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Agata Kosior

PROFILE

Agata Kosior

Worked on Expensify/App and its forks, delivering features such as workspace upgrade flows, reporting workflows, and robust multi-step navigation. Focused on improving user experience and reliability by refining navigation logic, implementing internationalized reporting, and enhancing offline data handling. Used JavaScript and TypeScript with React and React Native to build UI components, manage state, and enforce type safety. Addressed over 100 bugs, emphasizing code quality through consistent linting, formatting, and refactoring. Contributed to business value by reducing onboarding time, improving financial reporting accuracy, and ensuring maintainability across repositories through rigorous testing, code organization, and policy-driven workflow enhancements.

Overall Statistics

Feature vs Bugs

16%Features

Repository Contributions

282Total
Bugs
109
Commits
282
Features
21
Lines of code
7,317
Activity Months5

Work History

March 2026

33 Commits • 4 Features

Mar 1, 2026

March 2026 monthly summary for callstack-internal/Expensify-App focused on delivering reliable multi-step flows, UI polish, and code quality improvements that collectively increase user confidence and developer velocity. Key features delivered include Flow Completion Handling to finalize steps and ensure correct end-state transitions, and Navigation and Step Sequencing Improvements that provide explicit navigation between main steps, backTo support, animation polish, and reliable transitions across wallet, workspace, and account pages. Additionally, UI/Code Quality Fixes and Minor Improvements improved input focus behavior, prop naming, Onyx state relocation, and formatting for better maintainability. Major bugs fixed covered currency-related navigation, signer info data retrieval, pagination reliability, and TypeScript typings, along with ESLint alignment to satisfy linting rules. These fixes reduce risk in financial flows, improve data correctness, and stabilize the codebase for faster iteration. Technologies and skills demonstrated include TypeScript typings, ESLint remediation, Onyx store usage, and React navigation patterns, underscoring proficiency in building reliable user journeys and maintainable, high-quality code.

February 2026

46 Commits • 2 Features

Feb 1, 2026

February 2026 (2026-02) monthly summary for callstack-internal/Expensify-App. Highlights include delivery of Quick Action, FAB Create Report button, navigation and multi-page flow stabilization, offline-ready data loading improvements, memoization enhancements, and code-quality / type-safety improvements. These efforts reduce user friction, improve resilience, and strengthen maintainability, delivering business value through faster, more reliable flows and improved offline experience.

January 2026

33 Commits • 4 Features

Jan 1, 2026

January 2026 performance summary for Expensify platform: Delivered key features and major bug fixes across Expensify/App and internal Expensify-App with a strong focus on business value, reliability, and code quality. Activities emphasized tax accuracy, policy alignment, reimbursement flow robustness, and offline resilience, complemented by targeted code quality improvements.

October 2025

90 Commits • 7 Features

Oct 1, 2025

October 2025 performance highlights for software-mansion-labs/expensify-app-fork: Delivered a workspace-centric reporting workflow, default workspace behavior, unreported-expenses reporting option, and report-field integration. Implemented broad navigation and UI polish, paywall gating alignment, and rigorous code-quality improvements to reduce defects and improve maintainability. Business impact includes faster onboarding, reduced misreporting, and improved policy applicability across workspace expenses.

September 2025

80 Commits • 4 Features

Sep 1, 2025

September 2025 monthly summary focusing on delivering core features, improving upgrade and reporting UX, and stabilizing codebase across Expensify/App and its fork. Major momentum came from upgrading the Workspace flow, introducing and internationalizing the reports feature, and enhancing upgrade/navigation in the fork. These changes reduce onboarding time, improve financial reporting accuracy, and boost maintainability through consistent linting, type checking, and dependency management.

Activity

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Quality Metrics

Correctness87.2%
Maintainability86.2%
Architecture82.8%
Performance84.4%
AI Usage23.8%

Skills & Technologies

Programming Languages

JavaScriptTypeScript

Technical Skills

API DevelopmentAPI IntegrationAPI integrationAccess ControlAction HandlingBug FixingCode FormattingCode OrganizationCode RefactoringConditional RenderingCustom HooksESLintFront End DevelopmentFront-end DevelopmentFrontend Development

Repositories Contributed To

3 repos

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

software-mansion-labs/expensify-app-fork

Sep 2025 Oct 2025
2 Months active

Languages Used

JavaScriptTypeScript

Technical Skills

API IntegrationAction HandlingBug FixingCode FormattingCode RefactoringConditional Rendering

callstack-internal/Expensify-App

Jan 2026 Mar 2026
3 Months active

Languages Used

JavaScriptTypeScript

Technical Skills

API integrationCode RefactoringReactSoftware MaintenanceTypeScriptfront end development

Expensify/App

Sep 2025 Jan 2026
2 Months active

Languages Used

JavaScriptTypeScript

Technical Skills

Code FormattingFront-end DevelopmentFrontend DevelopmentInternationalizationLintingLocalization