callstack-internal/Expensify-App
Sep 2025 – Mar 2026
4 Months active
Languages Used
JavaScriptTypeScript
Technical Skills
Code RefactoringJavaScriptTestingTypeScriptReactReact Hooks
Michał Jasikowski
PROFILE
Michał Jasikowski
Michal Jasikowski focused on stabilizing and maintaining the Expensify-App repository over a five-month period, addressing six complex bugs that impacted reporting, onboarding, and navigation workflows. He applied his expertise in JavaScript, TypeScript, and React to implement targeted rollbacks and code refactoring, restoring proven behaviors and reducing user-facing inconsistencies. By reverting exploratory features and simplifying conditional logic, Michal preserved data integrity and ensured reliable user experiences across the app. His work emphasized regression readiness and backward compatibility, maintaining alignment with established UX patterns. This approach enabled safer future enhancements while minimizing disruption, reflecting a thoughtful, detail-oriented engineering process.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
6Total
Bugs
6
Commits
6
Features
0
Lines of code
6,223
Activity Months5
Work History
March 2026
1 Commits
Mar 1, 2026March 2026 (2026-03) highlights for callstack-internal/Expensify-App: Reverted the onboarding refactor that added the isSelfTourViewed check and removed the isSelfTourViewed parameter from payment onboarding and report actions, restoring the simpler onboarding flow. The rollback was implemented and captured in commit df121e9373b5879ee320eafd722ec3f96437463a. This work stabilizes the onboarding experience, reduces regression risk, and preserves business value for user activation and engagement.
1 Commits
Mar 1, 2026March 2026 (2026-03) highlights for callstack-internal/Expensify-App: Reverted the onboarding refactor that added the isSelfTourViewed check and removed the isSelfTourViewed parameter from payment onboarding and report actions, restoring the simpler onboarding flow. The rollback was implemented and captured in commit df121e9373b5879ee320eafd722ec3f96437463a. This work stabilizes the onboarding experience, reduces regression risk, and preserves business value for user activation and engagement.
March 2026
February 2026
2 Commits
Feb 1, 2026February 2026 (2026-02) — Focused on stabilizing the Expensify app by reverting exploratory changes that affected billing subtotals and dynamic account verification. There were no new features delivered this month; instead, two high-impact rollback fixes restored proven behavior, improved navigation consistency, and reduced risk of user-facing regressions. These actions protect reporting accuracy and core user workflows while laying groundwork for future, validated enhancements.
February 2026
2 Commits
Feb 1, 2026February 2026 (2026-02) — Focused on stabilizing the Expensify app by reverting exploratory changes that affected billing subtotals and dynamic account verification. There were no new features delivered this month; instead, two high-impact rollback fixes restored proven behavior, improved navigation consistency, and reduced risk of user-facing regressions. These actions protect reporting accuracy and core user workflows while laying groundwork for future, validated enhancements.
January 2026
1 Commits
Jan 1, 2026January 2026 (2026-01) — Focused on stabilizing report action visibility in Expensify-App by reverting a derived visibility change. This rollback restored the previous handling based on user permissions and report state, reducing UI inconsistencies across components and preserving expected workflows. The change minimizes risk from the updated visibility derivation and aligns with existing permission models, improving reliability for end-users and downstream integrations.
1 Commits
Jan 1, 2026January 2026 (2026-01) — Focused on stabilizing report action visibility in Expensify-App by reverting a derived visibility change. This rollback restored the previous handling based on user permissions and report state, reducing UI inconsistencies across components and preserving expected workflows. The change minimizes risk from the updated visibility derivation and aligns with existing permission models, improving reliability for end-users and downstream integrations.
January 2026
October 2025
1 Commits
Oct 1, 2025Month: 2025-10 — Focused on maintaining the Expensify-App repository (callstack-internal/Expensify-App). The month's notable activity was a targeted rollback of a previously implemented feature that prevented the creation of duplicate empty reports. This involved reverting the confirmation modal logic and removing the associated hook and language translations, effectively disabling the duplicate-prevention mechanism. No new features were delivered this month; the work centered on bug/behavior revert and codebase cleanup to preserve stability and alignment with existing UX expectations.
October 2025
1 Commits
Oct 1, 2025Month: 2025-10 — Focused on maintaining the Expensify-App repository (callstack-internal/Expensify-App). The month's notable activity was a targeted rollback of a previously implemented feature that prevented the creation of duplicate empty reports. This involved reverting the confirmation modal logic and removing the associated hook and language translations, effectively disabling the duplicate-prevention mechanism. No new features were delivered this month; the work centered on bug/behavior revert and codebase cleanup to preserve stability and alignment with existing UX expectations.
September 2025
1 Commits
Sep 1, 2025September 2025 monthly summary for the Expensify-App repository, focusing on stabilizing the Reports UI and maintaining reliable reporting workflows.
1 Commits
Sep 1, 2025September 2025 monthly summary for the Expensify-App repository, focusing on stabilizing the Reports UI and maintaining reliable reporting workflows.
September 2025
Activity
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Quality Metrics
Correctness90.0%
Maintainability83.4%
Architecture83.4%
Performance83.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
JavaScriptTypeScript
Technical Skills
Code RefactoringFull Stack DevelopmentJavaScriptReactReact HooksReact NativeTestingTypeScriptfront end developmentnavigation management
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline
margelo/expensify-app-fork
Feb 2026 – Feb 2026
1 Month active
Languages Used
JavaScriptTypeScript
Technical Skills
Reactfront end developmentnavigation management