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Serhii Bielik

@serhiibielik

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Frontend Developer at xTiles who built a background-safe Pomodoro timer and product features used by 800,000+ people.

Ukraine

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At xTiles, I build frontend features for a collaborative SaaS workspace used by 800,000+ people. I built a Pomodoro timer using a Service Worker and IndexedDB, with deadline-based timing designed to stay accurate when a tab runs in the background.

I’ve also built a modular onboarding system and the Form view of collections, and worked on navigation, paste and drag-and-drop, and real-time updates. I work with product, design, and backend from specification to production, and use AI tools daily in a review-driven workflow.

Experience

Work history, roles, and key accomplishments

Current

Frontend Developer

Current

xTiles

Jul 2021 - Present (5 years 3 months)

Built the Pomodoro timer on a Service Worker with IndexedDB and deadline-based timing. Designed and built a modular onboarding system, a form builder, and a unified navigation pipeline.

TypeScript React Next.js MobX Service Workers IndexedDB WebSockets Lexical DnD Kit REST APIs Jest Testing Library React Hook Form Tailwind

Head of VIP Clients Department

TM Vitan

Mar 2011 - Jun 2021 (10 years 3 months)

Progressed from sales manager to department head over 10 years. Managed key accounts including EpicentrK, Nova Linia, and Flagman, handling the full cycle from production to delivery and payment.