Quartermaster AI · 3 months ago
Mobile Developer - React Native
United States
Full-time
Remote
Mid Level
3+ years expQuartermaster is seeking a Mobile Developer with expertise in React Native and Kotlin to build and maintain applications for mariners. The role involves developing offline-first mobile apps that ensure resilient connectivity and real-time control of devices in challenging environments.
Defense & Space
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
Qualification
Required
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
Preferred
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.
Company
Quartermaster AI
We are a defense technology company using proprietary AI robotics tech to build a sensor constellation to deliver unprecedented insights into global maritime activity.
11-50 employees
H1B Sponsorship
Quartermaster AI has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (1)
Funding
Current Stage
Early StageCompany data provided by crunchbase