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I'm a frontend developer with over 7 years of experience, specializing in the React ecosystem. I design and implement beautiful, responsive interfaces and enjoy turning complex requirements into clean, maintainable code. I have led cross-functional teams, shipped high-impact web apps, and embraced remote collaboration. I love crafting scalable design systems and performance-focused architectures that boost user engagement.…I'm a frontend developer with over 7 years of experience, specializing in the React ecosystem. I design and implement beautiful, responsive interfaces and enjoy turning complex requirements into clean, maintainable code. I have led cross-functional teams, shipped high-impact web apps, and embraced remote collaboration. I love crafting scalable design systems and performance-focused architectures that boost user engagement.

Gleb Kolosov

Front-End Developer, Web Developer, Programmer, +2

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I'm a frontend developer with over 7 years of experience, specializing in the React ecosystem. I design and implement beautiful, responsive interfaces and enjoy turning complex requirements into clean, maintainable code. I have led cross-functional teams, shipped high-impact web apps, and embraced remote collaboration. I love crafting scalable design systems and performance-focused architectures that boost user engagement.…I'm a frontend developer with over 7 years of experience, specializing in the React ecosystem. I design and implement beautiful, responsive interfaces and enjoy turning complex requirements into clean, maintainable code. I have led cross-functional teams, shipped high-impact web apps, and embraced remote collaboration. I love crafting scalable design systems and performance-focused architectures that boost user engagement.

Available to hire

I’m a frontend developer with over 7 years of experience, specializing in the React ecosystem. I design and implement beautiful, responsive interfaces and enjoy turning complex requirements into clean, maintainable code.

I have led cross-functional teams, shipped high-impact web apps, and embraced remote collaboration. I love crafting scalable design systems and performance-focused architectures that boost user engagement.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

Bulgarian

Fluent

Russian

Fluent

Work Experience

Lead Frontend Developer at Finanztip

July 1, 2022 - Present

Spearheaded the development of a Next.js + TypeScript application from the ground up, achieving 50,000 active users within 2 months and contributing to $150,000 in monthly revenue. Implemented dynamic content rendering across React and React Native via a headless CMS, reducing load times by 24% and supporting up to 1,000 daily users with $5,500 revenue per page. Built a scalable design library of 100+ components in Storybook adopted by 4 teams. Optimized architecture with Next.js to cut initial load from 1.2s to 480ms, boosting retention by 12%. Implemented a user-tracking system using Google Analytics for 100,000+ monthly users, increasing conversions by 18% via UX improvements. Established a TypeScript + Sentry error-handling framework delivering a 99.96% crash-free rate and faster bug resolution.

Senior Frontend Developer at Futurist-Labs

February 1, 2021 - July 1, 2022

Led development of a full-scale auction platform using Next.js from scratch in under 6 months, resulting in $1,500,000 in turnover in the first 4 months after MVP. Built a real-time system with a custom Socket.IO-based WebSocket framework, scaling to 11,000 concurrent users per auction. Engineered a dynamic mapping interface with Google Maps API rendering 100 parcels per page, driving high engagement with 300+ bids and $10,000 wager per parcel on average.

Senior Frontend Developer at Regate

January 1, 2019 - December 1, 2021

Led a team of 6 developers across 10 cross-functional teams to deliver a high-capacity accounting solution for 20k+ business customers, supporting up to 200,000 daily users. Facilitated cross-team discussions introducing a task-review process, reducing technical debt by 5.5% and accelerating milestone delivery by 9%. Optimized CI workflows and Playwright-based E2E tests, saving over $80,000 yearly.

Frontend Developer at Temedica

March 1, 2017 - January 1, 2019

Developed a data visualization tool for React applications handling up to 2,000 data points, achieving a 243% performance improvement over prior Victory Native-based solution. Documented 50+ critical materials for React and React Native to satisfy strict certification requirements and facilitate the process. Implemented unit tests with Jest to improve code quality and reduce bugs by 8%.