Staff Full Stack Engineer

What you’ll do

• Set technical direction for the platform across the stack
• Architect and roadmap decisions across teams
• Influence standards for how the org uses coding agents
• Mentor senior engineers and partner with security and compliance
• Architect and ship full stack features end to end and own testing strategy

What they’re looking for

• Track record of shipping and owning complex software end-to-end
• Staff, principal or tech lead experience preferred
• Open-source maintainership is a plus
• FedRAMP or ITAR familiarity is a plus
• Background in defense or critical infrastructure is a plus
• Experience with distributed systems and high availability architecture (nice to have)
• Regulated-environment security experience (nice to have)

Skills

• Go: backend, core platform
• React: frontend, TypeScript
• TypeScript: React, frontend
• PostgreSQL: relational databases, schema design, query optimization
• Redis: core platform
• REST: APIs, networking fundamentals
• WebSocket: APIs, connection lifecycle
• HTTP: networking fundamentals, connection lifecycle
• Coding agents: Claude Code, Cursor, planning, building, reviewing, testing, shipping

The post

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

Mattermost (https://mattermost.com) 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.

Both openings are full stack on the core platform: Go backend, React/TypeScript frontend, PostgreSQL and Redis. The codebase is public (https://github.com/mattermost/mattermost), so most of what you build is too. We would rather hire people who ship and own complex software end to end than chase an exact stack match, so any systems or backend language and any frontend stack counts. What we look for in both roles: REST and WebSocket APIs with real networking fundamentals (HTTP, connection lifecycle), and relational databases including schema design and query optimization.

We use coding agents daily (Claude Code, Cursor, and others) at every stage of the work: planning, building, reviewing, testing, and shipping. We treat that as core craft rather than a shortcut around the fundamentals. If you have a track record of shipping and owning complex software end-to-end, we want to hear from you.

Senior Full Stack Engineer $142,723 - $172,723 USD Architect and ship full stack features end to end, own the testing strategy for what you ship, and build internal tooling and testing infrastructure that makes the rest of the team faster. You will work without close supervision and hold the security and compliance bar our customers require. Nice to have: distributed systems and high availability architecture, regulated-environment security, open-source contributions, experience on remote-first teams.

Join our team: https://job-boards.greenhouse.io/mattermost/jobs/5379251008

Staff Full Stack Engineer $172,724 - $227,135 USD Set technical direction for the platform rather than for a feature area: architecture and roadmap across the stack, the standards for how the org uses coding agents, and the strategy for internal tooling and testing. You will influence direction across teams, partner with security and compliance on it, and mentor senior engineers. Nice to have: staff, principal or tech lead experience elsewhere, open-source maintainership, FedRAMP or ITAR familiarity, defense or critical infrastructure background.

Join our team: https://job-boards.greenhouse.io/mattermost/jobs/5405811008

Both roles have Canadian postings: https://job-boards.greenhouse.io/mattermost