Mateusz Burzyński
Javascript Developer at Replay.io
Wrocław, Lower Silesian Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolMateusz Burzyński is a seasoned JavaScript developer with 11 years of experience building and refining front-end and full-stack tooling, currently contributing to Replay.io after senior work at Stately and LiveChat. He combines deep TypeScript and React expertise with a strong track record in bundlers and build tooling—contributions span Rollup, Babel, and Rollup plugins as well as core work on the TypeScript compiler. Mateusz is an active open-source contributor whose fixes improve performance, correctness, and test coverage across high-profile projects like React, Redux, styled-components, Storybook and Playwright. He has a knack for subtle but impactful engineering: restoring named exports, tightening type definitions, and optimizing animation and event-handling code to avoid unnecessary copies and warnings. Comfortable across the stack, he also performs QA and automation work—adding edge-case tests for Playwright and Cypress—and improves monorepo build flows and CI/CD automation. Based in Wrocław, Poland, he pairs academic computer science training with practical experience modernizing large JavaScript ecosystems.
11 years of coding experience
9 years of employment as a software developer
Inżynier (Inż.), Informatyka, Inżynier (Inż.), Informatyka at Politechnika WrocławskaInformatyka, Informatyka at XIV LO im. Polonii Belgijskiej we Wrocławiu
Polish, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (150)
e2e-testing10
package-management10
storybook10
ui-components10
compiler-development10
testing10
css-in-js10
autocomplete10
test-framework10
ramdajs10
typescript-definitions10
styled-components10
webpages10
type-definition10
web-content10
Programming languages (17)
Github contributions (5)
redux-saga/redux-saga
Aug 2016 - Aug 2022
An alternative side effect model for Redux apps
Role in this project:
Back-end Developer
Back-end DeveloperContributions:20 releases, 81 reviews, 440 commits in 6 years 1 month
Contributions summary:Mateusz contributed to the Redux Saga project by implementing the `flush` effect. The `flush` effect allows for clearing channel buffers and retrieving buffered items as a batch in sagas. Additionally, the user added API documentation for the new `flush` effect and also implemented a throttle helper. Furthermore, the user made improvements to the helpers.
reduxsagasmiddlewareredux-saga
changesets/changesets
Oct 2019 - Dec 2022
🦋 A tool to manage versioning and changelogs with a focus on monorepos
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:3 releases, 600 reviews, 107 commits in 3 years 2 months
Contributions summary:Mateusz primarily contributed to improving the `changesets/changesets` project by implementing features related to package versioning and changelog management. This included enhancements to handle multi-line changesets, adding support for pnpm workspaces and custom registries, and providing CI/CD support through GitHub Actions. Additionally, the user was responsible for refactoring the code base by implementing the `exports` field in the package.json file and fixing existing bugs.
versioning
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