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Senior and Staff Full Stack Engineer at Mattermost

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Mattermost | Remote (US and Canada) | FT | Multiple Roles

Mattermost is an open-core collaboration and workflow automation platform for air-gapped, on-prem, and private clouds. Our customers are in defense, intelligence, security, and critical infrastructure, including the USAF and NASA. Y Combinator led our Series B, their largest open-source investment at the time.

About the Roles

Both openings are full-stack on the core platform: Go backend, React/TypeScript frontend, PostgreSQL, and Redis. The codebase is public, so most of what you build is too.

We prioritize hiring people who ship and own complex software end-to-end over chasing an exact stack match; any systems or backend language and any frontend stack experience counts.

What We Look For

  • Networking Fundamentals: Experience with REST and WebSocket APIs (HTTP, connection lifecycle).
  • Database Expertise: Experience with relational databases, including schema design and query optimization.
  • Modern Workflow: We use coding agents daily (Claude Code, Cursor, and others) for scaffolding, refactors, code review, and test generation. We treat this as core craft rather than a shortcut.
  • Ownership: A proven track record of shipping and owning complex software end-to-end.

Senior Full Stack Engineer

Salary: $142,723 - $172,723 USD

Responsibilities

  • Architect and ship full-stack features end-to-end.
  • Own the testing strategy for your work.
  • Build internal tooling and testing infrastructure to improve team velocity.
  • Work without close supervision while maintaining the high security and compliance standards our customers require.

Nice to Have

  • Experience with distributed systems and high-availability architecture.
  • Experience with regulated-environment security.
  • Open-source contributions.
  • Experience on remote-first teams.

Apply Here

Staff Full Stack Engineer

Salary: $172,724 - $227,135 USD

Responsibilities

  • Set technical direction for the platform (architecture and roadmap across the stack).
  • Define standards for how the organization uses coding agents.
  • Define the strategy for internal tooling and testing.
  • Influence direction across teams, partner with security and compliance, and mentor senior engineers.

Nice to Have

  • Previous experience as a Staff, Principal, or Tech Lead.
  • Open-source maintainership.
  • FedRAMP or ITAR familiarity.
  • Background in defense or critical infrastructure.

Apply Here

Additional Information

  • Canadian Applicants: Both roles have specific Canadian postings available here.

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