UI/UX Lead Developer

Roman Razumieienko

Crafting polished digital experiences with
15+ years of precision & care

About

A bit about me

I'm Roman, a UI/UX Lead Developer based in Odesa, Ukraine, with over 15 years of experience designing and delivering high-quality digital products. My work spans the full product lifecycle — from concept and strategy to implementation and continuous improvement.

Throughout my career, I've contributed to a wide range of projects, from bespoke digital experiences to complex, large-scale platforms. I've collaborated with clients across the U.S., Norway, Germany, and Austria, delivering tailored solutions in industries including healthcare, fintech, entertainment, gaming, telecommunications, and artificial intelligence.

I approach each project with a strong focus on user experience, product thinking, and execution quality. By aligning user needs with business goals, I help create intuitive, scalable solutions that deliver real impact. Whether leading a team or driving initiatives independently, I consistently deliver results — even under demanding timelines.

Experience

Where I've been

Lead Front-End Developer

NDA

Built a modular UI system for configurable AI agents and a client portal with real-time data. Delivered a rapid AI agent creation feature with white-label support, generating 150+ qualified leads. Implemented an embeddable widget and scalable white-label system for portal customization.

Senior Front-End Developer

MWDN

Architected a WEB3 application ecosystem using a monorepo, enabling efficient code reuse across multiple projects. Designed a custom UI component library and collaborated with backend engineers on API design. Led Agile adoption across the team.

Lead Front-End Developer

GetTechTalent

Provided consulting and development for clients including XXXLutz Group, aava swim, and Waterdrop. Collaborated in fully remote Agile teams, mentored team members, optimized workflows, and contributed to strategic decision-making.

Front-End Developer

IT SOURCES

Designed and developed responsive, animated websites with a focus on performance and UX. Improved frontend performance via code refactoring, lazy loading, and responsive design, boosting load speed and user engagement.

Lead Front-End Developer

Provectus

Built performant websites and applications for clients including Hilton, Ticketmaster, and Mercy Health. Led small-scale projects end-to-end, mentored developers, and acted as subject matter expert in responsive design, accessibility, and frontend architecture.

Front-End Developer

Ciklum

Developed an admin panel for dbtv.no and a community module for pressfire.no from scratch. Acted as Scrum Master, leading Agile ceremonies and fostering team collaboration. Managed timelines and ensured high-quality, on-time delivery.

Front-End Developer

Provectus

Supported high-traffic websites ticketmaster.com and livenation.com, ensuring performance and stability under heavy load. Led performance and SEO optimizations and refactored legacy code for improved maintainability.

JavaScript Developer

ABP

Developed and QA-tested the RDSbar Mozilla Firefox browser extension. Collaborated with Mozilla moderators on compliance and worked with SEO specialists and designers to enhance product functionality.

Chief Webmaster

Odessa National Mechnikov University

Designed and developed websites for university departments, supported onu.edu.ua, implemented SEO strategies, and led both back-end and front-end development for full-stack integration.

Skills

What I work with

Core Technologies

  • JavaScript
  • TypeScript
  • React
  • React Native
  • Next.js
  • Astro
  • Vue.js
  • Node.js
  • Lit
  • Backbone
  • jQuery

State & Data Management

  • Zustand
  • Redux
  • TanStack Query
  • Vuex
  • React Flow

UI & Styling

  • MUI
  • Mantine
  • Shadcn
  • Tailwind
  • Storybook
  • Design Systems
  • CSS
  • SCSS
  • Less
  • Stylus
  • PostCSS
  • CSS Modules
  • BEM
  • SUIT
  • SMACSS
  • Foundation
  • Bootstrap

UX & Accessibility

  • Figma
  • Responsive Design
  • Accessibility
  • Performance Optimization
  • SEO

Build Tools & Infrastructure

  • Vite
  • Webpack
  • Rollup
  • Turborepo
  • Rush
  • Monorepo Architecture
  • Gulp
  • Grunt
  • npm
  • yarn
  • pnpm

APIs & Integration

  • REST
  • GraphQL
  • Web Sockets

Testing & Quality

  • Spec Driven Development
  • TDD
  • BDD
  • Vitest
  • Jest
  • React Testing Library

Leadership & Process

  • Git
  • CI/CD
  • GitHub Actions
  • GitLab CI
  • Agile
  • Scrum
  • Architecture
  • Team Leadership
  • Mentorship
  • Code Review
  • Technical Consulting
  • Process Improvement
  • Documentation
Get in touch

Let's work together

Interested in collaborating, have inquiries, or simply want to connect? I welcome opportunities to work with clients, partners, and fellow professionals.