At Mattermost, we build the #1 collaborative workflow solution for defense, intelligence, security, and critical infrastructure organizations. Trusted by governments, financial institutions, and technology companies, our platform enables secure, efficient operations for the world’s most critical teams.

We’re dedicated to empowering organizations to operate with confidence, reducing risks, and accelerating productivity. Guided by our core values of Customer Obsession, Earn Trust, Self Awareness, Ownership and High Impact, we collaborate closely with our customers to deliver solutions that meet complex needs and drive success.

Mattermost is seeking a talented and passionate React Native Engineer to join our mobile engineering team and help deliver world-class mobile experiences for mission-critical industries like defence, intelligence, and critical infrastructure. You'll be responsible for building and maintaining our React Native applications that enable secure, real-time collaboration for organisations where reliability and security are non-negotiable.

As a React Native Engineer at Mattermost, you'll work closely with cross-functional teams to create mobile solutions that solve complex communication challenges in high-stakes environments. Your work will directly impact how critical organisations coordinate, share information, and respond to urgent situations. This role offers the unique opportunity to contribute to our open-source platform while building mobile applications that serve some of the world's most important missions.

Do you have a passion for designing and developing high-impact products? Do you want to work with a well-oiled, collaborative and highly senior team? Do you want to make an impact on open source? Help us build and grow one of the largest React Native and Go open-source projects.

Responsibilities Include:

• Design, develop, and maintain high-performance capabilities for the Mattermost React Native application for iOS and Android platforms
• Build responsive, accessible mobile interfaces that work seamlessly across different devices and screen sizes
• Implement secure communication features, push notifications, and real-time messaging capabilities
• Optimise mobile app performance, including bundle size, startup time, and memory usage
• Collaborate with backend engineers to integrate mobile apps with APIs and ensure smooth data synchronisation
• Contribute to Mattermost's open-source React Native codebase, sharing solutions with the broader developer community
• Work with product managers and designers to translate user requirements into technical solutions and prototypes
• Implement comprehensive testing strategies including unit tests and automated end-to-end testing
• Debug and resolve mobile-specific issues across different platforms, devices, and operating system versions
• Participate in code reviews and provide mentorship to colleagues on mobile best practices
• Stay current with tools, libraries and frameworks including advancements in AI/LLM tools and best practices
• Ensure our mobile application meets strict security and compliance requirements for enterprise and government clients

Requirements:

• BS in Computer Science, Computer Engineering, or related field/experience
• 3+ years of professional experience developing mobile applications with React Native
• Experience with native iOS and Android development concepts and the ability to write native modules when needed
• Solid understanding of mobile app deployment processes for both App Store and Google Play Store
• Proficiency with AI/LLM tools to improve and accelerate development
• Knowledge of mobile-specific patterns including navigation, offline functionality, and platform-specific UI guidelines
• Experience with state management libraries (Redux, Zustand, or similar) and async data handling
• Proficiency with reactive programming patterns using RxJS and experience with local database solutions like WatermelonDB
• Familiarity with mobile testing frameworks and debugging tools for React Native applications
• Understanding of mobile security best practices and secure coding principles
• Strong problem-solving skills and ability to work independently in a remote, distributed team environment
• Excellent written and verbal communication skills for collaborating across time zones

Preferences:

• Previous experience building end user products for enterprises or security-focused users
• Contributions to open-source projects
• Knowledge of accessibility standards and implementing inclusive mobile experiences
• Has worked fully remotely with global teams
• Expertise in defence, intelligence, or security-focused workflows

Mattermost takes a market-based approach to pay and pay may vary depending on your location. The successful candidate’s starting pay will be determined based on job-related skills, experience, qualifications, work location, and market conditions. These ranges may be modified in the future.

Mattermost is an EEO Employer, We are a remote-first, open-source company.

We are continually working to expand our hiring in more countries and regions, ensuring compliance with local laws and regulations, which takes time.

Mattermost values your unique perspective—we welcome all applicants. We encourage individuals from all backgrounds to apply and are committed to assessing candidates based on their skills and qualifications. We do not tolerate discrimination against staff or applicants based on race, religion, national origin, age, disability, pregnancy status, veteran status, or other personal characteristics.

If you require accommodations during the interview process, please let us know—we’re happy to assist.

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