Senior Full Stack Engineer
Mattermost2 months ago
Toronto, CanadaSenior
Responsibilities
- Architect and build scalable, high-performance full-stack features across Go, React, TypeScript, PostgreSQL, and Redis
- Use AI coding agents such as Claude Code and Cursor for scaffolding, refactoring, code review, and test generation while retaining accountability for correctness, security, and design
- Develop internal tooling, testing infrastructure, agentic workflows, and skills that improve team delivery and AI-tool effectiveness
- Own testing strategy across shipped frontend and backend code
- Design and consume REST and WebSocket APIs using solid networking fundamentals
- Maintain security and compliance standards for government and enterprise customers
- Contribute to Mattermost’s open-source codebase
- Drive adoption of agentic engineering practices and deepen ownership of distributed systems and high-availability architecture
Requirements
- 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
- Daily fluency directing AI coding agents such as Claude Code, Cursor, or Copilot for scaffolding, refactoring, code review, and test generation
- Ability to ship and own complex software end-to-end without close supervision
- Experience with distributed systems or high-availability service architecture is preferred
- Familiarity with enterprise or regulated-environment security requirements is preferred
- Experience in defense, intelligence, or critical infrastructure products is preferred
- Open-source contributions are preferred
- Experience working on distributed or remote-first teams is preferred
- Experience building tools, skills, or workflows on top of AI coding agents, including MCP servers, agent skills, or CI-integrated agents, is preferred
- Candidates must be legally authorized to work in Canada without current or future sponsorship
- Candidates may need to obtain and maintain a government security clearance or equivalent designation depending on customer engagement
Benefits
- Remote-first culture with work-from-anywhere flexibility and a globally distributed team
- Mission-driven work supporting secure collaboration for defense, government, and critical infrastructure organizations
- AI-forward environment where agentic development is core to the engineering workflow
- End-to-end ownership of complex software
- Open-source development and participation in a developer community
- Candidates must be legally authorized to work in Canada without current or future sponsorship; government security clearance or equivalent designation may be required depending on customer engagement
Tech Stack
Categories
About Mattermost
Mattermost builds an open-source, enterprise collaboration platform for secure messaging, workflow automation, and DevSecOps, deployed on‑premises or in private clouds. It sells enterprise licenses and a single‑tenant SaaS offering to government, defense, and critical infrastructure organizations, with integrations across web, desktop, and mobile. Founded in 2016 and headquartered in Palo Alto, the privately held company is used by agencies such as the U.S. Department of Defense.