Sergei Butko
Staff React Native Engineer
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolSergei Butko is a Staff React Native engineer based in Berlin with 12 years of hands-on experience building high-performance iOS and Android apps. He has led end-to-end mobile development at companies like Zattoo, Lowkey and DexTechnology, shipping and maintaining dozens of apps while driving performance improvements (stable 60 FPS and 60-80% faster responses) and introducing best TypeScript/React-Native practices. Sergei combines strong TypeScript expertise with native module development, developer tooling and automation, and has a track record of mentoring teams, running tech interviews, and creating internal templates and courses. He is an active GitHub maintainer who keeps personal projects current and contributes to open-source React Native work. Notably, he blends product-first delivery with platform-level optimizations—improving both developer productivity and runtime performance.
13 years of coding experience
8 years of employment as a software developer
Bachelor's degree Computer Software Engineering, Bachelor's degree Computer Software Engineering at Tver State Technical University
English, Russian, Ukrainian, German
Stackoverflow
2,620reputation
91kreached
44answers
3questions
github
top-5%
Github Skills (130)
e2e-testing10
testing10
automation10
web-testing10
javascript10
chromium10
webkit10
youtube10
credit-card10
firefox10
input-mask10
test-automation10
electron10
anki10
input-text10
Programming languages (14)
Github contributions (5)
dobladov/astro-blog
Aug 2023 - May 2026
Contributions:124 pushes in 2 years 9 months
hbz/oerworldmap-keycloak-theme
Jan 2019 - Dec 2019
Theme for Keycloak
Contributions:43 commits, 3 PRs, 23 pushes in 10 months
keycloak
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