Vadym

Vadym Dera
Senior UI Engineer | Markup Engineer | UI Architect | Angular Frontend
Krakow, Poland | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація»)
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PROFESSIONAL SUMMARY
UI Engineer / UI Lead with 10+ years of experience building scalable, high-performance web applications
and leading UI development across multi-team environments. Currently leading UI engineering at SPRIBE,
with ownership of UI architecture, design systems, storybook component libraries, UI standards, and
cross-team implementation across large-scale iGaming products.
● Hands-on experience in scalable frontend architecture, technical leadership, code review, web
performance optimization, Core Web Vitals, and cross-browser compatibility.
● Experienced with high-load platforms and complex internal products, with a strong focus on
reusable UI, consistent implementation, and maintainable frontend systems.

TECHNICAL SKILLS
● HTML & CSS: HTML5, Semantic HTML, CSS3, SCSS/SASS, LESS, BEM, CSS Grid, Responsive & Adaptive
Web Design, Flexbox
● AI: AI, Claude Code, Codex
● Design Systems & Component Libraries: Design Systems, UI/UX Accessibility & Standards, Design
Tokens, Component-based Styling, Storybook
● JavaScript & Frontend Frameworks: JS, Angular, React, jQuery, AJAX
● Accessibility: WCAG 2.1 / 2.2, WAI-ARIA, Semantic Accessibility, Keyboard Navigation
● Web Performance: Core Web Vitals, Page Speed Optimization, Image & Font Optimization, Rendering
Performance
● Build & Tooling: Webpack, Vite, npm, ESLint, Stylelint, Prettier, Sentry, Playwright, Unit Testing
● CMS & Integration: Umbraco, EPiServer, TYPO3, ASP.NET MVC Integration
● Tools & Collaboration: GitLab, BitBucket, SVN, Mercurial, Figma, Jira

WORK EXPERIENCE
SPRIBE — UI Developer / UI Lead / Front-End Developer
2022–present | Ukraine – Poland
Project: iGaming Platform
Technologies: HTML5, CSS3, SCSS, Responsive Web Design, Angular Material, Semantic HTML, Design
Systems, Pixel-perfect, Cross-browser Compatibility, Core Web Vitals, Angular, BEM, Git, Webpack,
Playwright, Sentry, AI, Claude Code.
Key impact: Improved platform loading performance for users on slow connections, introduced a flexible
multi-skin design system, and established shared UI engineering standards that reduced duplication and
accelerated development across multiple teams and products.
● Led UI engineering across multiple iGaming products, managing the UI team and driving
implementation across 5 teams and internal tools.

● Owned UI architecture and introduced a scalable design system with reusable components, flexible
theming, skinning, and unified UI standards, improving consistency and accelerating feature delivery
across teams.
● Led Core Web Vitals, page-load performance, cross-browser compatibility, and legacy-device
optimization, with a focus on slow networks and lower-end devices.
● Used AI tools, including Claude Code, in day-to-day development for implementation, refactoring,
testing, and code analysis.
● Contributed to project hiring, including technical interviews, candidate evaluation, and onboarding
support for UI and markup engineering roles.

Ukad — Middle Front-End Developer
2015–2022 | Ukraine
● Developed and implemented new UI interfaces, including redesigns and reskinning of existing
products.
● Delivered pixel-perfect, responsive layouts based on design specifications across multiple
CMS-based projects.
● Improved front-end performance and Core Web Vitals, while maintaining cross-browser
compatibility and consistent UI quality.
● Built reusable UI components and integrated frontend implementations with Umbraco, TYPO3,
EPiServer, and ASP.NET MVC-based platforms.
Projects:
● Ginza.se – Sweden's largest online digital content store. Based on CMS Umbraco. Integrated and
maintained new UI designs and product features across large content-driven platforms. Worked on
implementing new interfaces, updating and reskinning existing pages, improving reusable UI
components, and supporting ongoing frontend development. Focused on performance optimization,
page-load speed, cross-browser compatibility, responsive behavior, and maintaining stable UI
across different sections of the products.
● Alt.dk – Denmark's largest media portal. Based on CMS Episerver. Worked on a major UI facelift and
migration to a new CMS Episerver, implementing updated designs and adapting existing interfaces
to the new platform. Strong focus on mobile-first and responsive development, ensuring consistent
usability across devices and screen sizes. Also worked on PageSpeed and frontend performance
optimization, improving page-load times and overall user experience.

W3 Ukraine — Front-End Developer
2013–2015 | Ukraine
● Developed responsive landing pages for various brands, focusing on accurate design
implementation, cross-browser compatibility, and clean, maintainable markup.

Languages
● English – professional working proficiency
● Ukrainian – native
● Russian – native