Senior Full Stack Engineer, Mattermost

• 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
• 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

Desirable

• 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
• Our engineering culture is AI-forward. 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
• 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
• 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
• By Month 6: Internal tooling and testing infrastructure built that measurably speeds up the broader team's delivery. Agentic development practices adopted and contributing to team-wide velocity
• At Year One: Recognized as the team's driver of agentic engineering practice. Deepening ownership of distributed systems and high-availability architecture. Contributing actively to Mattermost's open-source codebase
• 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