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@slavcouser

Senior Frontend Engineer at OpenTalk who led architecture for a video-conferencing SaaS serving German government agencies.

North Macedonia

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At OpenTalk, I led frontend architecture for a video-conferencing SaaS serving German government agencies with digital sovereignty requirements. I optimized the WebRTC media pipeline and led its migration to LiveKit while preserving end-to-end encryption.

I also optimized React rendering to eliminate frame drops during calls with 25+ participants, built a custom authentication library, and wrote Playwright tests for real-time call flows.

Across other products, I architected a Lerna monorepo, built real-time chat infrastructure, and developed web and mobile applications. In my projects, I use MCP and multi-agent workflows to develop React and TypeScript applications.

Experience

Work history, roles, and key accomplishments

Senior Frontend Engineer

OpenTalk

Jan 2022 - Apr 2026 (4 years 3 months)

Led frontend architecture for a video-conferencing SaaS from MVP to production, serving German government agencies. Owned the real-time media pipeline, migrated to LiveKit SDK, and optimized React performance for real-time video UI.

React TypeScript WebRTC LiveKit SDK Playwright Performance Optimization Authentication End To End Testing

Frontend Team Lead

School Managing Platform

Jan 2020 - Dec 2021 (1 year 11 months)

Architected a Lerna-based monorepo for teachers, parents, and live classes. Optimized developer onboarding and coached the team on code scalability through modular architecture.

React TypeScript GraphQL CodeGen Lerna ESLint Monorepo Team Leadership

Team Lead

Networking & Geosocial App

Jan 2018 - Dec 2019 (1 year 11 months)

Led a team of three developers building a high-traffic dating and networking application. Built real-time chat infrastructure, matching algorithms, and geolocation services.

React Vue.Js Redux Nuxt.Js ExpressJS Real time Chat Geolocation Team Leadership

Mobile Developer

British Freelance Community Platform

Jan 2017 - Dec 2017 (11 months)

Developed a hybrid mobile app from scratch managing bank accounts, invoices, and fund transfers for a large UK freelance network.

React Native TypeScript Mobile Development

Full Stack Developer

Global Marketing Platform

Jan 2016 - Dec 2016 (11 months)

Led the full-stack development of a web and mobile marketing application for a world-renowned sparkling juice brand. Architected the service for high-traffic promotions with OCR, rewards engine, and geolocation.

PostgreSQL S3 Fullstack Development OCR Geolocation