[All remote jobs](https://jobicy.com/jobs.md)[![Mattermost logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2022/02/ecb6ff3992a12e3be49b73ca8a11f5c5.webp)](https://jobicy.com/company/mattermost.md)[Mattermost](https://jobicy.com/company/mattermost.md) # Staff Full Stack Engineer Review the role, location requirements, compensation details, and application process before deciding whether this opportunity fits your next career move. [Apply for this job](#job-application)[View company](https://jobicy.com/company/mattermost.md)ShareRemote from[USA](https://jobicy.com/job-region/usa.md)SalaryUSD 172,724–227,135 / yrDepartment[Software Engineering](https://jobicy.com/categories/engineering.md)EmploymentFull TimeExperienceSeniorPublished22 Oct 2026Apply before21 Nov 2026Listing views44Application actions1Application toolkit ## Make your next move. Prepare your resume, explore your fit, and draft a cover letter for this opportunity. AI Summary ## The role, at a glance. Mattermost is seeking a Staff Full Stack Engineer to set technical direction for its secure, high-compliance collaboration platform. The role spans Go backend systems, React and TypeScript web applications, PostgreSQL, Redis, REST APIs, and WebSocket architecture. This staff-level engineer will lead cross-team architectural decisions, improve testing and internal tooling, mentor senior engineers, and shape AI-agentic engineering standards. The platform serves defense, government, and critical-infrastructure use cases, requiring strong judgment around security, reliability, compliance, and distributed systems. The role is remote-first, with U.S. eligibility requirements connected to government-clearance and export-control obligations. ## Role DNA A quick view of the complexity, pace, ownership and collaboration implied by the job description. ### Job Complexity 5/5EasyHard ### Pace & Pressure 4/5RelaxedFast-paced ### Autonomy Level 5/5GuidedFull ownership ### Communication Load 5/5IndependentCollaborative AI insightThis is a staff-level technical leadership role requiring deep full-stack and distributed-systems expertise alongside organization-wide influence. Success depends on making high-stakes architecture and quality decisions in security- and compliance-sensitive environments. ## Salary analysis Estimated compensation compared with the broader US market for similar roles. Estimated job median (per year)Market rate$199,929.50US market range (per year)$170k–$240k0$264k AI insightThe yearly pay period is inferred from the job context; it was not explicitly stated by the employer. The employer lists a target salary range of $172,724–$227,135. The posting does not explicitly state a pay cadence, but the amounts are reasonably inferred to be annual USD base salary for a U.S.-based staff-level software engineering role. The estimated U.S. market range for comparable staff full-stack engineering roles is approximately $170,000–$240,000 per year. ## Core skills Skills and capabilities most closely associated with this opportunity. [Go](https://jobicy.com/jobs?search_keywords=Go.md)[React](https://jobicy.com/jobs?search_keywords=React.md)[TypeScript](https://jobicy.com/jobs?search_keywords=TypeScript.md)[PostgreSQL](https://jobicy.com/jobs?search_keywords=PostgreSQL.md)[Redis](https://jobicy.com/jobs?search_keywords=Redis.md)[Distributed systems](https://jobicy.com/jobs?search_keywords=Distributed%20systems.md)[High-availability architecture](https://jobicy.com/jobs?search_keywords=High-availability%20architecture.md)[REST API design](https://jobicy.com/jobs?search_keywords=REST%20API%20design.md)[WebSocket](https://jobicy.com/jobs?search_keywords=WebSocket.md)[Network engineering](https://jobicy.com/jobs?search_keywords=Network%20engineering.md)[Software architecture](https://jobicy.com/jobs?search_keywords=Software%20architecture.md)[Test automation](https://jobicy.com/jobs?search_keywords=Test%20automation.md)[AI coding agents](https://jobicy.com/jobs?search_keywords=AI%20coding%20agents.md)[Security compliance](https://jobicy.com/jobs?search_keywords=Security%20compliance.md)[Technical mentorship](https://jobicy.com/jobs?search_keywords=Technical%20mentorship.md) Sample interview questionsHow would you approach defining a technical roadmap for a core web platform used in regulated and high-availability environments?I would begin with a structured assessment of the current architecture, operational risks, customer requirements, delivery bottlenecks, and technical debt. I would prioritize initiatives by security impact, reliability improvement, user value, and cross-team leverage, then align the roadmap with measurable outcomes such as availability, latency, defect escape rate, and engineering cycle time. I would communicate trade-offs clearly and revisit priorities as compliance and customer needs evolve. Describe how you would design a scalable real-time collaboration feature using REST and WebSocket APIs. I would use REST endpoints for durable resource operations, authentication, history retrieval, and idempotent commands, while using WebSockets for low-latency events and presence updates. The design would include authorization at connection and channel levels, message ordering or versioning where needed, backpressure handling, reconnection behavior, observability, and horizontal scaling through shared event infrastructure. I would also define clear API contracts and load-test failure scenarios before broad rollout. How do you use AI coding agents while retaining accountability for code quality and security? I use agents to accelerate well-bounded work such as scaffolding, repetitive refactors, test generation, documentation drafts, and code exploration. I retain ownership by reviewing generated changes, validating assumptions against architecture and security requirements, running tests and static analysis, and checking edge cases manually. At an organizational level, I would establish safe usage patterns, review expectations, and CI guardrails rather than treating agent output as inherently trustworthy. What is your approach to raising testing quality across multiple frontend and backend teams? I would first identify the highest-risk gaps through production incidents, coverage quality, flaky-test trends, and release defects. I would define pragmatic standards for unit, integration, contract, end-to-end, performance, and security testing, while improving shared tooling so teams can meet those standards efficiently. Design reviews, quality metrics, mentoring, and accountability for testability during implementation are essential to making the strategy durable. How have you influenced technical direction without direct management authority? I build credibility through strong technical analysis, reliable delivery, and a clear understanding of other teams’ constraints. I frame proposals around customer impact, operational risk, and measurable engineering outcomes, invite stakeholders into the decision process, and document trade-offs transparently. I also help teams adopt changes by contributing migration plans, reusable tooling, and hands-on support rather than only issuing recommendations. Opportunity details ## About this role. Mattermost is the leading collaborative workflow platform for defense, intelligence, security, and critical infrastructure. Trusted by the U.S. Department of War and Fortune 500s, our platform runs on-premises and in private clouds, delivering secure messaging, file sharing, workflow automation, audio/screenshare, and project management—all with full data and operational control. Mattermost powers high-stakes workflows across mission planning, real-time, real-world operations, DevSecOps, incident response, and cyber defense—enabling secure collaboration from tactical edge and DDIL environments to enterprise HQ. Teams operate across web, desktop, and mobile, with embedded interoperability for Microsoft Teams, Outlook, and Microsoft 365. To learn more, visit [www.mattermost.com](http://www.mattermost.com/) We are seeking a Staff Full Stack Engineer to set the technical direction for and scale Mattermost’s core web platform for teams operating in defense and critical infrastructure sectors. You’ll drive architecture and technical strategy across our Go backend and React/TypeScript web frontend — partnering across teams to ship features that hold up under strict security, compliance, and reliability requirements. Our engineering culture is AI-forward. We expect engineers to work fluently with AI coding agents such as Claude Code day-to-day — for scaffolding, refactors, code review, and test generation — and treat that as core craft rather than a shortcut. We would rather hire smart people who get stuff done than chase an exact tech-stack match. If you have a track record of shipping and owning complex software end-to-end, we want to hear from you. What You Will Do * Define and drive the technical architecture and roadmap for Mattermost’s core web platform across multiple engineering teams, spanning Go, React, TypeScript, PostgreSQL, and Redis * Set org-wide standards and best practices for AI-agentic engineering workflows — going beyond personal fluency with tools like Claude Code and Cursor to shape how the broader engineering org adopts them, while retaining accountability for correctness, security, and design decisions * Lead the internal tooling and testing infrastructure strategy that speeds up delivery for the broader engineering org, not just your immediate team * Own the testing strategy and quality bar across frontend and backend systems, and hold other engineers accountable to it through design reviews and mentorship * Drive architectural decisions for REST and WebSocket API design, grounded in deep networking fundamentals * Partner directly with security, compliance, and product leadership on strategic technical bets tied to our government and enterprise customer requirements * Mentor senior engineers and act as a technical multiplier across the org * Contribute to and help shape technical direction for Mattermost’s open-source codebase What We Are Looking For Required: * Senior full-stack development experience in Go and React (or a comparable stack), with a track record of owning complex systems end-to-end * Proven experience designing and owning distributed systems or high-availability service architecture at scale * Experience designing and consuming REST and WebSocket APIs with solid networking fundamentals * Relational database experience including PostgreSQL, schema design, and query optimization * Hands-on daily fluency directing AI coding agents such as Claude Code, Cursor, or Copilot for scaffolding, refactors, code review, and test generation — with the judgment to know when to trust the output and when to take the wheel yourself * Demonstrated ability to influence technical direction across multiple teams without relying on formal authority * Experience mentoring senior engineers and raising the technical bar for a broader team * Comfortable operating in regulated or high-compliance environments (e.g., enterprise security, government, or critical infrastructure requirements) Nice to Have: * Prior experience operating as a staff, principal, or technical lead engineer at another company * Experience maintaining (not just contributing to) an open-source project * Program-level familiarity with compliance frameworks relevant to defense or government customers (e.g., FedRAMP, ITAR) * Experience helping scale engineering practices or standards across a growing organization * Background in defense, intelligence, or critical infrastructure products * Experience building tools, skills, or workflows on top of AI coding agents including MCP servers, agent skills, or CI-integrated agents How Success Is Measured First 90 Days: Build cross-team credibility by shipping a meaningful full-stack feature on the core platform, while assessing the technical landscape and identifying the highest-leverage architectural or process improvements to pursue. Why Mattermost * Mission-driven work: Your contributions directly support the organizations and missions that depend on secure, reliable collaboration including the U.S. Department of War and critical infrastructure operators worldwide * Remote-first culture: Work from anywhere with a globally distributed, high-trust team built for autonomy and ownership * AI-forward environment: We actively adopt and build AI-enabled workflows. Agentic development is core craft here, not a novelty * End-to-end ownership: Ship and own complex software across the full stack with real accountability for what you build * Open source at the core: Be part of a vibrant developer community shaping the future of secure collaboration Compensation Mattermost takes a market-based approach to pay. Actual compensation may vary based on location, skills, experience, qualifications, and market conditions. Target Salary Range: $172,724 – $227,135 U.S. Eligibility & Compliance This role may require obtaining and maintaining a U.S. government security clearance. Candidates must meet federal eligibility requirements to be considered. For more information visit[Security Clearances — United States Department of State](https://www.state.gov/securityclearances) Applicants must meet eligibility requirements for access to export-controlled information as defined by U.S. export control laws, including EAR and ITAR. For more information visit the[Bureau of Industry and Security](https://www.bis.doc.gov) and the[Directorate of Defense Trade Controls](https://www.pmddtc.state.gov). Mattermost is an EEO Employer, we are a remote-first, open-source company. We are continually working to expand our hiring in more countries and regions, ensuring compliance with local laws and regulations, which takes time. Mattermost values your unique perspective—we welcome all applicants. We encourage individuals from all backgrounds to apply and are committed to assessing candidates based on their skills and qualifications. We do not tolerate discrimination against staff or applicants based on race, religion, national origin, age, disability, pregnancy status, veteran status, or other personal characteristics. If you require accommodations during the interview process, please let us know—we’re happy to assist. 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