Sergey

SERGEY DUDKA
Senior Frontend Developer | React | Next.js | TypeScript
Dnipro, Ukraine | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)
Live Production Platforms: motorsport.com | autosport.com | motorsportnetwork.com | drivenlifestyle.com | deka.ua

PROFESSIONAL SUMMARY

Senior Frontend Developer with 10+ years of commercial experience engineering high-performance web applications and
design systems for enterprise media and e-commerce platforms serving millions of monthly users. Core expertise in React,
Next.js, TypeScript, TanStack Query, and modern frontend architecture. Proven record of cutting LCP by 40% via
automated Critical CSS pipelines, delivering 25+ shared widgets across 6 brands to reduce cross-brand deployment cycles
by 40%, and scaling platforms across 13 regional editions (including full RTL/Arabic). Strong proponent of clean code,
automated testing with Vitest, and streamlined 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 & Tools: Design Systems, Reusable Component Libraries, Micro-frontends, pnpm Monorepo, Webpack 5,
Storybook, PostCSS, D3.js, Chart.js
Testing & Quality: Vitest, React Testing Library, Visual Regression Testing, Automated Unit Testing, Code Reviews
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: Git, GitHub Actions, GitLab CI, CI/CD Pipelines, Docker, Node.js, Express.js, RESTful APIs,
PostgreSQL, MongoDB
Analytics & Platform: Google Tag Manager (GTM) / Data Layer, Piano Paywall, GDPR / Consent Management, SEO &
Structured Data (Schema.org), AMP, Internationalization (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. Led 3 platform
evolutions: jQuery -> Web Components -> React/Next.js using 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 unit and integration test suites using Vitest and React
Testing Library. Established CI/CD workflows via GitHub Actions and GitLab CI for automated linting, test runs, visual
regression checks, and seamless releases across 13 regional editions.
i18n, RTL & Platform Integrations: Delivered 13+ regional editions with full right-to-left (Arabic RTL) layout support.
Integrated GTM analytics with custom data layers, ad vendors (Spring Media, Stroer), Piano paywall subscriptions, and
Alchemer surveys for 50,000+ active respondents while maintaining strict GDPR compliance.
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,
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: 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: Upper-Intermediate (B2 - technical discussions, RFC authoring, documentation) | Ukrainian: Native | Russian:
Native