{"id":2280784,"url":"https://alion.io/job/ultrafan-senior-full-stack-engineer","title":"Senior Full Stack Engineer","company":{"id":4407932,"name":"ULTRAFAN","domain":"ultrafan.world","url":"https://alion.io/company/ultrafan","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":{"grade":"A","score":100,"open_postings":3,"ghost_share":0,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-26T05:57:25Z"}},"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":"structured","locations":["Sofia, Bulgaria"],"countries":["BG"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":41000,"max_usd":78000,"period":"year","method":"role_seniority_country_cell","sample_n":8},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"Apache Kafka","optional":false},{"name":"Claude Code","optional":false},{"name":"Confluence","optional":false},{"name":"Cursor","optional":false},{"name":"GCP","optional":false},{"name":"JavaScript","optional":false},{"name":"Jira","optional":false},{"name":"Node JS","optional":false},{"name":"PostgreSQL","optional":false},{"name":"React Native","optional":false},{"name":"Redis","optional":false},{"name":"Redux","optional":false},{"name":"Rest API","optional":false},{"name":"Windsurf","optional":false},{"name":"CI/CD","optional":true},{"name":"React.js","optional":true}],"status":"live","first_seen_at":"2026-09-16T09:41:34Z","employer_posted_date":null,"last_verified_at":"2026-09-16T09:41:34Z","board_verified":false,"closed_at":null,"days_open":40,"trust":{"level":"ok","repost_count":1,"flags":[],"days_open":40},"description":"At ULTRAFAN, our mission is ambitious and impactful: Digitize and revolutionize professional sports clubs. We deliver cutting-edge tools to give our partners a competitive edge, on and off the field.\n\nWe’re scouting for a Senior Full Stack Engineer to join our team and help shape the Sports world. If you’re passionate about the future and want to work on innovative solutions, this is your chance!\n\nWhat You’ll Do\n\n• Develop and maintain top-tier mobile & web applications, backend services, and databases.\n\n• Work across the full stack to build scalable, secure, and user-friendly solutions.\n\n• Collaborate with Senior Developers, QAs, Tech Lead, CTO, UI/UX Designers, Product Managers, and DevOps.\n\n• Optimize applications for performance, scalability, and security.\n\n• Build and integrate RESTful APIs and third-party systems.\n\n• Work with Agile methodologies, using Jira & Confluence.\n\n• Assist in deployment, monitoring, and maintaining applications in GCP.\n\nWhat We’re Looking For\n\n• 6+ years of experience in full-stack development.\n\n• Backend proficiency in Node.js, working with Redis, Kafka and Message Brokers.\n\n• Experience with Microservice Architecture and Scalable System Design.\n\n• Experience with PostgreSQL and MongoDB (or alternatives)\n\n• Strong knowledge of RESTful APIs and external system integrations.\n\n• JavaScript/ES6+ skills with experience in ReactJS, Redux, React Native or alternative front-end frameworks.\n\n• Ability to write secure, optimized, and high-performance code.\n\n• Ability to investigate, trace and solve distributed-system problems.\n\n• Strong Abstract Thinking, System Design and Problem-Solving abilities\n\n• Comfort using AI-assisted development tools (e.g., Cursor, Claude Code, Windsurf) to improve productivity while maintaining code quality.\n\nNice-to-Haves\n\n• Experience in the FinTech industry.\n\n• Familiarity with DevOps practices and Google Cloud services.\n\n• CI/CD pipeline and automation experience.\n\n• Passion for learning and staying ahead of new tech trends.\n\nWhy Join Us?\n\n• Work on meaningful projects that impact the Professional Sports industry on a Global Level.\n\n• Collaborate with passionate, like-minded innovators.\n\n• Clear and efficient hiring process: 30-40 min call, then a follow-up interview.\n\nAre you ready to change the game? Let’s create the future of sports together. Apply now!\n\nThe position is hybrid, with focus on working from the office, which is located in Sofia.","description_format":"text","description_chars":2443,"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":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Sporting Goods","Consumer Internet Groups"],"lifecycle":[{"event":"open","at":"2026-10-11T11:16:15Z"},{"event":"close","at":"2026-10-14T23:16:00Z"},{"event":"reopen","at":"2026-10-22T11:19:50Z"}],"visa":[],"liveness":{"score":22,"band":"cold","label":"Long shot","p_open":0.6,"p_active":0.664,"p_room":0.55,"age_days":39,"expected_fill_days":28,"reasons":["seen:39","win:tail"],"computed_at":"2026-10-26T05:57:25Z"},"pay":null,"html_url":"https://alion.io/job/ultrafan-senior-full-stack-engineer","json_url":"https://alion.io/job/ultrafan-senior-full-stack-engineer.json","meta":{"generated_at":"2026-10-27T00:04:32Z","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":86,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-28T00:00:00Z"}},"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":4407932},"rest":"https://alion.io/mcp/rest/get_company?id=4407932"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fultrafan-senior-full-stack-engineer"},{"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%2Fultrafan-senior-full-stack-engineer"},{"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%2Fultrafan-senior-full-stack-engineer"},{"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/ultrafan-senior-full-stack-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fultrafan-senior-full-stack-engineer"}]}