[Hiring] Staff Full Stack Engineer @Mattermost

Role Description

We are seeking a Staff Full Stack Engineer to set the technical direction for and scale Mattermost’s core web platform for teams operating in defense and critical infrastructure sectors. You’ll drive architecture and technical strategy across our Go backend and React/TypeScript web frontend — partnering across teams to ship 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. 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

• Define and drive the technical architecture and roadmap for Mattermost’s core web platform across multiple engineering teams, spanning Go, React, TypeScript, PostgreSQL, and Redis.
• Set org-wide standards and best practices for AI-agentic engineering workflows.
• Lead the internal tooling and testing infrastructure strategy that speeds up delivery for the broader engineering org.
• Own the testing strategy and quality bar across frontend and backend systems.
• Drive architectural decisions for REST and WebSocket API design.
• Partner directly with security, compliance, and product leadership on strategic technical bets tied to our government and enterprise customer requirements.
• Mentor senior engineers and act as a technical multiplier across the org.
• Contribute to and help shape technical direction for Mattermost’s open-source codebase.

Qualifications

• Senior full-stack development experience in Go and React (or a comparable stack), with a track record of owning complex systems end-to-end.
• Proven experience designing and owning distributed systems or high-availability service architecture at scale.
• 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.
• Demonstrated ability to influence technical direction across multiple teams without relying on formal authority.
• Experience mentoring senior engineers and raising the technical bar for a broader team.
• Comfortable operating in regulated or high-compliance environments (e.g., enterprise security, government, or critical infrastructure requirements).

Requirements

• Prior experience operating as a staff, principal, or technical lead engineer at another company.
• Experience maintaining (not just contributing to) an open-source project.
• Program-level familiarity with compliance frameworks relevant to defense or government customers (e.g., FedRAMP, ITAR).
• Experience helping scale engineering practices or standards across a growing organization.
• Background in defense, intelligence, or critical infrastructure products.
• Experience building tools, skills, or workflows on top of AI coding agents including MCP servers, agent skills, or CI-integrated agents.

Benefits

• 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.
• 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.

Company Description

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.