  • Javascript
  • SQLite
  • Unit testing with Jest and an automated end-to-end test experience
  • Adaptive offline first behavior
  • Network discovery (mDNS)
  • AWS
  • Serverless Framework
  • HTML
  • CSS
  • Familiarity with Geolocation-based algorithms and data formats

    • Responsibilities

  • 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.

    • Minimum Qualifications

  • Bachelors 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.

    • Nice to Have

  • 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.

    • Benefits

  • Competitive salary
  • Flexible work hours and the option for remote work.
  • Opportunities for professional development and continued education.

    • #J-18808-Ljbffr

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