Mykhailo N.

I build systems that can't afford to fail — payments, financial data, third-party APIs, and the complex backend logic behind them. 14+ years in software development · 10+ years on Upwork · 200+ projects · $600K+ earned SELECTED RESULTS 🚀 Led development of a fintech platform processing live cross-border payments — building payment flows, provider integrations, and the core backend systems responsible for moving money reliably. 🚀 Led architecture and product development of an SEO analytics platform serving hundreds of active users. 🚀 Built a data-center site assessment platform that automates feasibility analysis and report generation — analysis that can cost up to $50K when commissioned traditionally, generated for under $1 in compute. 🚀 Built an e-commerce platform that has generated £80K+ in revenue for the client. WHAT CLIENTS HIRE ME FOR • Full-stack web applications and backend systems • Complex REST APIs and third-party integrations • Fintech, payments, trading, and financial-data systems • Workflow and business-process automation • SaaS product development • Debugging and stabilizing complex existing applications • Taking products from prototype to production HOW I WORK I take ownership. Give me an unfamiliar codebase and a business problem, and I'll map the system, identify what needs to change, explain the tradeoffs in plain language, and deliver working software. You won't need to manage me day-to-day. I communicate proactively, flag risks early, and care about how the system behaves in production — not just on the happy path. For payments, financial data, and other critical operations, I engineer defensively: idempotency, error handling, audit trails, concurrency safety, and failure recovery are built into the design. TECH STACK Node.js · TypeScript · JavaScript · Vue.js · React · PHP / Laravel · PostgreSQL · MySQL · MongoDB · Redis · AWS · REST APIs · Webhooks · Real-time systems · Git · CI/CD If you're building a complex product, integrating multiple systems, or fixing an application that isn't behaving reliably, send me a short description of the problem. I'll tell you honestly whether I'm the right fit.