Radek Pietruszewski
Poland
Summary
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RockstarRadek Pietruszewski is a seasoned software engineer with 16 years of experience focused on mobile (iOS/Android) and cross-platform development, based in Poland. He is an active open-source contributor whose performance-focused work on React Native (notably JSC string conversion optimizations and iOS 13 API updates) has improved the framework's runtime and platform integration. Radek combines mobile UI/component refinement (react-native-linear-gradient) with low-level and tooling expertise—contributing to fastlane, LokiJS, and Swift core libraries—demonstrating fluency across Swift, JavaScript, and backend systems. He also brings strong test automation and code-quality discipline, having added extensive Foundation tests and CI-friendly refactors. Pragmatic and detail-oriented, Radek is comfortable shipping both developer tooling and production app features while reducing friction in build and runtime workflows.
16 years of coding experience
Github Skills (72)
mobile-development10
lexer10
testing10
command-line-interface10
javascriptcore10
indexeddb10
database-management10
ios-simulator10
javascript10
rxswift10
nsuserdefaults10
app-framework10
xctest10
uid10
front-end-development10
Programming languages (17)
Github contributions (5)
radex/SwiftyTimer
May 2015 - Jan 2017
Swifty API for NSTimer
Role in this project:
iOS Mobile Developer
iOS Mobile DeveloperContributions:93 commits, 16 PRs, 48 pushes in 1 year 8 months
Contributions summary:Radek primarily contributed to the development of the SwiftyTimer library, focusing on adding new features and functionality related to timer management within iOS applications. Their work involved implementing new timer creation methods (`new`, `after`, `every`), as well as integrating time-related extensions for `Int` and `Double`. The user's commits also included the addition of unit tests to ensure the reliability and correctness of the timer implementations. Subsequent commits improved the timer functionality and updated the code for Swift 2 and later Swift versions.
nstimeriostimerswiftyswift
react-native-linear-gradient/react-native-linear-gradient
Sep 2018 - Sep 2019
A <LinearGradient /> component for react-native
Role in this project:Mobile Developer (Android/iOS)
Mobile Developer (Android/iOS)Contributions:50 commits, 30 PRs, 32 pushes in 1 year
Contributions summary:Radek primarily focused on refactoring and cleaning up the codebase of a React Native component for linear gradients. Their contributions involved removing prop types, cleaning up flow type annotations, and updating the component's structure for iOS, Android, and Windows platforms. They also introduced new features like angle control for the gradient, enhancing the component's flexibility.
linear-gradientreact-native
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