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mhawryluk

PROFILE

Mhawryluk

Marcin Hawryluk developed and enhanced core features for Expensify-App and TypeGPU, focusing on time tracking, workspace management, and mobile-friendly UI improvements. He implemented robust time expense workflows, consolidated navigation and modal systems, and improved internationalization and localization, using JavaScript, TypeScript, and React Native. Marcin’s work included backend integration for policy rate handling, AI-assisted code review automation, and comprehensive test-driven development to ensure reliability. In TypeGPU, he updated documentation and optimized live example layouts for mobile usability. His contributions demonstrated depth in both front-end and back-end engineering, resulting in more maintainable codebases and improved user experience across platforms.

Overall Statistics

Feature vs Bugs

53%Features

Repository Contributions

158Total
Bugs
44
Commits
158
Features
49
Lines of code
6,868
Activity Months5

Work History

February 2026

31 Commits • 8 Features

Feb 1, 2026

February 2026 (2026-02) — Delivered core Time Tracking capabilities, AI-assisted reviews, and onboarding enhancements for Expensify-App, while strengthening reliability and localization. Business value was realized through faster, more accurate time-entry, AI-augmented review workflows reducing cycle times, improved expense governance with workspace-aware restrictions, and enhanced localization and charting capabilities for better decision-making.

January 2026

92 Commits • 27 Features

Jan 1, 2026

Concise monthly summary for January 2026 highlighting key features delivered, major bugs fixed, overall impact, and technologies demonstrated across two Expensify repositories. The month focused on reviving and maturing Time Tracking capabilities, improving time expenses workflow, and enhancing code quality and localization, with strong back-end and front-end alignment to business objectives.

October 2025

25 Commits • 9 Features

Oct 1, 2025

Summary for 2025-10: Delivered key UX and performance enhancements in Expensify-App with a focus on Workspaces domain visibility, domain-related UI polish, internationalization, and code quality. The month balanced feature delivery with stability work to support admins and members, improved performance, and expanded audience reach through translations. Business value was realized through clearer domain management in Workspaces, faster and more reliable UI, and a maintainable codebase.

September 2025

7 Commits • 3 Features

Sep 1, 2025

September 2025 monthly summary: Navigation robustness for verify-account flows, modal/animation consolidation, and developer tooling improvements across Expensify apps, delivering measurable UX reliability and engineering efficiency.

January 2025

3 Commits • 2 Features

Jan 1, 2025

January 2025 monthly summary for software-mansion/TypeGPU: Delivered updates to StackBlitz demo docs with the latest library release and implemented mobile-friendly UI improvements for live examples, enhancing clarity and accessibility.

Activity

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Quality Metrics

Correctness92.4%
Maintainability90.0%
Architecture88.8%
Performance89.8%
AI Usage25.2%

Skills & Technologies

Programming Languages

CSSHTMLJSONJavaScriptNoneTypeScript

Technical Skills

API developmentAPI integrationBabel configurationCSSCode CleanupCode LintingCode MaintenanceCode RefactoringComponent DesignComponent RefactoringConfiguration ManagementDependency ManagementDocumentationFront End DevelopmentFront-end Development

Repositories Contributed To

4 repos

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

callstack-internal/Expensify-App

Sep 2025 Feb 2026
4 Months active

Languages Used

JavaScriptTypeScriptJSON

Technical Skills

Code LintingConfiguration ManagementFront-end DevelopmentFrontend DevelopmentNavigationReact Native

Expensify/App

Sep 2025 Jan 2026
2 Months active

Languages Used

TypeScriptJavaScriptNone

Technical Skills

Front-end DevelopmentNoneReactTypeScriptbackend developmentfront end development

software-mansion/TypeGPU

Jan 2025 Jan 2025
1 Month active

Languages Used

CSSHTMLJavaScriptTypeScript

Technical Skills

CSSDependency ManagementDocumentationFrontend DevelopmentHTMLJavaScript

software-mansion-labs/expensify-app-fork

Sep 2025 Sep 2025
1 Month active

Languages Used

JavaScriptTypeScript

Technical Skills

Dependency ManagementFront-end DevelopmentJavaScriptMobile DevelopmentReactReact Native

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