Vitalii Stefaniv

Remote Senior Full-Stack or Backend role on a product team where engineers own technical decisions. Stack: TypeScript, Node.js/NestJS, React/Next.js, PostgreSQL; also Java/Spring. Most excited by AI features, SaaS, payments, high-load and event-driven systems. Based in Czechia (CET), open to US overlap. Full-time or long-term contract. Full-stack developer with 6+ years of commercial experience. Core stack: TypeScript, Node.js (NestJS), React/Next.js and PostgreSQL; equally comfortable with Java and Spring Boot. I enjoy products with real complexity behind them: AI-powered features, multi-tenant SaaS, access control, payments and event-driven systems. Looking for a remote Senior Full-Stack or Backend role on a product team where engineers own technical decisions. Based in Czechia (CET), happy to overlap with US or other time zones; full-time or long-term contract. At Knostic AI, I worked on an enterprise AI security platform that helps prevent knowledge oversharing and undersharing in LLM-powered tools. The platform served 10+ enterprise customers, supported 4+ AI-tool integrations, and handled 10K+ access checks per day. Across three interconnected healthcare education and hiring platforms under NDA, I improved student–preceptor matching and helped cut result generation time by 30%. I also developed an automated matching system using an event-driven microservice architecture with 8+ services, processing 10K+ matches per month. At Cypress Lawn, I contributed to a portal and customer care center platform for family services. At DubaiNight, I contributed to venue and event listings, search, user profiles, and CMS features for offers and news.