Vasyl

VASYL SLEZINSKYI
Frontend Engineer | React, TypeScript, Next.js
[відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація») | Wrocław, Poland | LinkedIn | Telegram | WhatsApp

PROFILE
React Frontend Developer with 3+ years of experience building scalable, production-ready web applications using
React, TypeScript, Redux/RTK, and Next.js. Skilled in implementing real-time features with WebSockets,
developing reusable component architectures with Feature-Sliced Design, and writing maintainable code with
strong unit test coverage. Leverages AI tools to accelerate development and debugging while maintaining code
quality.

SKILLS
Core: React, Next.js, TypeScript, JavaScript, Redux/RTK, Zustand, RTK Query, React Router DOM, React Hook
Form, Webpack, Vite
UI: Tailwind CSS, SCSS, MUI, HTML5, CSS3, Storybook
API & Data: REST APIs, Swagger, WebSockets
Testing & Architecture: Jest, Feature-Sliced Design
Tools & Practices: Git, GitHub, Postman, Sentry, CI/CD, Accessibility, AI-assisted development

EXPERIENCE

Frontend Developer — The TMRW Foundation
10/2023 – Present | Remote
● Developed a frontend developer tool application for an internal usage to manage cutout AI models from scratch
and successfully deployed it to production.
● Designed a scalable and extendable architecture, implementing the Feature-Sliced Design (FSD) methodology,
increasing development speed by 20%.
● Created the Chat component from scratch, including Markdown Editor and files upload feature.
● Introduced unit testing and achieved 36% test coverage across the codebase.
● Created a custom UI kit that enables interface development without styling each element individually, reducing
development time and saving company resources by up to 15%.
● Collaborated with DevOps to set up CI/CD configurations.
● Mentored junior developers on the project and facilitated the onboarding process.
● Conducted code reviews to maintain quality and ensure best practices.

React Developer — COMFY
09/2022 – 10/2023 | Remote
Development and optimization of a high-traffic electronics marketplace and internal retail management systems.
● Built a high-performance storefront with advanced filtering and full-text search, integrated via RTK Query for
real-time pricing and stock synchronization.
● Improved LCP and CLS metrics on PDP and PLP pages via lazy-loading, code splitting, and memoization —
critical for SEO and user retention.
● Implemented React-virtualized for infinite product scroll, maintaining 60 FPS across thousands of catalog items.
● Developed a flexible checkout form constructor with React Hook Form and Zod, handling complex delivery
logic and pickup point selection.
● Integrated Sentry for real-time bug detection in Checkout flow, improving payment transaction success rate.

EDUCATION
Bachelor's Degree in Automation and Computer-Integrated Technologies
Ivano-Frankivsk National Technical University of Oil and Gas | 09/2017 – 06/2021 | Ivano-Frankivsk, Ukraine

LANGUAGES
Ukrainian — Native | English — B2 | Polish — B2