Grzegorz Szeliga
Frontend Developer at OrbitalBet
Chrzanów, Lesser Poland Voivodeship
Summary
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RockstarGrzegorz Szeliga is a Frontend Developer with 11 years of experience building high-traffic web applications and leading frontend teams from Poland. He has driven architecture improvements and major migrations—moving projects from JavaScript to TypeScript and from Redux to MobX—while shaping developer workflows as a technical lead at Playbook Engineering. His background spans betting platforms, large news portals, social networking, and full-stack agency work, giving him a pragmatic blend of performance-focused engineering and product-facing delivery. Comfortable with modern tooling (React, Node.js, TypeScript, Jest, Playwright) and lower-level integrations (WebSocket, tRPC, Rust), he pairs hands-on coding with mentoring and recruitment. Notably, he systematically improved a live betting app’s architecture and developer productivity, demonstrating a knack for making complex systems easier to maintain and scale.
11 years of coding experience
6 years of employment as a software developer
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (200)
realtime10
servo10
testing10
graph-database10
hyper10
nosql-database10
serverless10
foundationdb10
deno10
javascript10
client-library10
build-configuration10
non-blocking10
nosql10
io-uring10
Programming languages (11)
Github contributions (5)
szagi3891/AMDLoader
Mar 2015 - Jan 2017
Contributions:14 commits, 6 PRs, 54 pushes in 1 year 10 months
dlarequirejsjavascript
szagi3891/reactive_utils
May 2024 - Mar 2025
Contributions:172 pushes, 1 branch in 10 months
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