Faster delivery
AI-assisted workflows and AI code review cut pull request turnaround to under 24 hours and sped up development cycles about 3x at Payouts.com.
Konstantin BeregovoySenior AI Frontend Engineer, Tech & Team Lead
I build and lead frontend teams for complex products in fintech, platforms and developer tools. React, TypeScript, accessibility and web standards.
- 15+years in frontend
- 8engineers led at peak
- 100xcustomer growth supported at Perimeter 81
- Top 3software development creator in Israel (Favikon, Sep 2026)
How I help a business
Shorter time to market
A unified design system and strict API contracts reduced time to market by 70% across products.
Scale without chaos
A modular UI architecture and an internal analytics platform supported 100x customer growth (30 to 3,000+) at Perimeter 81.
Accessible and audit-ready
WCAG compliance and SOC audit preparation built into the frontend, plus open source work on accessibility validation.
Selected projects
All projectshdr-glow
Free open-source tool that makes selected colors of a logo, image or text glow on HDR screens.
Shahmatland
Chess education platform that grew from a personal MVP to 20+ schools and 13+ instructors.
Jay Framework: a11y-validator
Open-source accessibility rules for Jay Framework (Wix): structural gaps that Lighthouse does not catch.
Plain A11y
Free Chrome extension that turns accessibility audit results into plain-language fixes for designers, writers and product teams.
Interop 2027: Temporal API proposal
Focus area proposal asking browsers to align on the Temporal API in the Interop 2027 cycle.
bereg.dev
This site, built as an engineering exercise: static, accessible and secure by default. Lighthouse 100 and Security Headers A+.
Experience
Full historyFrontend Team Lead (Founding Engineer), Payouts.com
First engineering hire. Built the frontend from scratch and grew the team to 8 engineers. Led AI document parsing with OpenAI and Gemini, a unified Storybook design system that cut time to market by 70%, AI-assisted code review, and frontend preparation for SOC audits.
Senior Frontend Developer (early hire), Perimeter 81, a Check Point company
Built the internal analytics platform that tracked contracts, payments and 100x customer growth, the fleet monitoring dashboards, and the first company-wide design system, which passed technical audits during the Check Point acquisition.
Frontend Developer, NGsoft
Fintech, government and e-commerce projects, including banking and retail clients (Discount Bank, Shufersal). Worked in a secure, isolated environment on accessibility verification and certification for an official government defense website.
Other experience
Frontend Technical Lead (Consultant), OleOle
Advisory role, a few hours a week. Helping an early-stage football fan platform set up frontend practices: test coverage, shared design tokens, browser support standards and hiring.
Founder and Technical Lead (volunteer), Shahmatland
A chess education platform used by 20+ schools and 13+ instructors, available in 5 languages. Built with a volunteer team of teachers and a grandmaster.
Recommendations
On LinkedInHe doesn’t just write exceptional React/TypeScript code; he builds autonomous engineering cultures. By introducing strict API contracts and a unified Design System, he directly contributed to reducing our Time-to-Market by 70%.
He is an outstanding Frontend Lead and a true business partner. He easily connects Product, Design, and Engineering, so everyone works together.
Under his leadership, our frontend architecture became far more modular, testable, and future-proof.
This project was built from scratch, involved a highly complex layout and multiple stakeholder groups, yet Konstantin delivered all milestones on time, with impressive technical precision and clear, proactive communication throughout.
Konstantin has an exceptional ability to see both the big picture and the fine details.
I saw Kosta’s passion and commitment. He is a team player, always willing to do the extra mile and not afraid of hard work.
Writing
All writingBest writing
Brighter than #fff: building an HDR logo tool in the browser
How I built hdr-glow, a free browser tool that makes parts of a logo glow on HDR screens. A gain-map container, a JPEG encoder and a PQ color profile, written from scratch in TypeScript and checked byte for byte.
If <script> is for JS, then what is <ruby> for?
The ruby element is a semantic HTML gem for phonetic annotations, with zero JavaScript and native accessibility.
Forget innerHTML: we are moving to setHTML()
The native Sanitizer API gives secure defaults against DOM-based XSS, fewer dependencies and an easier path to SOC compliance.
Latest writing
Stop the Dancing Numbers with One Line of CSS
Proportional digits make prices and timers jitter. font-variant-numeric: tabular-nums fixes it without a monospace font.
Contact
Open to frontend leadership, consulting and interesting product problems.