Sebastian Siejek
Summary
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SeniorSebastian Siejek is a Frontend Developer with eight years of experience building scalable React and Next.js applications and custom WordPress solutions from Poznan, Poland. He architects robust frontends in TypeScript, migrating legacy AngularJS/PHP stacks to modern component-driven systems while documenting reusable UI with Storybook. Comfortable across the stack, he pairs React frontends with Node.js, Firestore or MySQL backends and has shipped self-built apps like Planning Poker and Daily Standup end-to-end. At TimeCamp he focuses on frontend architecture, web components and testing (Jest, Cypress, Playwright) to ensure maintainability and performance. Formerly a team lead building Docker-based custom WordPress themes and CLI tooling, he brings both hands-on coding and delivery leadership. Open to remote and international roles, he’s deliberately expanding backend expertise to grow into a full-stack engineering role.
8 years of coding experience
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (4)
remote-server8
wordpress-plugin6
backend5
python3
Programming languages (6)
Github contributions (5)
sebastiansiejek/meet.us-backend
Mar 2021 - Mar 2022
Contributions:25 reviews, 232 commits, 86 PRs in 11 months
sebastiansiejek/sebastiansiejek.dev
Jan 2022 - May 2025
Contributions:15 PRs, 37 pushes, 13 branches in 3 years 4 months
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