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Michał Muzyk

PROFILE

Michał Muzyk

Michał Muzykowski contributed to Expensify/App and related repositories by developing and refining reimbursement workflows, onboarding navigation, and privacy-preserving data exports. He implemented features such as length-preserving data masking, currency-aware payment flows, and policy-driven onboarding logic using TypeScript, React, and JavaScript. His work included backend integration for secure exports, frontend improvements for multi-step navigation, and robust error handling to enhance reliability. Michał also focused on code quality, applying refactoring and formatting standards to improve maintainability. Through these efforts, he addressed business needs for compliance, user experience, and data privacy, demonstrating depth in both technical execution and problem-solving.

Overall Statistics

Feature vs Bugs

72%Features

Repository Contributions

70Total
Bugs
7
Commits
70
Features
18
Lines of code
4,254
Activity Months5

Work History

February 2026

4 Commits • 2 Features

Feb 1, 2026

February 2026 monthly summary for callstack-internal/Expensify-App focused on delivering robust VBBA navigation and reliable bulk payment processing. Major work included refactoring the VBBA flow to useSubPage and overhauling bulk payments to align with per-policy state and admin policies, improving correctness, flexibility, and business value.

January 2026

28 Commits • 6 Features

Jan 1, 2026

January 2026 monthly work summary focusing on key accomplishments and business impact across Expensify/App and internal Expensify App. Delivered major reimbursement and onboarding workflow improvements, enhanced navigation and multi-step flows, currency-aligned KYC handling, and code quality gains. These changes improve user experience, reduce duplicate submissions, and strengthen policy compliance, while increasing test coverage and maintainability.

October 2025

16 Commits • 4 Features

Oct 1, 2025

During Oct 2025, delivered targeted UX and policy improvements across margelo/expensify-app-fork, focusing on reducing friction in USD reimbursement flows, clarifying VBBA state handling, standardizing director terminology, and enhancing policy/category/workspace logic for MoneyRequest and IOU flows. A dedicated code quality cleanup aligned the codebase with Prettier standards. These changes improve business value by speeding reimbursements, reducing edge-case risks, and improving compliance and maintainability.

September 2025

21 Commits • 5 Features

Sep 1, 2025

September 2025 monthly summary focusing on privacy-preserving data exports, multi-currency reimbursement onboarding, currency-aware flows, and reliability improvements across Expensify/App and the forked repo. Delivered features and fixes that enhance data privacy, export determinism, onboarding for AUD/GBP/EUR, currency-aware payment and wallet flows, and Onyx stability with robust error handling and maintainability enhancements.

October 2024

1 Commits • 1 Features

Oct 1, 2024

Concise monthly summary for 2024-10 focused on Expensify/expensify-common contributions.

Activity

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Quality Metrics

Correctness88.2%
Maintainability86.2%
Architecture82.6%
Performance84.2%
AI Usage23.8%

Skills & Technologies

Programming Languages

JavaScriptMarkdownTypeScript

Technical Skills

API IntegrationAPI integrationBackend DevelopmentCode RefactoringConstants ManagementData MaskingData StructuringDatabase InteractionDebuggingDocumentationError HandlingForm HandlingFront End DevelopmentFront-end DevelopmentFrontend Development

Repositories Contributed To

4 repos

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

margelo/expensify-app-fork

Sep 2025 Oct 2025
2 Months active

Languages Used

JavaScriptTypeScript

Technical Skills

API IntegrationBackend DevelopmentDatabase InteractionDebuggingError HandlingForm Handling

Expensify/App

Sep 2025 Jan 2026
2 Months active

Languages Used

TypeScriptJavaScriptMarkdown

Technical Skills

Data MaskingJavaScriptRefactoringSecurityTypeScriptAPI integration

callstack-internal/Expensify-App

Jan 2026 Feb 2026
2 Months active

Languages Used

JavaScriptMarkdownTypeScript

Technical Skills

Form HandlingFront End DevelopmentReactReact NativeState Managementdocumentation

Expensify/expensify-common

Oct 2024 Oct 2024
1 Month active

Languages Used

TypeScript

Technical Skills

Constants ManagementData Structuring

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