Sergey

SERGEY DUDKA
Senior Frontend Developer | React | Next.js | TypeScript
Dnipro, Ukraine | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація»)
Live Production Platforms: motorsport.com | autosport.com | motorsportnetwork.com | drivenlifestyle.com | deka.ua

PROFESSIONAL SUMMARY

Hands-on Senior Frontend Developer with 10+ years of commercial experience delivering user-centric, high-performance
web applications alongside cross-functional product, design, and backend teams. Passionate about solving everyday product
problems and writing clean, maintainable code just as much as building scalable systems. Deep technical expertise in React,
Next.js, TypeScript, TanStack Query, and architectural patterns (Feature-Sliced Design / FSD, Clean Architecture).
Proven track record: slashed LCP by 40% via Critical CSS pipelines, built 25+ shared widgets across 6 brands, and scaled
platforms across 13 regional editions. Strong focus on practical team collaboration, automated component testing (Vitest,
Jest, RTL), and reliable CI/CD delivery.

TECHNICAL SKILLS
Frontend Core: React, Next.js, TypeScript, JavaScript (ES6+), TanStack Query, Tailwind CSS, HTML5, CSS3, Redux Toolkit,
React Hook Form, Zod, React Router, Custom Hooks, Responsive Design
Architecture & Patterns: Feature-Sliced Design (FSD), Clean Architecture, Domain-Driven Design (DDD) principles, Design
Systems, Reusable Component Libraries, Micro-frontends, pnpm Monorepo, Storybook
Testing & Quality: Vitest, Jest, React Testing Library, Visual Regression Testing, Code Reviews
Build Tools & Tooling: Turborepo, Vite, Webpack 5, Gulp, PostCSS, D3.js, Chart.js
Performance & Real-Time: Core Web Vitals Optimization, Automated Critical CSS Pipeline, WebSockets, Server-Sent Events
(SSE), Long Polling, Bundle Splitting & Tree Shaking, Lazy Loading, GPU Compositing
DevOps, Backend & CMS: Git, GitHub Actions, GitLab CI, CI/CD Pipelines, Docker, Node.js, Express.js, PHP 5.6+ (OOP,
MVC), Yii2, WordPress, OpenCart, RESTful APIs, PostgreSQL, MongoDB
Analytics & Marketing Tech: Google Tag Manager (GTM), Data Layer & Custom Events, UTM Campaign Tracking &
Attribution, Tracking Pixels (Meta, Google), Piano Paywall, GDPR / Consent, SEO & Schema.org, AMP, i18n & RTL Support
(13+ locales)

WORK EXPERIENCE

Senior Frontend Developer - Motorsport Network 06/2018 - 05/2026 (7 yrs 11 mos) | Remote
Live Platforms: motorsport.com | autosport.com | motorsportnetwork.com | drivenlifestyle.com | dupontregistry.com
Design System & Component Library: Architected shared component library in pnpm monorepo across 6 brand projects,
delivering 25+ reusable widgets that cut cross-brand deployment time by 40% across 13 markets. Applied Feature-Sliced
Design (FSD) and Clean Architecture principles. Led 3 platform evolutions: jQuery -> Web Components -> React/Next.js with
TypeScript, TanStack Query, and Tailwind CSS.
Real-Time UI & State Management: Built live race interfaces for F1, MotoGP, and NASCAR (Race Center, Race Hub, Live
Timing). Implemented WebSocket streaming with resilient polling fallback, TanStack Query for server state cache, and
custom reactive stores handling 60+ updates/second with zero layout shifts.
Performance & Core Web Vitals: Engineered an automated Critical CSS pipeline (695+ files per deploy) that slashed LCP
by 40%. Enforced bundle splitting and tree shaking to decrease JS payload by 30%, achieving a 90%+ Core Web Vitals pass
rate and driving a 35% increase in organic mobile traffic.
Testing & CI/CD Automation: Authored comprehensive component test suites using Vitest, Jest, and React Testing Library.
Established CI/CD workflows via GitHub Actions and GitLab CI for automated linting, test execution, visual regression
checks, and seamless releases across 13 regional editions.
Marketing Integrations, Analytics & Platform: Architected complete telemetry and tracking layer using Google Tag
Manager (GTM) with custom Data Layer events, UTM campaign attribution, and marketing pixels (Meta, Google Ads).
Delivered 13+ regional editions with full Arabic RTL support, Piano paywall integration, ad vendor SDKs (Spring Media,
Stroer), and strict GDPR consent workflows.
Technical Leadership & Mentorship: Spearheaded frontend RFC proposals for Critical CSS and real-time state
management. Conducted daily code reviews across repositories and mentored 2 junior frontend engineers, accelerating
team delivery and maintaining strict code quality standards.

Senior Fullstack Developer - DEKA 09/2016 - 06/2018 (1 yr 10 mos) | Dnipro, Ukraine
Live Storefront: deka.ua (Leading Ukrainian e-commerce jewelry and watch retailer)
E-Commerce Platform Architecture: Engineered fullstack storefront and administrative CMS for deka.ua from scratch
using PHP 5.6+ (OOP/MVC, Yii2 architecture) and modern frontend tooling (Gulp, Webpack), successfully supporting
20,000+ active SKUs across catalog navigation, faceted filtering, dynamic cart, and secure checkout workflows.
Database & SQL Query Optimization: Refactored bottlenecked ORM queries into indexed, handwritten SQL, reducing
catalog response latency from multi-second delays to sub-200ms (over 90% query speedup). Designed pre-aggregated
lookup indexes for instantaneous multi-attribute filter results.
SEO Management Tooling: Built an in-house SEO administrative module allowing non-technical marketing specialists to
independently manage canonical tags, Open Graph meta attributes, and schema microdata, removing developer
dependencies for search optimization.

Junior Web / Backend Developer - KTTSOFT 02/2016 - 09/2016 (8 mos) | Dnipro, Ukraine
Developed, customized, and deployed commercial web platforms and client online stores with PHP 5.6+, OpenCart,
WordPress, and Yii2: configured backend logic, customized themes, integrated payment processing gateways, and
implemented on-page SEO best practices.

EDUCATION
Bachelor of Science in Computer Engineering - Dnipro University of Technology 2014 - 2018

LANGUAGES

English: B2 (Upper-Intermediate - fluent technical documentation, RFC authoring, written specs & sprint communication) |
Ukrainian: Native | Russian: Native