Full Stack AI Engineer | AI automation
SaaS, FinTech, E-commerce, EdTech, AI products, CRM / ERP, Healthcare, Travel, Media, Social, Developer tools, Cybersecurity, Marketplace, Logistics
Available for remote B2B contracts globally
Iryna Vynnychenko
Full Stack AI Engineer | AI automation
Iryna Vynnychenko, Senior Full Stack AI Engineer in Kyiv. React and Next.js for SaaS, MVPs, and Telegram Mini Apps. 8+ years in production, 4,200+ Upwork hours, 100+ launched projects.
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Hire me for
Sites, web apps, Mini Apps, and AI - shipped as a senior engineer, not an agency handoff.
AI solutions for business
RAG on your data, agents with a human confirm, CRM hooks – ROI, not a demo chatbot.
Figma UI/UX Design & AI Prototyping
UI/UX design, interactive Figma prototypes, design systems, and rapid design-to-code using Figma Make and Claude Cowork.
Web app development
Product UIs on Next.js and React – dashboards, accounts, booking, checkout.
Telegram Mini App development
Mini Apps, payment bots, booking, shops – Next.js inside Telegram.
Website development
Marketing sites on Next.js, WordPress, or Webflow – stack from the job, not from a trend.
About
Senior Full Stack AI Engineer & Solutions Architect: Custom AI Agents, Telegram Mini Apps, Web Applications & AI Automation.
Video Introduction
💡 Intro video recorded during my Frontend services period — demonstrates my communication style & client-first approach. My current primary stack (Full Stack AI & Automation) is detailed on this site.
Architecting 0 → Production AI solutions and high-performance full-stack web applications. I deliver custom AI agents, LLM integrations (OpenAI, Anthropic, Gemini, DeepSeek), Telegram Mini Apps, and scalable Next.js/React web platforms with 100% personal accountability.
Senior Full Stack AI Engineer & Solutions Architect. High-performance AI products & web platforms in production.
What I Deliver & Engagement Models
- 8+ years in production: AI Solutions, Full-Stack SaaS, Telegram Mini Apps & Web Platforms (4,200+ Upwork Hours)
- Senior AI Engineer & Architect: Custom Autonomous AI Agents, RAG Knowledge Bases, Agentic Workflows, LLM Integration & Streaming UI
- Available for Long-Term Collaboration: Full-Time or Part-Time Contracts (30–40 hrs/week) & Milestone Projects
- Solo Developer (No Agency): 100% accountability. Direct communication, remote B2B contracts globally, NDA-ready
Stack
Core Frontend & Architecture
- TypeScript, JavaScript (ES6+), React, Next.js, Angular, Vue.js
- Tailwind CSS, SCSS, shadcn/ui, GSAP, Lottie, Google Maps API
- Svelte, Alpine.js
- Pixel-Perfect UI development, design systems & accessible (a11y) UI kits
- Webflow, WordPress, static generation (SSG / HTML)
Backend & Databases (Complex Backend)
- Node.js, Python, Flask, PostgreSQL, Prisma ORM
- Docker (Containerization)
- API Integration & Orchestration (REST / GraphQL)
AI Integrations & Features
- Vercel AI SDK
- Figma-to-Code via MCP
- Streaming UI (SSE / WebSockets)
- AI-assisted development & AI-powered internal tools
- Multimodal AI
AI Automation & Agentic Workflows
- AI agents, workflow automation & business process automation
- Human-in-the-loop validation & API orchestration
- Automated data processing & context engineering
- Tool / function calling & structured outputs
- Embeddings & vector databases
LLM Integrations
- OpenAI & Anthropic APIs
- Prompt engineering & structured outputs
- Function / tool calling & embeddings
- Vector databases & context management
- AI agents & multimodal AI
State & Data
- React Query / TanStack Query, Redux, Zustand
- GraphQL, REST APIs (JSON / Data Parsing)
- ECharts.js & data visualization
Performance & Architecture
- SSR / SSG / ISR / CSR
- Core Web Vitals optimization
- Bundle size & load-time reduction
- i18n / Multilingual architecture & SEO
Testing & Workflow
- Git / GitHub, CI/CD
- AWS Cloud Infrastructure (S3, CloudFront, Amplify / Serverless)
- Vercel, Netlify, VPS servers
- Jest, React Testing Library, Playwright
- AI-augmented tooling: Claude Code MAX subscription, Gemini, Codex, Cursor IDE
Projects(100+)
- Multi-tenant product systems on Next.js + PostgreSQL/Prisma - isolated data, built to grow from dozens to thousands of users
- High-traffic delivery: SSR/SSG/ISR, CDN caching (CloudFront / Vercel Edge / VPS), code splitting, Core Web Vitals under load
- AWS serverless: S3, CloudFront, Amplify - preview vs production isolation, CI/CD, repeatable deploys
- API backends at scale (Node.js, REST/GraphQL) with TanStack Query - cache, retries, and optimistic UI for live products
Selected public work
Certificates & Diplomas(9)
Build Your Own AI Coding Agent Harness
Building with the Claude API
Responsive Web Design
JavaScript
Next.js SEO Fundamentals
Next.js Pages Router Fundamentals
React Foundations for Next.js
Next.js App Router Fundamentals
Responsive Web Design
Client Testimonials
“Iryna turned our Figma design into a live page flawlessly and ahead of schedule.”
Independent contractor since 2018
Frequently Asked Questions
Answers to common questions about working together
What is your typical project workflow?
For a marketing site we start from the brief or Figma. For product work we start from the domain: business rules, data model, existing APIs. Then architecture, milestones, iterative delivery with daily updates, QA, and deploy. You work with me directly - no middle managers.
Do you work under NDA (Non-Disclosure Agreement)?
Yes, absolutely. I value my clients' security and intellectual property. I am fully ready to sign a standard NDA before we discuss any confidential project details or share source code.
Which technologies do you specialize in?
Core Frontend & Architecture: TypeScript, React, Next.js (App Router, Server Components/Actions), Vue.js, Angular, Svelte, Alpine.js, Webflow, WordPress, Tailwind CSS, GSAP, Lottie, Framer Motion. Backend & Databases: Node.js, Python, Flask, PostgreSQL, Prisma ORM, REST/GraphQL, Docker. AI & Automation: Custom AI Agents, RAG Knowledge Bases, Vercel AI SDK, OpenAI, Claude, Gemini, DeepSeek, Vector DBs, Human-in-the-loop workflows. State & Cloud: TanStack Query, Zustand, AWS, Vercel, CI/CD.
How do we get started?
We can schedule a video call or chat via Upwork/Telegram/WhatsApp to discuss your project scope. Once we align on requirements, I can provide a fixed-price estimate or start on an hourly basis.
Do you work with Ukrainian companies as a registered private entrepreneur?
Yes, absolutely. I am officially registered as a private entrepreneur (Group 3) in Ukraine, meaning we can sign an official contract for web development services, issue invoices, and sign acceptance acts.
How do you drive value (Scope & Leadership)?
Architecture & MVPs, performance optimization, mobile & cross-browser reliability, design systems, full-stack debugging, and AI-augmented backend engineering.
- Architecture & MVPs: Scoping and launching scalable web products from zero to production.
- Performance: Auditing legacy code, cutting bundle sizes, and maxing out page speed.
- Mobile & Cross-Browser Reliability: Responsive, consistent experiences across devices, browsers, and screen sizes.
- Design Systems: Building reusable, accessible (a11y) UI kits for complex apps.
- Full-Stack Debugging: Tracking down and fixing production issues across frontend & backend.
- AI-Augmented Backend & Agentic Workflows: Leveraging Claude Code MAX, Gemini, Codex & Cursor to accelerate secure API, microservice, and database execution with human-in-the-loop validation and TDD.
Why do clients choose you?
8+ Years | 4,200+ Upwork Hours, Team Player, Solo Developer accountability, and Product-Minded execution.
- 8+ Years | 4,200+ Upwork Hours: Reliable, top-rated expertise.
- Team Player: A reliable frontend partner for Backend & ML engineers and teams.
- Solo Developer (No Agency): 100% accountability. Fast syncs, direct communication, NDA-ready.
- Product-Minded & Business-Driven: Combining strong engineering with a Product Engineer mindset to directly impact product metrics.
What do you build?
Available for end-to-end development or jumping in at any stage:
- SaaS Products & Web Platforms
- AI-Powered Applications & AI Tools
- AI Agents & Autonomous AI Systems
- AI Chatbots, Conversational AI, AI Assistants & AI Copilots
- Custom CRMs, Sales Platforms, Admin Dashboards & Back-Office Systems
- Marketplaces, Multi-Sided Platforms, FinTech & Real Estate Platforms
- Analytics, Reporting, Data Visualization, Booking & Scheduling Systems
- Workflow Automation, Internal Business Tools, E-commerce & Subscription Platforms
- High-Performance SEO Web Applications & MVPs from 0 → Production
Let's work together
SaaS, MVPs, and product UI on React and Next.js. Scope and timeline on a short call.