{"id":3815506,"url":"https://alion.io/job/niko-technologies-middle-senior-node-js-developer-fintech-web3","title":"Middle / Senior Node.js Developer (FinTech / Web3)","company":{"id":4516476,"name":"Niko Technologies","domain":"niko-technologies.eu","url":"https://alion.io/company/niko-technologies","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Web3","role_family":"Web3","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Ukraine"],"countries":["UA"],"hiring_countries":["UA"],"hiring_countries_total":1,"salary":null,"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Clean Architecture","optional":false},{"name":"Docker","optional":false},{"name":"Go","optional":false},{"name":"Jest","optional":false},{"name":"Nest.JS","optional":false},{"name":"Node JS","optional":false},{"name":"PostgreSQL","optional":false},{"name":"RabbitMQ","optional":false},{"name":"Redis","optional":false},{"name":"Rest API","optional":false},{"name":"TypeScript","optional":false},{"name":"Apache Kafka","optional":true},{"name":"JavaScript","optional":true},{"name":"PCI DSS","optional":true},{"name":"Prisma","optional":true},{"name":"TypeORM","optional":true}],"status":"live","first_seen_at":"2026-11-05T13:33:02Z","employer_posted_date":null,"last_verified_at":"2026-11-05T13:33:02Z","board_verified":false,"closed_at":null,"days_open":2,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":2},"description":"Niko Technologies is an EU-licensed FinTech and Web3 product company. We develop specialized payment processing tools, digital card issuing, and crypto-fiat gateways for European businesses and individuals.\n\nFlagship products: securepaycard.com, elegro.eu.\n\nWe are looking for a Middle / Senior Node.js Developer to expand our backend team and work on high-load, compliant transaction processing systems.\n\nTech Stack:\n\nNode.js, TypeScript, NestJS, PostgreSQL, TypeORM / Prisma, Redis, Docker, CQRS / Event-Driven Architecture, RabbitMQ, Go (microservices), Jest.\nWhat you will do:\n\nArchitect, build, and optimize backend microservices handling financial transactions.\n\nDesign clean, modular, and type-safe code applying SOLID and Clean Architecture principles.\n\nScale data layer: query optimization, indexing, caching, and connection pooling.\n\nImplement fault-tolerant integrations with banking APIs and payment gateways.\n\nCover critical logic with automated tests and participate in code reviews.\nRequirements:\n\n3+ years (for Middle) / 5+ years (for Senior) of production experience with Node.js and TypeScript.\n\nSolid hands-on experience with NestJS (or modern structured Express).\n\nStrong knowledge of PostgreSQL (query execution plans, indexing strategies, transactions).\n\nPractical experience with Redis (caching, locking, pub/sub) and Docker.\n\nUnderstanding of microservices design patterns, RESTful APIs, and asynchronous message processing.\n\nGood grasp of automated testing (Jest, integration tests).\n\nEnglish: Intermediate (B1+) or higher.\nNice to have:\n\nExperience with message brokers (RabbitMQ or Kafka).\n\nHands-on experience or interest in writing services in Go (Golang).\n\nDomain knowledge in FinTech, Payment Processing, PCI DSS, or Blockchain / Web3.\n\nExperience with performance profiling, memory leak tracking, and distributed tracing.\nWhat we offer:\n\nFully remote work with flexible hours (no micromanagement).\n\nDirect impact on licensed EU FinTech products with real payment volume.\n\n100% company-funded professional courses, certifications, and conferences.\n\nTransparent communication, fast feedback, and healthy engineering culture.\nHiring Process:\n\nIntro call with Recruiter (30 mins).\n\nTechnical Interview with Tech Lead (60 mins, no live-coding trivia — real architecture and code discussion).\n\nFinal chat & Offer.\nReady to join? 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