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Hi, I'm a Senior Front-End Engineer with deep expertise in React and Next.js, based in Warsaw, Poland. I specialize in building scalable user interfaces with TypeScript and modern front-end stacks. I value clean, modular code, maintainability, and performance. I enjoy collaborating with product owners and designers, mentoring teammates, and driving continuous improvement. I’ve led migrations to modern stacks, steered frontend initiatives across client teams, and delivered robust features with high test coverage.…Hi, I'm a Senior Front-End Engineer with deep expertise in React and Next.js, based in Warsaw, Poland. I specialize in building scalable user interfaces with TypeScript and modern front-end stacks. I value clean, modular code, maintainability, and performance. I enjoy collaborating with product owners and designers, mentoring teammates, and driving continuous improvement. I’ve led migrations to modern stacks, steered frontend initiatives across client teams, and delivered robust features with high test coverage.

Stsiapan Zayalenchyts

Front-End Developer, Web Developer, Full Stack Developer, +2

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Hi, I'm a Senior Front-End Engineer with deep expertise in React and Next.js, based in Warsaw, Poland. I specialize in building scalable user interfaces with TypeScript and modern front-end stacks. I value clean, modular code, maintainability, and performance. I enjoy collaborating with product owners and designers, mentoring teammates, and driving continuous improvement. I’ve led migrations to modern stacks, steered frontend initiatives across client teams, and delivered robust features with high test coverage.…Hi, I'm a Senior Front-End Engineer with deep expertise in React and Next.js, based in Warsaw, Poland. I specialize in building scalable user interfaces with TypeScript and modern front-end stacks. I value clean, modular code, maintainability, and performance. I enjoy collaborating with product owners and designers, mentoring teammates, and driving continuous improvement. I’ve led migrations to modern stacks, steered frontend initiatives across client teams, and delivered robust features with high test coverage.

Available to hire

Hi, I’m a Senior Front-End Engineer with deep expertise in React and Next.js, based in Warsaw, Poland. I specialize in building scalable user interfaces with TypeScript and modern front-end stacks.

I value clean, modular code, maintainability, and performance. I enjoy collaborating with product owners and designers, mentoring teammates, and driving continuous improvement. I’ve led migrations to modern stacks, steered frontend initiatives across client teams, and delivered robust features with high test coverage.

Skills

Experience Level

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Polish

Intermediate

English

Advanced

Work Experience

Senior User Interface Engineer - Front-End at TPConnects Technologies

September 1, 2024 - Present

Migrating an Angular (v16) + Express.js app to a modern Next.js + NestJS stack; designed and led development of critical features to enable moving users to a new version; collaborated with designers and product owners to balance development speed and functionality; mentored two junior developers; conducted POC research on new features and architecture.

Senior Software Engineer - Front-End at Godel Technologies Europe

May 1, 2022 - December 31, 2022

Led frontend development of an SPA as part of a UK client team; maintained unit test coverage near 100% using Jest and React Testing Library; implemented end-to-end tests with Cypress; contributed to code quality and performance improvements.

Frontend Engineer - Front-End at EPAM Systems

December 1, 2020 - February 28, 2022

Remote frontend development on a booking platform; coordinated codebase migration to TypeScript; migrated app state management to Redux Toolkit; improved app performance and enabled rapid delivery of new functionality.

On-site Junior Software Engineer - Front-End at Large Telecom Client (On-site)

July 1, 2019 - November 30, 2020

Contributed to a telecommunications IoT project; used proprietary languages and technologies; implemented frontend features and assisted in full-stack tasks as part of a larger team.