EXCEEDS logo
Exceeds
Jakub Korytko

PROFILE

Jakub Korytko

Jakub Korytko engineered robust authentication and user experience improvements for Expensify-App, focusing on multifactor and biometric security, seamless cross-platform flows, and enhanced telemetry. He integrated biometric groundwork and SecureStore enhancements using Swift, Kotlin, and TypeScript, aligning authentication logic across iOS and Android. Jakub delivered scalable multifactor authentication with ED25519 cryptography, custom React hooks, and reducer-based state management, while refining UI components and localization for onboarding and device compatibility. His work included optimizing performance, stabilizing offline flows, and instrumenting telemetry for business-critical features, demonstrating depth in full stack mobile development and a strong emphasis on maintainable, testable code quality.

Overall Statistics

Feature vs Bugs

58%Features

Repository Contributions

126Total
Bugs
27
Commits
126
Features
37
Lines of code
24,513
Activity Months4

Work History

March 2026

52 Commits • 21 Features

Mar 1, 2026

March 2026 monthly work summary for Expensify-App focused on delivering UI improvements, telemetry instrumentation, performance enhancements, and reliability improvements across core flows (Search, Transactions, Reports) with emphasis on business value and robust testing.

February 2026

25 Commits • 3 Features

Feb 1, 2026

February 2026: Delivered targeted frontend improvements and localization for Expensify-App, while hardening offline/auth flows and PR workflows. Key outcomes include UI polish on the Prompt Page, a new Unsupported Device screen, Parrot language support, and significant bug fixes to PR comments/CI, offline authentication, and code quality that reduce user friction and improve reliability across MFA, registration, and protected routes. These efforts demonstrate strong frontend engineering, user-centric UX, and robust localization capabilities with measurable business impact in onboarding, device compatibility, and developer workflow.

January 2026

45 Commits • 11 Features

Jan 1, 2026

January 2026 focused on hardening security, reliability, and user experience for MFA-enabled flows across Expensify apps, with parallel work on UI, cryptography, context/state management, and test infrastructure. The efforts elevated security posture, reduced risk, and strengthened CI feedback loops, while delivering scalable MFA capabilities and improved user authentication UX.

September 2025

4 Commits • 2 Features

Sep 1, 2025

September 2025 focused on strengthening authentication security and cross‑platform consistency by delivering biometric groundwork and SecureStore enhancements across two related Expensify repositories. The work sets the foundation for biometric login, secure data handling, and improved UX around secure storage prompts, with targeted iOS/Android considerations and patches to underlying platform integrations.

Activity

Loading activity data...

Quality Metrics

Correctness89.2%
Maintainability85.2%
Architecture85.6%
Performance84.6%
AI Usage26.8%

Skills & Technologies

Programming Languages

JSONJavaScriptKotlinSwiftTypeScriptXMLYAML

Technical Skills

API RefactoringAPI designAPI developmentAPI integrationAndroid DevelopmentAuthenticationCI/CDCross-Platform DevelopmentCustom HooksDependency ManagementDevOpsESLintExpoFront End DevelopmentFrontend Development

Repositories Contributed To

3 repos

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

callstack-internal/Expensify-App

Jan 2026 Mar 2026
3 Months active

Languages Used

JavaScriptTypeScriptXMLYAMLJSON

Technical Skills

API developmentCustom HooksJavaScriptMobile DevelopmentReactState Management

Expensify/App

Sep 2025 Jan 2026
2 Months active

Languages Used

YAMLJavaScriptTypeScript

Technical Skills

Dependency ManagementMobile DevelopmentiOS DevelopmentAPI integrationJavaScriptJest

software-mansion-labs/expensify-app-fork

Sep 2025 Sep 2025
1 Month active

Languages Used

KotlinSwiftTypeScript

Technical Skills

API RefactoringAndroid DevelopmentAuthenticationCross-Platform DevelopmentExpoMobile Development