Company facts
- Founded
- 2023
- Employees
- 120
- Headquarters
- United States
- CEO
- Ian Tien
About
Mattermost provides secure collaboration for technical and operational teams that work in environments with complex nation-state level security and trust requirements. We serve technology, public sector, national defense and financial services industries with customers ranging from tech giants, to the world’s largest banks, to the U.S. Department of Defense and governmental agencies around the world. Our self-hosted and cloud offerings provide team messaging, file sharing, integrations, audio and screen share, workflow automation and project management on an open source platform deployed by the world’s most secure and mission critical organizations. We co-build the future of collaboration with over 4,000 open source project contributors who’ve provided over 30,000 code improvements towards our shared product vision, which is translated into 20 languages.
Open positions

Staff Full Stack Engineer
The Staff Full Stack Engineer will lead technical architecture and strategy for Mattermost's core platform, utilizing Go, React, and AI-agentic workflows to support secure collaboration for defense and critical infrastructure clients.

Senior Full Stack Engineer
Build and scale Mattermost's secure, compliance-first web platform using Go, React/TypeScript, PostgreSQL, and Redis while leveraging AI coding agents daily.