Siarhei Prakofyeu
@siarheiprakofyeu
I build scalable React and TypeScript interfaces for AI products, SaaS platforms, and complex operational systems.
PolandWhat I'm looking for
At Toloka, I build self-service data-labeling products, including production AI agent chat interfaces, sub-agent architecture, and AI-powered onboarding editors that improved task completion quality by 10–15%.
I also built core capabilities for Toloka’s low-code Task Template Builder, developing 10+ specialized annotation components and cutting monorepo build times by 60% through Vite and pnpm workspace optimization.
Previously at Brimit, I owned frontend architecture for manufacturing ERPs, helped a three-developer team raise code-quality standards, and delivered automation that reduced warehouse packaging operations from about 60 minutes to 2–3 minutes. I’ve also built real-time Ethereum analytics visualizations at Finwin Technologies.
Experience
Work history, roles, and key accomplishments
Built the Self-Service Platform, an SPA for configuring data labeling projects, and developed a production AI agent chat interface with sub-agent architecture. Led monorepo optimization for the Task Template Builder, reducing build times by 60%.
Senior Frontend Developer
Brimit
Aug 2020 - Jul 2025 (4 years 11 months)
Owned frontend architecture for custom ERP systems for a global optical equipment manufacturer, and developed a customer portal for a Belgian tax and accounting firm. Drove engineering excellence and productivity initiatives, reducing build times and improving performance.
Frontend Developer
Finwin Technologies
Aug 2018 - Aug 2020 (2 years)
Developed a real-time blockchain analytics platform for Ethereum smart contract monitoring, implementing complex D3.js visualizations and virtualization for smooth rendering of thousands of data points.
Education
Degrees, certifications, and relevant coursework
Belarusian State University of Informatics and Radioelectronics
Bachelor's degree, Computer Science
2014 - 2018
Bachelor's degree in Computer Science from Belarusian State University of Informatics and Radioelectronics, completed in 2018.
Tech stack
Software and tools used professionally
Availability
Location
PolandAuthorized to work in
Salary expectations
Social media
Job categories
Skills
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