Senior React Native Engineer

Join Mattermost as a Senior React Native Engineer, where you'll take ownership of the mobile experience for teams working in defense, intelligence, and critical infrastructure. This fully remote position involves architecting and evolving the React Native application for deployment in environments with limited connectivity, shaping mobile development tooling, and driving performance improvements. You'll also mentor engineers on mobile architecture and best practices, uphold security and compliance standards, and contribute to the open-source codebase.

• Architect and evolve the React Native application for deployment environments with limited or unreliable connectivity, defining how the app handles WebSocket reliability and data synchronization.
• Shape mobile development tooling, code organization, and testing infrastructure, driving performance improvements across network efficiency, package size, and memory consumption.
• Mentor engineers on mobile architecture and best practices, upholding security and compliance standards required by government and enterprise clients.

• We care about what you've built and the problems you've solved — not how long you've been building. If you have strong outcomes to speak to in mobile engineering, we want to hear from you
• Strong understanding of networking fundamentals: HTTP, WebSockets, connection lifecycle, and how to build resilient apps over unreliable networks
• AI fluency and a track record of adapting to new tooling as the landscape evolves
• Demonstrated experience with React Native and JavaScript/TypeScript — you can speak to real tradeoffs you've navigated
• Experience with offline-first design — local persistence, sync strategies, and conflict resolution
• Familiarity with native iOS and/or Android development
• Experience with reactive programming patterns (e.g. RxJS) or mobile database solutions (e.g. WatermelonDB)
• Familiarity with the Expo framework, including migration from bare React Native
• Mobile security best practices in enterprise or regulated environments
• Background in defense, intelligence, or critical infrastructure products
• Experience in distributed or remote-first engineering teams
• Open-source contributions
• Experience improving mobile developer tooling or testing infrastructure
• 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