{"id":1219483,"url":"https://alion.io/job/fusionauth-senior-software-engineer-java-hybrid-denver-metro-preferred-fusionauth","title":"Senior Software Engineer, Java (Hybrid, Denver Metro Preferred) - FusionAuth","company":{"id":13708,"name":"FusionAuth","domain":"fusionauth.io","url":"https://alion.io/company/fusionauth","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"JazzHR","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":[],"countries":[],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":140000,"max":180000,"currency":"USD","period":"year","gross":null,"usd_annual":180000},"salary_estimate":null,"experience_years_min":8,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"CI/CD","optional":false},{"name":"Claude Code","optional":false},{"name":"GitHub Actions","optional":false},{"name":"Helm","optional":false},{"name":"JavaScript","optional":false},{"name":"Kubernetes","optional":false},{"name":"Least Privilege","optional":false},{"name":"PKI","optional":false},{"name":"Rest API","optional":false},{"name":"TCP/IP","optional":false}],"status":"live","first_seen_at":"2026-09-25T11:39:35Z","employer_posted_date":"2026-09-25","last_verified_at":"2026-10-19T02:39:54Z","board_verified":true,"closed_at":null,"days_open":23,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":23},"description":"Job Title:Senior Software Engineer, Java\nLocation: Denver, CO preferred (Hybrid)\nAbout FusionAuth\nFusionAuth is a fast-growing startup and leading provider of customer identity and access management (CIAM) software headquartered in Denver, Colorado. Our mission is to make authentication and authorization simple and secure for every developer. Our product helps businesses securely manage customer identities and access, ensuring a safe user experience for some of the largest brands in the world. We are committed to delivering exceptional value and satisfaction to our clients through top-notch service and support. With a great team and strong investors, we are expanding our team to help accelerate our growth and take FusionAuth to the next level.\nJob Summary\nFusionAuth is hiring a Senior Software Engineer to build and extend our Java-based platform, trusted by thousands of organizations and downloaded over 10 million times. You will design and ship complex features end to end, from technical design through release, and apply protocol knowledge (OAuth 2.x, OpenID Connect, SAML) that customers rely on for correct, secure implementations.\nThis is a senior individual contributor role with real influence. You will review code for correctness and architectural fit, mentor Software Engineers on debugging and testing approaches, and identify tech debt before it slows the team down. You will partner directly with Product, DevSuccess, and Support to translate technical tradeoffs into decisions the business can act on.\nEvery feature you ship runs across customer-managed, self-hosted, and dedicated cloud deployments, so backward compatibility and upgrade paths matter on every change. This position reports to the Engineering Manager.\nResponsibilites:\nFeature development:Design and build complex features end-to-end, from technical design through release. Write high-quality, secure, well-tested production code.\nTechnical design:Author Technical Design Documents (TDDs) and provide architecture recommendations on designs led by others.\nCode and design review:Serve as reviewer of record for parts of the codebase. Review for correctness, test quality, and architectural fit.\nTesting:Design test approaches for complex features, write end-to-end tests for critical paths, and evaluate test quality during code review.\nDebugging and troubleshooting:Diagnose and fix multithreaded and concurrency issues. Handle complex issues, including on-call rotation for critical customer issues (off-hours support required, though not the norm).\nDatabase:Optimize queries using indexes and constraints. Understand ORM tradeoffs and have basic NoSQL familiarity.\nSecurity:Apply least-privilege principles and understand timing attacks and encryption basics (PKI vs. symmetric).\nAI-augmented development:Use LLMs as part of the SDLC, including code review assistance, documentation drafting, and refactoring. Help the team rethink how work gets done with AI in the loop.\nTechnical roadmap:Identify areas of tech debt and propose focus areas for the team.\nCross-functional communication:Present designs and tradeoffs to Product, DevSuccess, and Support. Translate technical constraints for non-engineering partners.\nTechnical influence:Influence team decisions through clear reasoning. Support and sometimes lead knowledge-sharing sessions on FusionAuth's architecture.\nCustomer engagement:Join customer calls to discuss specific technical topics and support complex integration questions.\nDocumentation:Write clear, thorough documentation for the features you ship.\nQualifications\nIf you meet most of the required qualifications below but not all of them, apply anyway. Skills transfer, and we'd rather talk to you than miss you over a checklist.\nRequired\nExperience:8-10 years of professional software development experience, with demonstrated ownership of complex features from design through release.\nEducation:Bachelor's degree in computer science, or demonstrable experience with a broad set of theoretical topics.\nJava:Advanced Java skills, including threading, concurrency, and performance profiling.\nObject-oriented design:Strong object-oriented design and implementation skills.\nWeb fundamentals:Solid understanding of the full web stack (HTTP, TCP/IP, REST, and related protocols).\nDatabase depth:Real working knowledge of relational databases: query optimization, indexing strategy, and schema design beyond ORM abstractions.\nTesting:Experience designing test approaches for complex features and writing end-to-end tests, not just unit tests.\nFull-stack range:Comfortable working up and down the stack, including cloud infrastructure, backend services, and JavaScript on the front end.\nAI tooling:Comfortable using Claude Code, or a comparable AI-assisted development tool, as part of your daily workflow.\nWork location:FusionAuth is headquartered in the Denver metro area, and we value the collaboration that comes from working together in person. We strongly prefer candidates local to the Denver metro who can be onsite 1-2 days per week. We're open to candidates in other locations who are willing to travel to our office approximately once per quarter.\nPreferred:\nDistributed systems:Experience building highly available, high-performance, multi-threaded, API-first applications.\nAuth protocols:Working knowledge of OAuth 2.x grant types, OIDC protocol depth, and authentication enterprise integration patterns.\nKubernetes:Experience writing a basic manifest or Helm chart, with some familiarity with container orchestration in production.\nCI/CD:Experience writing GitHub Actions workflows or comparable CI/CD pipelines.\nQuantitative approach:Strong, data-driven approach to solving problems.\nLearning speed:Quick learner, comfortable mastering new technologies and skills rapidly.\nCommunication style:Holds clear technical opinions while staying open to better evidence or team input.\nPragmatism:Appreciates first-principles thinking, but knows when to stop theorizing and start building.\nStartup adaptability:Adaptable to the pace and ambiguity common in a roughly 50-person startup.\nCompensation:\n$140k - $180k expected base salary*\n*Pursuant to various state laws, we must display the pay range for this job. Since we are willing to hire within a broad spectrum of qualifications, this range is broad. The expected base salary/OTE may be adjusted based on individual qualifications, role, level and location.","description_format":"text","description_chars":6428,"description_truncated":false,"requirements":{"experience_years_min":8,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Identity Management","Developer Tools"],"lifecycle":[{"event":"open","at":"2026-09-25T11:39:35Z"}],"visa":[],"liveness":{"score":63,"band":"ok","label":"Likely open","p_open":0.85,"p_active":0.823,"p_room":0.9,"age_days":21,"expected_fill_days":37,"reasons":["seen:21","velocity","win:mid"],"computed_at":"2026-10-17T05:46:00Z"},"pay":{"stated_usd_annual":180000,"is_top_pay":true},"html_url":"https://alion.io/job/fusionauth-senior-software-engineer-java-hybrid-denver-metro-preferred-fusionauth","json_url":"https://alion.io/job/fusionauth-senior-software-engineer-java-hybrid-denver-metro-preferred-fusionauth.json","meta":{"generated_at":"2026-10-19T04:41:05Z","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":2793,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-20T00:00:00Z"}},"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":13708},"rest":"https://alion.io/mcp/rest/get_company?id=13708"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Ffusionauth-senior-software-engineer-java-hybrid-denver-metro-preferred-fusionauth"},{"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%2Ffusionauth-senior-software-engineer-java-hybrid-denver-metro-preferred-fusionauth"},{"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%2Ffusionauth-senior-software-engineer-java-hybrid-denver-metro-preferred-fusionauth"},{"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/fusionauth-senior-software-engineer-java-hybrid-denver-metro-preferred-fusionauth\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Ffusionauth-senior-software-engineer-java-hybrid-denver-metro-preferred-fusionauth"}]}