Contact information

You can get this candidate's contact information from https://www.work.ua/resumes/5765508/

Work experience

Front-end developer

from 04.2021 to 07.2022 (1 year 4 months)
ETNA Network, Дистанційно (IT)

Built lightweight, responsive, and pixel-perfect UI components for a comprehensive Web3/Crypto ecosystem.

Developed frontend interfaces using Alpine.js and Tailwind CSS, ensuring fast load times and clean component architecture.

Delivered key platform modules and decentralized user flows:

* DeFi & Utilities: Staking platforms, Cross-chain Bridge (BSC ↔ Polygon/Matic), Token Sales, and Airdrop portals.

* NFT & GameFi: NFT marketplace/shop UI, Play-to-Earn (P2E) web applications, and launch countdown modules.

* Marketing: High-converting promo landing pages optimized for performance and mobile responsiveness.

* Collaborated closely with designers and blockchain developers to deliver seamless user experiences.

Tech stack: Alpine.js, Tailwind CSS, JavaScript (ES6+), Web3/Crypto UI, HTML5/SCSS, Responsive & Mobile-First Design.

Web-програміст

from 02.2019 to 11.2020 (1 year 10 months)
Lexstatus, Дистанційно (Будівництво, архітектура, дизайн інтер'єру)

* Developed and maintained corporate websites and marketing landing pages using WordPress and Joomla.

* Optimized web performance, SEO structure, and Core Web Vitals, achieving 95+ Performance scores on Google PageSpeed Insights.

* Implemented responsive, pixel-perfect, and mobile-first layouts designed to boost conversions.

* Configured on-page technical SEO, analytics tracking, and marketing tools integration.

Tech stack: WordPress, Joomla, HTML5/SCSS, JavaScript, Technical SEO, Web Performance (95+).

Fullstack Developer

from 06.2018 to now (8 years 5 months)
Upwork, Дистанційно (IT)

Technical Expertise & Stack

* Core & Architecture: TypeScript (Strict typing), React, Next.js (App & Pages Router, Server Components, API Routes), Modular/Feature-Sliced Architecture, Clean Code practices.

* Complex State & Data Layer: TanStack Query (React Query — caching, optimistic updates, pagination), Zustand, Redux Toolkit, Context API, WebSockets / Polling for real-time data sync.

* Data-Heavy UI & Enterprise Components: Complex multi-step forms (React Hook Form, Zod/Yup validation), Virtualized tables & data grids (TanStack Table), Custom Design Systems & Component Libraries, Tailwind CSS, Headless UI.

* API Integration & Data Contracts: REST APIs, GraphQL, Swagger/OpenAPI contracts, Axios/Fetch interceptors, error-handling middleware, file upload/export flows (CSV/PDF/Excel).

* Security, Auth & RBAC: Role-Based Access Control (RBAC), JWT / Session-based auth flows, protected routing, secure token storage & refresh mechanisms.

* Performance & Optimization: Profiling and optimizing render cycles for heavy interfaces, memory leak prevention, memoization strategies, code splitting, bundle size tuning.

* Backend & Tooling: Node.js basics (API middleware, integrations), Git/GitHub (feature branches, PR reviews), CI/CD workflows, Unit/Integration testing basics.

My Profile:
https://www.upwork.com/freelancers/irynavynnychenko

Education

КНЕУ им. В.Гетьмана

Финансы, Киев
Higher, from 2010 to 2017 (7 years)

Additional education and certificates

Dan.IT Education Frontend JavaScript Developer

2020

ProCode IT FullStack Developer

2019

Vercel: Next.js App Router Fundamentals

09.2026, 1 місяць
Certificate

FreeCodeCamp: Responsive Web Design

09.2025

Vercel: React Foundations for Next.js

09.2026

Knowledge and skills

• Python
• TypeScript
• JavaScript
• SQL
• Продуктивність
• Уміння аналізувати
• Відповідальність за результат
• Організованість
• Проактивний підхід
• Робота з великим обсягом інформації
• Уміння працювати в режимі багатозадачності
• MS Excel
• Здатність до навчання
• Бажання вчитися і розвиватися
• Уважність

Language proficiencies

• English — above average
• Ukrainian — fluent

Additional information

I was working for 5 years as part-time Frontend developer in this project: https://pvtistes.net/.

I converted Figma designs into HTML/CSS (SCSS) pages and also developed PHP templates and backend logic, integrating the frontend with the PHP-based application:
- https://pvtistes.net/infos-recits/
- https://pvtistes.net/le-pvt/australie/
- https://pvtistes.net/en/working-holiday-visa/
- https://pvtistes.net/en/dossiers/
- https://pvtistes.net/en/pvtistes-events/

Business website for cosmetologist from Germany (Next.js + TailwindCss): https://www.niunkina.com/

https://whvaustralie.com/ - TailwindCss + Javascript;
https://plowguys.com/ - Figma to Webflow (with custom Javascript code);
https://massageschool.com.ua/

My own website on Next.js & TailwindCss:
https://vynnychenko.dev/

NDA-projects

Client names and links are withheld under NDA.

* Focus: scalable infrastructure for production SaaS and enterprise platforms.
* Multi-tenant SaaS CRMs and admin platforms built with Next.js + PostgreSQL/Prisma - featuring RBAC, robust data isolation, and architectures designed to scale from dozens to thousands of users.
* High-traffic web delivery: SSR/SSG/ISR, CDN caching (CloudFront / Vercel Edge), code splitting, and Core Web Vitals optimization under load.
* AWS Serverless (S3, CloudFront, Amplify): preview and production environment isolation, CI/CD pipelines, and reproducible deployments.
* Scalable API backends (Node.js, REST/GraphQL) integrated with TanStack Query - caching, retry logic, and optimistic UI for production applications.