Senior Mobile Engineer

Deep expertise in iOS or Android development, with strong working knowledge of the other platform

Strong understanding of mobile architecture, platform SDKs, lifecycle constraints, and networking fundamentals

Experience building reliable mobile systems that behave predictably through unreliable connectivity, local state changes, synchronization, and recovery

Strong mobile performance profiling and production debugging skills on real devices

Experience using production data, crash metrics, and release-health signals to drive reliability improvements

Experience making architecture recommendations and owning technical outcomes

Ability and willingness to work across native and cross-platform codebases

AI fluency and experience using coding agents to increase engineering output while applying judgment to ensure reliable outcomes

Experience with React Native and TypeScript

Experience with mobile persistence, synchronization, or offline-capable systems

Experience with real-time communications or platform media frameworks such as WebRTC, CallKit, or Android audio APIs

Experience with enterprise mobile distribution, MDM, AppConfig, or Intune MAM

Experience building mobile software for security-sensitive, regulated, or operationally constrained environments

Open-source contributions

Mission-driven work: Your contributions directly support the organizations and missions that depend on secure, reliable collaboration including the U.S. Department of War and critical infrastructure operators worldwide

Remote-first culture: Work from anywhere with a globally distributed, high-trust team built for autonomy and ownership

AI-forward environment: We actively adopt and build AI-enabled workflows. Agentic development is core craft here, not a novelty

End-to-end ownership: Ship and own complex software across the full stack with real accountability for what you build

Open source at the core: Be part of a vibrant developer community shaping the future of secure collaboration

This role may require obtaining and maintaining a U.S. government security clearance. Candidates must meet federal eligibility requirements to be considered.

Applicants must meet eligibility requirements for access to export-controlled information as defined by U.S. export control laws, including EAR and ITAR. For more information visit the Bureau of Industry and Security and the Directorate of Defense Trade Controls .