React & Next.js Frontend
SPAs, server-rendered pages, static sites with ISR, micro-frontends, design system integration, and accessibility audits. Every project targets Lighthouse 90+ across all metrics.
Available for new projects
Illya Pihovych
Illya Pihovych
Upwork_ & AI Engineer
I architect and ship production-grade full-stack applications, AI-powered automation tools, cross-browser extensions, and resilient server infrastructure. From component to deployment — one commit at a time. 50+ projects delivered on Upwork.
~/illya-pihovych — bash
$ whoami
Full-Stack Developer / AI Engineer
$ uptime --projects
50+ production deployments · 5+ years · 100% Job Success
$ stack --tech
React Next.js Node.js TypeScript AI/LLM Docker Linux
$ _
// tech_stack
Production-grade tools and frameworks I use daily — every icon represents a technology I have shipped to production across multiple Upwork contracts.
React
SPAs, server components, custom hooks, state management, component libraries, and performance profiling for complex user interfaces at scale.
Next.js
App Router, RSC, ISR, middleware, edge runtime, API routes, SEO metadata, and i18n — my default choice for production web applications.
Node.js
Express, Fastify, REST API design, WebSocket servers, background job processing, file handling, and authentication architectures.
TypeScript
Strict mode, generics, branded types, full-stack type sharing with tRPC or GraphQL codegen, and exhaustive type safety across the entire stack.
AI & LLM Integration
OpenAI, Anthropic, LangChain, RAG pipelines, vector search with Pinecone and pgvector, prompt engineering, streaming responses.
Browser Extensions
Chrome Manifest V3, Firefox WebExtensions, content scripts, service workers, storage APIs, OAuth flows, and cross-browser publishing.
Server Administration
Linux, Nginx, Docker Compose, VPS provisioning, Cloudflare setup, CI/CD pipelines, monitoring, backup automation, security hardening.
Databases & API
PostgreSQL, MongoDB, Prisma, Drizzle, Redis, RESTful API design, GraphQL, webhook systems, Stripe and OAuth integrations.
// services
Six engineering capabilities I offer as standalone services or combined into full-stack delivery. Every engagement includes clean code, written communication, and production deployment.
Node.js Backend & API
REST and GraphQL APIs with OpenAPI documentation, PostgreSQL or MongoDB persistence, JWT and OAuth2 authentication, rate limiting, and structured error handling.
Full-Stack Applications
End-to-end development from schema design to CI/CD deployment. Monorepo architecture, Docker Compose local dev, automated testing, and production monitoring included.
AI Development & Automation
OpenAI and Claude API integration, RAG pipelines with vector databases, automated content generation, chatbot systems, and intelligent document processing workflows.
Browser Extensions
Chrome MV3 and Firefox extensions with content script injection, background workers, storage sync, cross-browser testing, and Chrome Web Store submission handling.
DevOps & Server Admin
Ubuntu VPS hardening, Nginx reverse proxy with SSL, Docker Compose orchestration, GitHub Actions CI/CD, monitoring with uptime checks, and automated backup strategies.
// metrics
Verified track record from five years of full-stack and AI development across Upwork and direct contracts.
62
Projects shipped to production
6
Years of professional engineering
100%
Upwork Job Success Score
34
Unique clients served
// featured_projects
A curated selection of production applications I built from the ground up. Each project represents a distinct engineering domain.
AI Content Engine
GPT-4 powered platform with RAG, brand voice profiles, bulk generation, and automated publishing schedules. Used by a content agency processing 200+ articles monthly.
Next.js
OpenAI
RAG
PostgreSQL
View AI services →
Multisite Generator CLI
Static site generator that transforms JSON prompts into fully deployed HTML/CSS sites across Firebase, Cloudflare, Vercel, Netlify, and Surge — all from a single command.
Node.js
CLI
Firebase
DevOps
sysadm.pp.ua →
ScreenSnap Extension
Cross-browser screenshot tool with full-page capture, annotation canvas, blur tool, cloud upload, and clipboard copy. Published in Chrome and Firefox stores — 5k+ active installs.
Chrome MV3
Firefox
Canvas API
TypeScript
View extension work →
// testimonials
Unedited feedback from Upwork clients — product managers, startup founders, and engineering leads who have hired me for technical delivery.
"Illya built a complex AI automation pipeline that processed unstructured documents into structured data. The code was modular, fully typed, and came with integration tests covering every edge case. He communicated technical decisions clearly and delivered two weeks ahead of schedule."
"We needed a full-stack MVP from scratch — React dashboard, Node.js API, PostgreSQL, and Docker deployment. Illya handled everything including the CI/CD pipeline. What stood out was his ability to push back on unclear requirements and propose better solutions. Rare on Upwork."
"Illya developed a Chrome extension for our internal CRM integration. The extension went through Chrome Web Store review on the first submission — that never happens. He also provided documentation for our team to maintain it. Professional, precise, and reliable."
Ready to ship something_
Whether you need a full-stack application, an AI integration, a browser extension, or a production server — I will provide a clear technical proposal and timeline within 24 hours. No fluff, just engineering.