Michał Pierzchała
Head Of Technology at Callstack
Krakow, Lesser Poland Voivodeship
Summary
🤩
Rockstar🎓
Top SchoolMichał Pierzchała is Head of Technology with 11 years of hands-on experience in mobile and front-end engineering, based in Krakow. He brings deep expertise in React Native and testing—working with Callstack, Jest, and the React Native Community—combining leadership with prolific open-source contributions to projects like react-native, jest, haul, and prettier. His work spans CLI tooling, autolinking and build improvements for iOS/Android, and robust test automation, reflecting a rare mix of platform-level changes and developer experience improvements. Michał’s background in modern computer graphics (MSc) and early contributions to Flow and TypeScript tooling reveal a strong emphasis on tooling, typing, and performance. Colleagues rely on him not just for architecture and delivery but for making complex native-Web integrations smoother and more testable.
11 years of coding experience
AGH University
English
Stackoverflow
1,800reputation
129kreached
18answers
1question
unit-testing
top-5%
jasmine
top-5%
jestjs
top-5%
Github Skills (56)
server-side10
angular10
ss10
javascript10
ios10
type-check10
mobile-development10
website-development10
react-native10
testing10
css10
app-framework10
server-side-rendering10
flow-typed10
git-repository10
Programming languages (17)
Github contributions (5)
callstack/react-native-testing-library
Oct 2018 - Jan 2023
🦉 Simple and complete React Native testing utilities that encourage good testing practices.
Role in this project:
Front-end Developer & QA Engineer / Test Automation Engineer
Front-end Developer & QA Engineer / Test Automation EngineerContributions:51 releases, 251 reviews, 347 commits in 4 years 3 months
Contributions summary:Michał's contributions primarily revolve around enhancing and testing the `react-native-testing-library` repository. They implemented new features, such as adding the `getByType` helper, and refined existing ones, like making `getAllBy*` methods throwable. Additionally, the user added tests to validate the functionalities and ensure the reliability of the library's features. The changes demonstrate a focus on improving the testing capabilities and user experience of the library.
reactreact-native-testingjestreact-nativetesting
react-native-community/cli
Oct 2018 - Jan 2023
The React Native Community CLI - command line tools to help you build RN apps
Role in this project:Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:161 releases, 614 reviews, 432 commits in 4 years 3 months
Contributions summary:Michał primarily focused on improving the React Native CLI tool. Their contributions included migrating the codebase to use modern JavaScript features and Babel transformations, refactoring and improving the linking process for native modules and assets, and adding support for features such as autolinking and improved upgrade functionality. They also made improvements to the iOS build process.
reactyarnreact-nativejavascriptcommand-line-tools
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