{"id":99553,"url":"https://alion.io/job/mattermost-com-senior-full-stack-engineer-2","title":"Senior Full Stack Engineer","company":{"id":38744,"name":"Mattermost","domain":"mattermost.com","url":"https://alion.io/company/mattermost-com","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["United States"],"countries":["US"],"hiring_countries":["US"],"hiring_countries_total":1,"salary":{"min":142723,"max":172723,"currency":"USD","period":"year","gross":null,"usd_annual":172723},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agentic Workflows","optional":false},{"name":"AI Agents","optional":false},{"name":"Claude Code","optional":false},{"name":"Copilot","optional":false},{"name":"Cursor","optional":false},{"name":"Go","optional":false},{"name":"Microsoft Teams","optional":false},{"name":"Outlook","optional":false},{"name":"PostgreSQL","optional":false},{"name":"React.js","optional":false},{"name":"Redis","optional":false},{"name":"Rest API","optional":false},{"name":"TypeScript","optional":false},{"name":"WebSockets","optional":false},{"name":"JavaScript","optional":true},{"name":"Model Context Protocol","optional":true}],"status":"live","first_seen_at":"2026-08-07T18:24:44Z","employer_posted_date":"2026-08-13","last_verified_at":"2026-10-16T16:35:20Z","board_verified":true,"closed_at":null,"days_open":69,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":69},"description":"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.\nTo learn more, visit www.mattermost.com\nWe are seeking a Senior Full Stack Engineer to help build and scale Mattermost's core web platform for teams operating in defense and critical infrastructure sectors. You will contribute across our Go backend and React/TypeScript web frontend, building features that hold up under strict security, compliance, and reliability requirements.\nOur 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.\nWhat You Will Do\nArchitect and build full-stack features optimized for scalability and performance across Go, React, TypeScript, PostgreSQL, and Redis\nLeverage AI coding agents such as Claude Code and Cursor as a core part of your daily workflow while retaining full accountability for correctness, security, and design decisions\nDevelop internal tooling and testing infrastructure to speed up the team's delivery, including agentic workflows and skills that make AI tooling more effective for the broader team\nOwn testing strategy across frontend and backend code you ship\nDesign and consume REST and WebSocket APIs with solid networking fundamentals\nMaintain the security and compliance standards required by our government and enterprise clients\nContribute to Mattermost's open-source codebase\nWhat We Are Looking For\nRequired:\nStrong full-stack development experience in Go and React, or a comparable stack\nExperience designing and consuming REST and WebSocket APIs with solid networking fundamentals\nRelational database experience including PostgreSQL, schema design, and query optimization\nHands-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\nBias toward shipping and owning complex software end-to-end without close supervision\nNice to Have:\nExperience with distributed systems or high-availability service architecture\nFamiliarity with enterprise or regulated-environment security requirements\nBackground in defense, intelligence, or critical infrastructure products\nOpen-source contributions\nExperience working on distributed or remote-first teams\nExperience building tools, skills, or workflows on top of AI coding agents including MCP servers, agent skills, or CI-integrated agents\nHow Success Is Measured\nFirst 90 Days: Shipping full-stack features on the core platform using an AI-forward agentic development workflow and owning testing strategy across the code you ship.\nWhy Mattermost\nMission-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\nRemote-first culture: Work from anywhere with a globally distributed, high-trust team built for autonomy and ownership\nAI-forward environment: We actively adopt and build AI-enabled workflows. Agentic development is core craft here, not a novelty\nEnd-to-end ownership: Ship and own complex software across the full stack with real accountability for what you build\nOpen source at the core: Be part of a vibrant developer community shaping the future of secure collaboration\nCompensation\nMattermost takes a market-based approach to pay. Actual compensation may vary based on location, skills, experience, qualifications, and market conditions.\nTarget Salary Range: $142,723- $172,723\n\nU.S. Eligibility & Compliance\nThis role may require obtaining and maintaining a U.S. government security clearance. Candidates must meet federal eligibility requirements to be considered. For more information visitSecurity Clearances - United States Department of State\nApplicants 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 theBureau of Industry and Security and the Directorate of Defense Trade Controls.\nMattermost is an EEO Employer, we are a remote-first, open-source company.\nWe are continually working to expand our hiring in more countries and regions, ensuring compliance with local laws and regulations, which takes time.\nMattermost 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.\nIf you require accommodations during the interview process, please let us know-we’re happy to assist.","description_format":"text","description_chars":5816,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["National Security","Military Communication","Team Communication & Collaboration"],"lifecycle":[{"event":"open","at":"2026-08-07T18:24:44Z"}],"visa":[],"liveness":{"score":59,"band":"ok","label":"Likely open","p_open":1,"p_active":0.816,"p_room":0.72,"age_days":69,"expected_fill_days":136,"reasons":["conf:2","win:mid","crowd:"],"computed_at":"2026-10-16T05:45:00Z"},"pay":{"stated_usd_annual":172723,"is_top_pay":false},"html_url":"https://alion.io/job/mattermost-com-senior-full-stack-engineer-2","json_url":"https://alion.io/job/mattermost-com-senior-full-stack-engineer-2.json","meta":{"generated_at":"2026-10-16T17:05:20Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":1768,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-17T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":38744},"rest":"https://alion.io/mcp/rest/get_company?id=38744"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fmattermost-com-senior-full-stack-engineer-2"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fmattermost-com-senior-full-stack-engineer-2"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fmattermost-com-senior-full-stack-engineer-2"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/mattermost-com-senior-full-stack-engineer-2\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fmattermost-com-senior-full-stack-engineer-2"}]}