Senior Full Stack Engineer
Mattermost · United States
About this role
## Senior Full Stack Engineer Mattermost is the leading collaborative workflow platform for defense, intelligence, security, and critical infrastructure—trusted by the U.S. Department of War and Fortune 500s. We deliver secure messaging, file sharing, workflow automation, audio/screenshare, and project management with full data and operational control (on-premises and private clouds). We’re 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’ll contribute across our **Go backend** and **React/TypeScript web frontend**, building features that meet strict **security, compliance, and reliability** requirements. ### What You Will Do - Architect and build full-stack features optimized for scalability and performance across **Go, React, TypeScript, PostgreSQL, and Redis** - Use **AI coding agents** (e.g., Claude Code, Cursor) as a core part of your daily workflow—while maintaining full accountability for correctness, security, and design decisions - Develop internal tooling and testing infrastructure to speed delivery, including agentic workflows and skills that improve AI tooling for the broader team - Own the testing strategy across the frontend and backend code you ship - Design and consume **REST and WebSocket APIs** with strong networking fundamentals - Maintain the security and compliance standards required by 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** (e.g., Claude Code, Cursor, Copilot) for scaffolding, refactors, code review, and test generation—plus the judgment to know when to trust outputs
Listing freshness
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