Oleksandr R.

Fractional CTO | Only consultations available

🚀 Fractional CTO & Full Stack Developer | 12+ years building production systems for non-technical founders and scaling teams 💎 Top Rated Plus on Upwork ✅ 100% Job Success Score 🏛️ IEEE Senior Member 🇺🇸 O1A & EB-2 NIW Visa holder | US-recognized Extraordinary Ability 💰 $500K+ earned solo. I serve as Fractional CTO and full stack developer for early-stage startups — from architecture decisions to deployed product. 💻 React / NextJS / Redux / NodeJS / ExpressJS / NestJS / Svelte / SvelteKit / Supabase As a Fractional CTO I help non-technical founders make the right technical decisions — without the cost of a full-time hire. I own architecture strategy, vet and lead engineering teams, define build-vs-buy tradeoffs, and translate business goals into technical roadmaps with realistic timelines. I've served as Fractional CTO and full stack developer across fintech, edtech, recruitment, and e-commerce — owning the entire system as the sole technical decision-maker. Whether you need a Fractional CTO to lead your engineering org or a full stack developer to build everything from react js UI to nodejs API, I deliver both. Fractional CTO thinking and full stack developer execution — that's how I work, every engagement, every time. As a Fractional CTO and full stack developer I've shipped production-grade react js systems serving hundreds of thousands of users. I architect react js component systems, implement react js state management with Redux and context, and deliver TypeScript-typed, production-ready codebases. As a full stack developer and Fractional CTO I design nodejs backend services powering react js frontends, connecting to real-time APIs and databases through clean full stack architecture. I've operated as Fractional CTO and full stack developer across dozens of platforms — react js frontend, nodejs backend, end-to-end, solo. For a fintech client I served as Fractional CTO and sole full stack developer building a PayPal dispute automation tool: react js frontend, nodejs backend, next js-compatible architecture, and OpenAI ai integration for intelligent routing, dispute classification, and evidence summarization. The Fractional CTO-led system made analysts 3x faster and eliminated entire review categories. This is Fractional CTO work — end-to-end ownership, zero handoffs. For a global recruitment platform spanning 200,000 job postings and 150+ ATS integrations, I acted as Fractional CTO architect: white-label next js frontend with per-client branding, a nodejs backend coordinated tightly with the react js frontend. In another engagement I built a deep ai integration pipeline as Fractional CTO and sole full stack developer: nodejs embedded job data in a vector database, OpenAI powered semantic matching, and a react js next js frontend surfaced ranked results in real time. These are exactly the Fractional CTO and full stack developer challenges I take from zero to production. As Fractional CTO and full stack developer I build nodejs with the same discipline I apply to react js. I write nodejs REST APIs and lightweight GraphQL services with Express, MongoDB, PostgreSQL, Auth0, and OpenAI. Every nodejs service is built by a Fractional CTO who understands both the react js UI and the nodejs system it serves. I've deployed nodejs as full stack developer and Fractional CTO across fintech, edtech, and e-commerce. Clean nodejs architecture is non-negotiable for any Fractional CTO serious about full stack react js delivery. Frontend engineering is where I've built the deepest expertise as a Fractional CTO and full stack developer. I architect frontend systems with react js, next js, TypeScript, and Vite. Frontend work I've owned as Fractional CTO and full stack developer: react js retail dashboards for 24,000-SKU systems, global KYC platforms, climate education systems, civic government react js tools, and AI-powered platforms with full stack ai integration. Every frontend I ship is mobile-optimized, accessible, performance-audited, and built to scale. AI integration is now a standard part of every Fractional CTO and full stack developer toolkit. I've shipped ai integration across multiple engagements: RAG-based ai integration for semantic job matching on nodejs, OpenAI ai integration for financial dispute automation, ai integration in HR full stack tools, and ai integration in react js dashboards. Solid ai integration via OpenAI APIs and nodejs creates lasting value inside a reliable Fractional CTO architecture. Keywords: fractional CTO, full stack developer, react developer, nodejs full stack developer, senior react developer, fractional CTO react, full stack developer javascript, react js engineer, next js developer, typescript react, nodejs backend engineer, react frontend engineer, full stack, react developer node react, fractional CTO startup, technical advisor.