# Iryna Vynnychenko

> Iryna Vynnychenko, senior UI engineer & full stack developer in Kyiv. React and Next.js for SaaS, MVPs, and Telegram Mini Apps. 8+ years in production, 4,200+ Upwork hours, 100+ launched projects.

Iryna Vynnychenko (Ірина Винниченко) is a Senior UI Engineer & Full Stack Developer (React, Next.js) in Kyiv, Ukraine. Available for remote B2B contracts globally.

## Identity

- Name: Iryna Vynnychenko / Ірина Винниченко
- Role: Senior UI Engineer & Full Stack Developer (React, Next.js)
- Location: Kyiv, Ukraine
- Site: https://vynnychenko.dev
- Email: i.vynnychenko@gmail.com
- Profiles: https://www.linkedin.com/in/iryna-vynnychenko-287202141/, https://www.upwork.com/freelancers/irynavynnychenko, https://github.com/irynavynnychenko

## Services

- [Website development](https://vynnychenko.dev/website-development/): I build marketing sites as a senior web engineer — Next.js, WordPress, or Webflow. The stack follows the job: custom and fast, weekly publishing, or pages you edit without a deploy. Direct contractor, not an agency. 8+ years in production, 4,200+ Upwork hours.
- [Web app development](https://vynnychenko.dev/web-apps/): I build web apps as a senior web engineer — Next.js, React, APIs, PostgreSQL. This is not a marketing site: login, state, payments, ops. Direct contractor, not an agency. 8+ years in production, 4,200+ Upwork hours.
- [Telegram Mini App development](https://vynnychenko.dev/telegram-mini-apps/): I build Mini Apps and payment bots as a senior web engineer — Next.js, React, webhooks, Stripe / LiqPay / Monobank / TON. Direct contractor, not an agency. 8+ years in production, 4,200+ Upwork hours.
- [AI solutions for business](https://vynnychenko.dev/ai-solutions/): I wire AI into an existing product: RAG on your documents, agents that call tools with a human on the rejects, CRM / ops hooks, and a Next.js UI. 8+ years shipping software, 4,200+ Upwork hours.

## Key pages

- [Home](https://vynnychenko.dev/)
- [Experience](https://vynnychenko.dev/experience/)
- [Contacts](https://vynnychenko.dev/contacts/)
- [Blog](https://vynnychenko.dev/blog/)
- Ukrainian: https://vynnychenko.dev/ua/
- German: https://vynnychenko.dev/de/
- French: https://vynnychenko.dev/fr/
- Spanish: https://vynnychenko.dev/es/
- Italian: https://vynnychenko.dev/it/
- Turkish: https://vynnychenko.dev/tr/

## Selected writing

- [A Pixi.js Game You Can Play](https://vynnychenko.dev/blog/pixijs-animated-game-nextjs/): The last article was the 3D object. This one is the 2D stage. Catch the fruit. Dodge the rotten ones. The GPU keeps the sprites at 60 fps; the score under it stays HTML. How I wire a branded minigame as a Next.js island — and why Pixi is still not a game engine.
- [A Three.js Object You Can Orbit](https://vynnychenko.dev/blog/threejs-product-scene-nextjs/): The last article was when I would leave the DOM. This one is the object. Drag it. Switch glass to chrome. The GPU paints the SKU; the copy around it stays HTML. How I wire that island in Next.js — and why it still does not live on the homepage.
- [Google Rank Is Not Enough - ChatGPT Has to Cite You Before the Customer Clicks](https://vynnychenko.dev/blog/geo-chatgpt-citations-for-business-2026/): Buyers now ask ChatGPT, Perplexity, and Google AI Overviews who to hire. Ranking on Google does not put your name in that answer. What GEO actually is, why a JS-only site is invisible, and what I put on a page so a model can cite it.
- [What SEO Actually Is - and Why a Site Without It Misses the Buyer Who Already Typed the Job](https://vynnychenko.dev/blog/what-is-seo-and-why-it-matters/): SEO is not keywords in the footer and not a plugin. It is making a page findable when someone already typed the job into Google. What that actually means, why ads and Instagram do not replace it, and what I put on a site so a crawler can rank it.
- [What a Telegram Mini App Actually Is - and When I Would Build One](https://vynnychenko.dev/blog/what-is-telegram-mini-app/): A Mini App is a web product that runs inside Telegram - not a bot, not a native app. How it is wired, how initData auth actually works, the UX constraints that kill a pasted website, and when I would ship one instead of a site.
- [A One-Page Site for Solo Work: Tutor, Nail Tech, Four-Table Cafe](https://vynnychenko.dev/blog/why-even-smallest-business-needs-website-2026/): A tutor, a nail tech, a four-table cafe: you do not need a 40-page portal. You need one fast page you own - because Instagram, Telegram, and Maps are rented, and strangers check you before they pay.
- [Hours, Trust, and More Orders: What a Shop or Clinic Site Actually Buys an SMB](https://vynnychenko.dev/blog/website-for-smb-business-benefits/): A site is not a status page. For an SMB it is a 24/7 sales desk, a Google listing you own, and a way to grow the number of people who actually order - not only those who already know you from a feed.
- [An Agent Acts. A Chatbot Answers. Do Not Give the Model the Till](https://vynnychenko.dev/blog/ai-agent-vs-chatbot-for-small-business/): A chatbot produces text. An agent calls tools - books a slot, sends an invoice, hits an API. What a ten-person company can bound this month, what must stay behind a human confirm, and how I would wire that in Next.js after this summer’s agent-security news.
- [An LLM in a Paid Workflow: Tickets, Emails, and PDFs Become a Step a Human Can Audit](https://vynnychenko.dev/blog/what-is-an-llm-in-business/): An LLM in business is not “we have ChatGPT.” It is a model that turns language - tickets, emails, PDFs - into a step a paid workflow can run, with a human on the edge cases.
- [How I Would Build an MVP - and How I Actually Pick the Stack](https://vynnychenko.dev/blog/how-i-build-mvp-and-choose-tech-stack/): A practical playbook: what an MVP is (and is not), the five filters I use to pick technology, a default 2026 web stack, and what I refuse to add before the first real users.
- [Core Web Vitals: Why Website Speed Directly Affects Revenue](https://vynnychenko.dev/blog/core-web-vitals-and-revenue/): Google measures user experience - and so do your customers. Learn how performance metrics tie to real business outcomes.
- [From First Call to Launch: How a Freelance Web Engagement Actually Runs](https://vynnychenko.dev/blog/working-with-freelance-web-developer/): A transparent look at the process - from first call to launch and ongoing support - so you know exactly what you are signing up for.
- [Telegram Mini Apps Worth Copying in 2026: Product Patterns, Not Clicker Clones](https://vynnychenko.dev/blog/telegram-mini-app-product-patterns-2026/): The interesting Mini Apps in 2026 are not Hamster copies. Seven product patterns I would actually steal: group-native tools, a dual PWA door, exclusive drops, internal ops, one-job AI, matching without a fleet, and Stars as the receipt - not the product.
- [Website Payments in 2026: Checkout, Payment Link, and a Thank-You Page That Does Not Lie](https://vynnychenko.dev/blog/accept-payments-on-website-2026/): A card number in chat is not a checkout. How a site you own takes money: payment link or landing, Apple Pay on a phone, fiscal PDF on thank-you - and why /success must not mark the order paid.

Full article list: https://vynnychenko.dev/llms-full.txt
RSS: https://vynnychenko.dev/rss.xml