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Łukasz Kosmaty

PROFILE

Łukasz Kosmaty

Lukasz Kosmaty contributed to the expo/expo repository by delivering robust Android and cross-platform features that modernized developer tooling and improved reliability. He engineered new UI components and theming systems using Kotlin and Jetpack Compose, overhauled the Dev Launcher and Dev Menu, and introduced cross-platform type bridging to reduce runtime errors. Lukasz enhanced build systems with Gradle and CMake optimizations, streamlined module publishing, and implemented stability fixes for native bindings and autolinking. His work included performance benchmarking, dependency upgrades, and documentation improvements, resulting in faster build times, improved onboarding, and a more maintainable codebase. The engineering demonstrated depth and technical versatility.

Overall Statistics

Feature vs Bugs

61%Features

Repository Contributions

224Total
Bugs
58
Commits
224
Features
90
Lines of code
85,458
Activity Months12

Work History

September 2025

30 Commits • 10 Features

Sep 1, 2025

Monthly summary for 2025-09 for the expo/expo repository focusing on business value and technical achievements. Delivered key features and stability fixes across Android, iOS, and tooling that improve build times, maintainability, and contributor experience. Notable outcomes include modernized dependencies, code cleanup, and build-system optimizations, leading to faster iteration cycles and fewer runtime issues in production, while enhancing developer onboarding for new contributors.

August 2025

15 Commits • 4 Features

Aug 1, 2025

August 2025 monthly summary for expo/expo focusing on Android UI modernization, cross-platform data typing, stability fixes, and dependency upgrades. Delivered a visually refreshed, themed Android Expo Dev Menu and Dev Launcher with a new theming system, refreshed screens, improved navigation, and a DevelopmentServers route. Implemented ValueOrUndefined cross-platform typing to distinguish defined vs undefined values across iOS and Android, including converters and tests. Resolved key stability issues including Android image resource loading bug, and platform handling improvements for SymbolView. Upgraded core dependencies (React Native Reanimated to 4.0.2) and advanced platform work with experimental Android converters in expo-modules-core, along with iOS native tests dependencies and privacy/config cleanup. These changes reduce runtime errors, improve developer productivity, and strengthen stability across Android and iOS platforms.

July 2025

34 Commits • 28 Features

Jul 1, 2025

July 2025 performance summary for expo/expo: Delivered major launcher UI enhancements, reliability improvements, and performance optimizations across Android and iOS, strengthening developer experience and accelerating feature delivery. Key investments include new launcher UI components, enhanced account management, a streamlined development session flow, and modernized UI tooling. Also delivered targeted stability and performance fixes across platforms, including autolinking updates and a Reanimated upgrade, with improved error reporting and diagnostics.

June 2025

14 Commits • 2 Features

Jun 1, 2025

Month: 2025-06 | Repository: mrousavy/expo Concise monthly summary focusing on business value and technical achievements: Key features delivered - Android Screen Capture: Documentation update describing required permissions for listening to screenshots in expo-screen-capture on Android 13 (no code changes). Commit: 5baef7d1ca519165cbe9cc7fc47c5d7137196f31. - Dev Launcher and Dev Menu modernization: Android UI overhaul using Jetpack Compose with RN 0.80 compatibility, introducing new UI elements and navigation improvements, including Authentication, Packager service, and Apollo GraphQL integration. Notable commits include a4c6c431e53b6dadece58d88f4c73cb663cc82dc, a062b48a6d0a6749908a7baf56811ec22babb42b, 27bd5abb6e9d10c771e40406c86fce9f734c4e9c, cc7ec6f7073e109a30e9562940ec57925447827d, 62c25ab3ee1e818963129b7d2c6c4da9902006be, c88041458b099ea3e1baf1f5ae7256d6c394d114, 61ba753911f0c9b7a8c8f8d5a3ad7495f343e576, 26456c0f93b8b5ad6cc8e9fcf07f9b3af31f43f6_chunk_1, 52c29a15f22b0e212c33b484c4ee8ca45e2fb848, 4d3dacdf86061319131c0195aa8e2545a98c4c31, 614b1ff137dd8ddc7dc1b6c2db52802fad867c0c. Major bugs fixed - Android stability: Fix null bindings in Android SQLite and AAR autolinking; adjust runAsync/runSync to accept nullable values and ensure local AARs autolinked to resolve linking/build issues. Commits: 5a26092791c794b770519a31ce7987df1deb82a5, 6271d1a7208489943bff9246bcc74307460ab39d. Overall impact and accomplishments - Strengthened Android reliability and developer tooling: - Clear Android 13 permission guidance reduces integration risk for screen-capture-related features. - Stability fixes eliminate build-time regressions related to SQLite bindings and local AARs, improving release confidence. - Jetpack Compose-driven Dev Launcher/Dev Menu modernization delivers a more modern UX, improved navigation, and RN 0.80 compatibility, accelerating adoption for new RN versions. Technologies and skills demonstrated - Jetpack Compose, Kotlin/Android native bindings, and quality-of-life improvements for Android tooling. - Android NDK/SQLite binding management, AAR packaging and autolinking. - RN 0.80 compatibility integration, UI migration, and new UI components (BindingView, Screen headers, defaults). - Apollo GraphQL integration, packager service, account/authentication flow improvements. - General software craftsmanship: improved insets handling, ViewModel binding to Activities, and navigation polish for complex launcher UI.

May 2025

18 Commits • 5 Features

May 1, 2025

May 2025 performance summary for mrousavy/expo: Focused on stabilizing Android integration, advancing core module architecture, and improving developer experience. Delivered stability fixes across Android autolinking, Gradle cache builds, getSharedObjectId, and URI encoding; introduced a trait-based Android core modules system with enhanced type converters and lazy loading; added measurable performance benchmarking for the JSI bridge; modernized key Android apps and packaging, and refreshed docs to Aid onboarding and usage.

April 2025

24 Commits • 15 Features

Apr 1, 2025

April 2025 focused on Android platform reliability, publish workflow improvements, and foundational infrastructure to support stable artifact delivery for downstream apps. Key work spans template upgrades, core task queues, and publication orchestration, with targeted fixes to reduce exposure, improve test signal quality, and tighten Kotlin/Gradle compatibility. Delivered concrete business value by enabling cleaner Android artifact publication, reducing maintenance burden, and increasing platform stability for developers and customers relying on Expo Android artifacts.

March 2025

10 Commits • 3 Features

Mar 1, 2025

March 2025 delivered substantial Android-focused improvements for expo modules, combining feature delivery, stability fixes, and improved publish capabilities that shorten release cycles and enhance developer efficiency. Key outcomes include faster builds, greater configurability, and streamlined maintenance across the Android stack.

February 2025

20 Commits • 2 Features

Feb 1, 2025

Month: 2025-02 Overview: Delivered cross-platform Android/iOS build improvements and enhanced Expo Modules publishing, with a focus on business value, maintainability, and developer productivity. The work covered publishing enhancements, build system modernization, Gradle standardization, stability fixes, and documentation updates to support brownfield onboarding and faster iteration cycles. 1) Key features delivered - Android Modules Publishing and Maven Distribution: Introduced a publish task, publishing metadata, and a mechanism to publish to Maven local when needed. Added canBePublished flag and ensured publishing config applies correctly. Introduced expoPublishToMavenLocal and publication configuration integration (finalizeDsl). These changes enable streamlined, local Maven-based consumption of Android Expo modules, reducing internal distribution friction and enabling reproducible builds. - Documentation and Brownfield Setup Guidance: Updated installation docs for Expo modules, Podfile changes, and autolinking improvements to accelerate onboarding for brownfield projects and reduce integration pain. - Gradle Plugin Standardization and Version Management: Standardized Gradle plugin usage and unified version management across Expo Android projects to simplify maintenance and improve consistency across packages. 2) Major bugs fixed - Android Build System Modernization and Stability: Stabilized and modernized the Android build system. Fixed Groovy indentation, declared copyAssets as a dependency for dev-menu builds, removed unused build types, migrated to Expo Modules Gradle plugin, centralized version management, increased JVM heap, and resolved autolinking-related build issues and pre-building configurations to boost stability. - iOS Build Stability and AppDelegate Centralization: Improved iOS build stability by fixing incorrect Swift header imports, adjusting Xcode flags for use_frameworks, and centralizing AppDelegate integration within the main expo package. - UpdatesConfig Internal Test Accessibility: Increased visibility of the UpdatesConfig config function from private to internal to improve unit test compilation and testability. 3) Overall impact and accomplishments - Improved cross-platform build stability and predictability for Android and iOS projects, reducing CI/build failures and enabling faster developer iteration. - Streamlined module publishing workflow for Android Expo modules, enabling consistent local Maven-based consumption and easier internal distribution. - Simplified maintenance and onboarding with standardized Gradle/version management and up-to-date documentation for brownfield projects. 4) Technologies and skills demonstrated - Gradle scripting and Android Gradle Plugin usage, including publishing workflows and version management. - Maven publishing integration and build pipeline modernization. - Android build stabilization techniques (Groovy fixes, memory tuning, autolinking, pre-building optimization). - iOS build reliability improvements (Swift header management, use_frameworks adjustments, AppDelegate centralization). - Documentation authoring and testability improvements (internal visibility changes).

January 2025

22 Commits • 10 Features

Jan 1, 2025

January 2025 performance summary for mrousavy/expo focusing on delivering cross-platform features, stabilizing core Android components, and modernizing the build and template infrastructure. The month saw targeted feature delivery across autolinking, maps, and module plugins, alongside a suite of Android/iOS maintenance tasks that reduce risk, improve developer experience, and set the stage for faster downstream adoption and feature parity.

December 2024

13 Commits • 1 Features

Dec 1, 2024

December 2024 (mrousavy/expo): Delivered a cohesive Android Gradle Plugin and Autolinking ecosystem for Expo modules, consolidating module tooling, improving build reliability, and enhancing cross-workflow integration. Focused on unifying Gradle plugin architecture for Expo modules, enabling autolinking capabilities for Android, and optimizing build and template processes across Expo modules and bare workflow. Implemented tests and integration points to increase reliability and maintainability, reducing resource usage and streamlining developer workflows.

November 2024

19 Commits • 7 Features

Nov 1, 2024

November 2024 highlights for mrousavy/expo: Focused on Android stability, dependency modernization, and expanded UI capability, delivering features that improve reliability, styling fidelity, and developer experience across the Android core and image/video subsystems, while advancing testing coverage. Key features delivered (business value oriented): - Android and Go module updates: Bumped screens and navigation dependencies and updated related Go modules to keep the platform current with the latest UI components and navigation behaviors, reducing build frictions and enabling smoother releases. - Android UI capabilities: Enabled default support for CSS properties in Android core and introduced an option to disable overflow: hidden, enabling more predictable layout behavior and richer styling controls for apps. - Android image handling enhancements: Added PlaceholderDownsampleStrategy, fixed border-related props and borderColor application, and added tests to validate image-picker dimensions, improving visual consistency and rendering reliability. - Autolinking and tooling: Added applyToRootProject option in Android autolinking, providing broader control for project configurations. - Testing and templates: Introduced tests for image-picker dimensions and resolved compilation issues in modules-template for Android, increasing test coverage and reducing risk of regressions. Major bugs fixed (stability and reliability): - Android Go: Synchronize releadExpoApp and Invalidate experience context, improving session/state reliability in constrained Go environments. - Android stability fixes: Fixed native crash when URI is unresolvable in useImage, fixed proguard-related SharedObject ID retrieval, and ensured GIF animation stops correctly when loop count is 1. - Core and image correctness: Fixed ByteArray event payload handling on Android core, borderColor not applied on Android images, and border-related props for images and videos across Android. - Misc Android compilation: Resolved modules-template Android compilation error and related Android build edge cases. Overall impact and accomplishments: - Strengthened Android stability and rendering fidelity, reducing production incidents and making styling more predictable across devices. - Accelerated delivery of UI and UX improvements by updating dependencies and enabling CSS-based styling by default. - Expanded testing coverage and tooling, lowering regression risk and easing future maintenance. Technologies and skills demonstrated: - Android core and image/video component maintenance, including CSS property support and advanced styling controls - Go module and dependency management for Android/navigation components - Android autolinking enhancements and project configuration control - Test-driven improvements with targeted tests for image-picker and rendering paths - Debugging and crash fixes related to URIs, Proguard, event payloads, and animation loops

October 2024

5 Commits • 3 Features

Oct 1, 2024

Concise monthly summary for 2024-10 focusing on key features delivered, major bugs fixed, overall impact and accomplishments, and technologies demonstrated. Emphasize business value and technical achievements for the mrousavy/expo repository.

Activity

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Quality Metrics

Correctness89.6%
Maintainability89.4%
Architecture88.0%
Performance82.4%
AI Usage22.6%

Skills & Technologies

Programming Languages

C++CMakeGradleGraphQLGroovyJSONJavaJavaScriptKTKotlin

Technical Skills

API IntegrationAPI ReferenceAndroid DevelopmentApollo ClientAuthenticationAuthentication FlowsAutolinkingBabel PresetsBenchmarkingBug FixBug FixingBuild AutomationBuild ConfigurationBuild ProcessBuild System

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

mrousavy/expo

Oct 2024 Jun 2025
9 Months active

Languages Used

GradleJSONJavaKotlinMarkdownYAMLC++JavaScript

Technical Skills

Android DevelopmentDependency ManagementExpo ModulesExpo SDKGradleJava

expo/expo

Jul 2025 Sep 2025
3 Months active

Languages Used

C++GradleJavaJavaScriptKTKotlinMarkdownObjective-C

Technical Skills

API IntegrationAndroid DevelopmentApollo ClientAuthenticationBabel PresetsBuild Configuration

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