Senior React Native Engineer (Mobile)

TL;DR

Senior React Native Engineer (Mobile): Building a secure, offline-first mobile experience for defense and intelligence clients with an accent on networking reliability and data synchronization. Focus on architecting WebSocket resilience, designing conflict resolution strategies for degraded networks, and optimizing mobile performance.

Location: Remote, must meet U.S. federal eligibility requirements for security clearance and export control laws (EAR/ITAR)

Salary: $165,000 – $225,000

Company

Mattermost is a leading collaborative workflow platform designed for defense, intelligence, security, and critical infrastructure.

What you will do

• Architect and evolve the React Native application for environments with limited or unreliable connectivity.
• Define WebSocket reliability and data synchronization patterns across degraded network conditions.
• Design offline-first storage and sync patterns, including conflict resolution strategies.
• Drive performance improvements regarding network efficiency, package size, and memory consumption.
• Mentor engineers on mobile architecture and best practices.
• Contribute to the open-source codebase and uphold strict security and compliance standards.

Requirements

• Demonstrated experience with React Native and JavaScript/TypeScript.
• Strong understanding of networking fundamentals: HTTP, WebSockets, and connection lifecycles.
• Experience with offline-first design, local persistence, and sync strategies.
• Familiarity with native iOS and/or Android development.
• Must be eligible to obtain and maintain a U.S. government security clearance.
• Must meet eligibility requirements for access to export-controlled information (EAR and ITAR).

Nice to have

• Experience with reactive programming (e.g., RxJS) or mobile databases like WatermelonDB.
• Familiarity with the Expo framework and migrations from bare React Native.
• Background in defense, intelligence, or critical infrastructure products.
• Open-source contributions.
• Experience in distributed or remote-first engineering teams.

Culture & Benefits

• Remote-first work culture.
• Opportunity to contribute to an open-source project.
• Market-based compensation approach.
• Commitment to diversity, equity, and inclusion.