Senior Full Stack Engineer

About this role

• Mattermost is the leading collaborative workflow platform for defense, intelligence, security, and critical infrastructure.
• Department of War and Fortune 500s, our platform runs on-premises and in private clouds, delivering secure messaging, file sharing, workflow automation, audio/screenshare, and project management-all with full data and operational control.
• Mattermost powers high-stakes workflows across mission planning, real-time, real-world operations, DevSecOps, incident response, and cyber defense-enabling secure collaboration from tactical edge and DDIL environments to enterprise HQ.
• Teams operate across web, desktop, and mobile, with embedded interoperability for Microsoft Teams, Outlook, and Microsoft 365.
• To learn more, visit www.mattermost.com We are seeking a **Senior Full Stack Engineer** to help build and scale Mattermost's core web platform for teams operating in defense and critical infrastructure sectors.
• You will contribute across our Go backend and React/TypeScript web frontend, building features that hold up under strict security, compliance, and reliability requirements.
• We expect engineers to work fluently with AI coding agents such as Claude Code day-to-day - for scaffolding, refactors, code review, and test generation - and treat that as core craft rather than a shortcut.
• We would rather hire smart people who get stuff done than chase an exact tech-stack match.
• If you have a track record of shipping and owning complex software end-to-end, we want to hear from you.
• **What You Will Do** * Architect and build full-stack features optimized for scalability and performance across Go, React, TypeScript, PostgreSQL, and Redis * Leverage AI coding agents such as Claude Code and Cursor as a core part of your daily workflow while retaining full accountability for correctness, security, and design decisions * Develop internal tooling and testing infrastructure to speed up the team's delivery, including agentic workflows and skills that make AI tooling more effective for the broader team * Own testing strategy across frontend and backend code you ship * Design and consume REST and WebSocket APIs with solid networking fundamentals * Maintain the security and compliance standards required by our government and enterprise clients * Contribute to Mattermost's open-source codebase **What We Are Looking For** Required: * Strong full-stack development experience in Go and React, or a comparable stack * Experience designing and consuming REST and WebSocket APIs with solid networking fundamentals * Relational database experience including PostgreSQL, schema design, and query optimization * Hands-on daily fluency directing AI coding agents such as Claude Code, Cursor, or Copilot for scaffolding, refactors, code review, and test generation - with the judgment to know when to trust the output and when to take the wheel yourself * Bias toward shipping and owning complex software end-to-end without close supervision Nice to Have: * Experience with distributed systems or high-availability service architecture * Familiarity with enterprise or regulated-environment security requirements * Background in defense, intelligence, or critical infrastructure products * Open-source contributions * Experience working on distributed or remote-first teams * Experience building tools, skills, or workflows on top of AI coding agents including MCP servers, agent skills, or CI-integrated agents **How Success Is Measured** * First 90 Days: Shipping full-stack features on the core platform using an AI-forward agentic development workflow and owning testing strategy across the code you ship.
• **Why Mattermost** * 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 Target Salary Range: $142,723- $172,723 *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 offers a remote-first work environment with medical, dental, and vision coverage.
• You'll also receive unlimited PTO plus company holidays, a work from home stipend, an annual learning and development budget for conferences, certifications, and courses, paid parental leave for all parents, and a 401(k) plan.
• **U.S.
• Eligibility & Compliance** This role may require obtaining and maintaining a U.S.
• government security clearance.
• Candidates must meet federal eligibility requirements to be considered.
• For more information visit Security Clearances - United States Department of State 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.

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