{"id":3917701,"url":"https://alion.io/job/arrowfin-onsite-full-stack-engineer-node-js-react-fintech","title":"Onsite Full Stack Engineer (Node.js / React) – Fintech","company":{"id":4522991,"name":"ArrowFin","domain":null,"url":"https://alion.io/company/arrowfin","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Backend","role_family":"Backend","seniority":null,"employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Medellín, Colombia"],"countries":["CO"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Dependency Injection","optional":false},{"name":"Flyway","optional":false},{"name":"Jest","optional":false},{"name":"Nest.JS","optional":false},{"name":"Node JS","optional":false},{"name":"Playwright","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Prisma","optional":false},{"name":"React Router","optional":false},{"name":"React.js","optional":false},{"name":"Rest API","optional":false},{"name":"Supertest","optional":false},{"name":"TypeORM","optional":false},{"name":"TypeScript","optional":false},{"name":"Vitest","optional":false},{"name":"WebSockets","optional":false},{"name":"Docker","optional":true},{"name":"Grafana","optional":true},{"name":"Java","optional":true},{"name":"JavaScript","optional":true},{"name":"Prometheus","optional":true},{"name":"Spring Boot","optional":true}],"status":"live","first_seen_at":"2026-10-29T19:11:23Z","employer_posted_date":null,"last_verified_at":"2026-10-29T19:11:23Z","board_verified":false,"closed_at":null,"days_open":10,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":10},"description":"At\nArrowFin, we support the construction and optimization of high-performance\ntechnology solutions that power our clients' trading activities directly on the\nChicago Mercantile Exchange (CME). We develop our own software—no outsourcing\nor third-party client work—backed by an engineering team focused on real-time systems\nand distributed architecture. \nRole\nWe are\nhiring an Onsite Mid-Level Full Stack Engineer (Node.js / NestJS + React) for\nour office in El Poblado, Medellín. You will ship production code for our\nreal-time trading products, working closely with senior engineers who will\nsupport your growth.\nKey Responsibilities\nFull\nStack Development: Build and maintain backend services and REST APIs with\nNode.js, TypeScript and NestJS, and modern frontend interfaces with React and\nTypeScript.\nQuality:\nWrite unit, integration and E2E tests as part of every deliverable, and take\npart in code reviews.\nData\n& Real-Time: Write efficient PostgreSQL queries and migrations, respect\nmulti-tenant data isolation, and work with WebSocket-driven UI updates.\nCollaboration:\nTurn technical specs into working features, raise blockers early, and help\ntroubleshoot staging and production issues with the team.\nRequired\nStack & Qualifications\nHard\nRequirements\nLocation\n& Language: B2 or higher English proficiency. Based in or around Medellín,\nor open to relocating (onsite role).\nExperience:\n2–4 years of professional full stack web development.\nBackend:\nSolid experience with Node.js and TypeScript, ideally with NestJS (REST APIs,\nmodules, dependency injection, guards and pipes).\nFrontend:\nStrong React + TypeScript skills, plus hands-on experience with React Router\nand TanStack (Query / Table / Router).\nDatabase:\nWorking knowledge of PostgreSQL (queries, indexing basics, migrations with\nPrisma, TypeORM or Flyway).\no \nTesting:\nHabit of writing tests (Jest/Vitest, Supertest, React Testing Library;\nPlaywright is a plus).\nNice to Have\nExperience\nwith Java and Spring Boot. We run a polyglot backend and some services use\nSpring.\nExposure\nto WebSockets or event-driven systems.\nFamiliarity\nwith Clean / Hexagonal Architecture.\nBackground\nin Fintech, trading, or other regulated environments.\nDocker\nand basic observability tooling (Grafana, Prometheus).","description_format":"text","description_chars":2257,"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":["Financial Services"],"lifecycle":[{"event":"open","at":"2026-11-07T13:41:13Z"}],"visa":[],"liveness":{"score":78,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.829,"p_room":0.945,"age_days":9,"expected_fill_days":25,"reasons":["seen:9","win:mid"],"computed_at":"2026-11-08T05:47:12Z"},"pay":null,"html_url":"https://alion.io/job/arrowfin-onsite-full-stack-engineer-node-js-react-fintech","json_url":"https://alion.io/job/arrowfin-onsite-full-stack-engineer-node-js-react-fintech.json","meta":{"generated_at":"2026-11-09T01:49:29Z","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":3820,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-10T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.1,"usd":0.01,"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":4522991},"rest":"https://alion.io/mcp/rest/get_company?id=4522991"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Farrowfin-onsite-full-stack-engineer-node-js-react-fintech"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":2,"usd":0.2},"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%2Farrowfin-onsite-full-stack-engineer-node-js-react-fintech"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.1,"usd":0.01},"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%2Farrowfin-onsite-full-stack-engineer-node-js-react-fintech"},{"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/arrowfin-onsite-full-stack-engineer-node-js-react-fintech\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Farrowfin-onsite-full-stack-engineer-node-js-react-fintech"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3917701}},{"tool":"search_jobs","arguments":{"company":4522991,"detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3917701},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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