Staff Full Stack Engineer

About The Company Mattermost is a leading collaborative workflow platform designed specifically for defense, intelligence, security, and critical infrastructure sectors. Trusted by the U.S. Department of War and Fortune 500 companies, our platform offers secure messaging, file sharing, workflow automation, audio and screenshare capabilities, and comprehensive project management features. Operating on-premises and within private clouds, Mattermost ensures complete data and operational control, enabling high-stakes workflows across mission planning, real-time operations, DevSecOps, incident response, and cyber defense. Our platform supports teams across web, desktop, and mobile environments, with embedded interoperability for Microsoft Teams, Outlook, and Microsoft 365, facilitating seamless collaboration in mission-critical scenarios. About The Role We are seeking a highly skilled Staff Full Stack Engineer to lead the technical direction and scalability of Mattermost’s core web platform tailored for defense and critical infrastructure operations. In this role, you will drive architectural decisions and set technical strategies across our Go backend and React/TypeScript frontend, collaborating with cross-functional teams to deliver features that meet stringent security, compliance, and reliability standards. Your leadership will influence organizational standards for AI-assisted engineering workflows, improve internal tooling and testing infrastructure, and uphold high-quality code practices. You will work closely with security, compliance, and product teams to align technical initiatives with customer requirements and mentor senior engineers to elevate the technical capabilities of the organization. Additionally, you will contribute to the open-source community, helping shape the future of secure collaboration tools. Qualifications Senior full-stack development experience with Go and React (or equivalent stacks)Proven track record of designing and owning distributed, high-availability systems at scaleStrong experience with REST and WebSocket API design and networking fundamentalsRelational database expertise, particularly with PostgreSQL, schema design, and query optimizationHands-on experience using AI coding agents such as Claude Code, Cursor, or Copilot for scaffolding, refactoring, code review, and test generationAbility to influence technical decisions across multiple teams without formal authorityExperience mentoring senior engineers and raising the technical barComfort working in regulated, high-compliance environments such as enterprise security, government, or critical infrastructure Responsibilities Define and execute the technical architecture and roadmap for Mattermost’s core web platform, spanning multiple engineering teamsEstablish and promote standards and best practices for AI-assisted engineering workflows organization-wideLead the development of internal tooling and testing infrastructure to accelerate delivery and maintain quality standardsOwn the testing strategy and uphold the quality bar across frontend and backend systems through design reviews and mentorshipMake architectural decisions for REST and WebSocket API design, grounded in networking fundamentalsCollaborate with security, compliance, and product leadership on strategic technical initiatives aligned with government and enterprise customer needsMentor and coach senior engineers, acting as a technical leader and multiplier across teamsContribute to the technical direction and evolution of Mattermost’s open-source codebase Benefits Opportunity to work on mission-critical, high-security applications supporting national defense and critical infrastructureRemote-first culture enabling flexible work arrangements from anywhere globallyEngagement in an AI-forward environment that adopts cutting-edge AI coding tools and workflowsEnd-to-end ownership of complex software projects with accountability and impactParticipation in an open-source community shaping the future of secure collaboration solutionsCompetitive compensation aligned with market standards, with a target salary range of $172,724 – $227,135 Equal Opportunity Mattermost is an equal opportunity employer committed to fostering an inclusive environment. We value diversity and do not discriminate against any applicant or employee based on race, religion, national origin, age, disability, pregnancy, veteran status, or other personal characteristics. We actively encourage individuals from all backgrounds to apply. If you require accommodations during the interview process, please let us know—we are happy to assist and ensure a fair hiring experience.