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Lukasz Modzelewski

PROFILE

Lukasz Modzelewski

Lukasz Modzelewski delivered robust engineering improvements across Expensify/App and callstack-internal/Expensify-App, focusing on scalable UI, asset optimization, and CI/CD automation. He unified card data handling and advanced filtering, implemented SVG-driven UI enhancements, and stabilized transaction workflows. Lukasz applied React, TypeScript, and JavaScript to refactor middleware APIs, optimize asset pipelines, and expand test coverage with selector and unit tests. His work included introducing concurrency controls and workflow automation in YAML, improving build reliability and feedback loops. By addressing both feature delivery and code quality, Lukasz ensured maintainable front-end architecture and more reliable deployment processes across multiple repositories and platforms.

Overall Statistics

Feature vs Bugs

53%Features

Repository Contributions

116Total
Bugs
31
Commits
116
Features
35
Lines of code
38,211
Activity Months4

Work History

February 2026

34 Commits • 11 Features

Feb 1, 2026

February 2026 monthly summary for callstack-internal/Expensify-App focusing on delivering business value through feature delivery, reliability fixes, and CI/process improvements. The team shipped core improvements to TODOS handling, expanded test coverage, strengthened CI workflows, and stabilized the build/deploy process while maintaining code quality and performance.

January 2026

29 Commits • 4 Features

Jan 1, 2026

January 2026 delivered core improvements to card data handling, search, filtering, and CI/CD automation across Expensify/App and internal Expensify-App instances. Key features include unifying personal and workspace card lists with NON_PERSONAL_AND_WORKSPACE_CARD_LIST and a robust defaultExpensifyCardSelector (with useMemo optimizations and guard logic) to improve default card visibility in search and display. The Advanced Filter Form UX was enhanced with restored useFilterFormValues and synchronized advanced filters, improving filtering accuracy and search relevance. Card Visibility enhancements in callstack-internal/Expensify-App delivered clearer handling of personal vs non-personal/workspace cards, updated selectors, and added unit tests to ensure correct behavior. CI/CD workflows were improved to provide faster feedback and safer automation, including triggering on push, PR merge guards, OSBotify handling, and inclusion of build summaries. Overall impact includes more reliable card filtering, faster feedback loops, and stronger code quality across front-end features and deployment pipelines. Technologies demonstrated include React hooks (useMemo, useEffect), TypeScript typings, selectors, unit testing, and modern CI/CD practices.

October 2025

37 Commits • 15 Features

Oct 1, 2025

October 2025 performance summary: Delivered measurable business value across two Expensify repositories by stabilizing core APIs, accelerating UI rendering for transaction workstreams, and strengthening quality practices. Achievements include API refactor for middleware, scalable UI for transaction lists, architecture improvements for layout handling, offline UX enhancements, and expanded test coverage with stronger type safety.

September 2025

16 Commits • 5 Features

Sep 1, 2025

September 2025 across Expensify/App and margelo/expensify-app-fork: Delivered cross-repo SVG-driven UI improvements, asset optimization, and CI automation, delivering tangible business value through improved visuals, reduced asset footprint, and more reliable tests. Key outcomes include scalable, high-fidelity UI for empty states, mobile-friendly sign-in visuals, and a lean asset pipeline, alongside robust gradient definitions and animation improvements for consistent theming. Major bugs fixed include test reliability enhancements and gradient ID duplication fixes. Technologies demonstrated: SVG optimization, React/TypeScript, lint/test robustness, and CI/CD for asset pipelines.

Activity

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Quality Metrics

Correctness94.2%
Maintainability90.6%
Architecture88.4%
Performance89.0%
AI Usage22.6%

Skills & Technologies

Programming Languages

JSONJavaScriptSVGShellTypeScriptYAMLbashtsxtypescript

Technical Skills

API IntegrationAndroid DevelopmentAnimationAsset ManagementAsset OptimizationCI/CDCLI ScriptingCode CleanupCode FormattingCode HygieneCode LintingCode QualityCode RefactoringCodebase MaintenanceComponent Architecture

Repositories Contributed To

3 repos

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

callstack-internal/Expensify-App

Oct 2025 Feb 2026
3 Months active

Languages Used

JavaScriptTypeScriptYAMLJSONbashtypescript

Technical Skills

API IntegrationFrontend DevelopmentJavaScriptReactState ManagementTypeScript

margelo/expensify-app-fork

Sep 2025 Oct 2025
2 Months active

Languages Used

JavaScriptSVGShellTypeScripttsx

Technical Skills

Asset ManagementAsset OptimizationCI/CDCLI ScriptingCode CleanupCode Quality

Expensify/App

Sep 2025 Jan 2026
2 Months active

Languages Used

JavaScriptSVGTypeScript

Technical Skills

Component RefactoringFrontend DevelopmentJestReact NativeSVG IntegrationTesting

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