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YONGJAE LEE (이용재)

PROFILE

Yongjae Lee (이용재)

Over ten months, contributed to Apache Zeppelin and related open-source projects by building and refining front-end features, modernizing test automation, and improving developer tooling. Delivered UI enhancements such as dynamic note titles, dark mode, and keyboard shortcut synchronization using Angular, React, and TypeScript. Strengthened authentication flows and introduced micro-frontend architecture with Webpack Module Federation. Focused on end-to-end test reliability in Playwright and Cypress, addressing flakiness and improving CI feedback. Upgraded ESLint configurations and streamlined code quality gates. Work in repositories like apache/zeppelin and module-federation/core emphasized maintainable, accessible interfaces and robust automation, reducing regression risk and accelerating release cycles.

Overall Statistics

Feature vs Bugs

47%Features

Repository Contributions

38Total
Bugs
17
Commits
38
Features
15
Lines of code
961,562
Activity Months10

Work History

July 2026

1 Commits

Jul 1, 2026

July 2026: Focused on stabilizing the Cypress test suite in module-federation/core by removing redundant per-spec uncaught:exception suppression to surface real exceptions. This change leverages the global Cypress support handler to manage known errors, allowing real unexpected failures to surface and be addressed earlier. Implemented in the memory-router happy-path spec; merged as PR #4826 with commit 4b898c4a4d720d9e4d91925bd3dbd9b32ea3b94b. Result: more reliable tests, faster feedback, and reduced flaky test noise in CI and local runs.

June 2026

8 Commits • 2 Features

Jun 1, 2026

June 2026 monthly summary focusing on tooling modernization, UX improvements, and test reliability across multiple repos. Highlights include: - ESLint config migration to ESLint 9 flat format in Apache Zeppelin to align linting with modern tooling and resolve cross-merge regressions; - UX improvement in Zeppelin New UI with auto-focused paragraph editor after clone/insert and cursor positioning to streamline authoring and preserve content during programmatic updates; - Stabilization of Playwright-based E2E tests in Zeppelin by addressing login race conditions, input handling, and modal transitions, reducing flaky runs; - Re-enabling Heart tests in Code Server with updated assertions to validate visibility, improving UI test reliability; - Addressing missing awaits in Playwright client assertions in SvelteKit to ensure coverage and reduce false positives. Overall impact includes reduced CI flakiness, faster feedback loops, and a more dependable foundation for future features. Technologies/skills demonstrated include ESLint v9 tooling migrations, Playwright end-to-end automation and resilience patterns, asynchronous testing with proper awaits, cross-repo CI hygiene, and UX-focused UI improvements.

April 2026

2 Commits • 1 Features

Apr 1, 2026

April 2026 monthly summary for Apache Zeppelin focused on end-to-end testing enhancements and coverage for notebook components. This work delivered measurable reliability improvements, expanded test coverage for core notebook features, and demonstrated strong automation and code quality skills across the E2E suite.

March 2026

5 Commits • 1 Features

Mar 1, 2026

March 2026 performance and contribution summary across Zeppelin, Element Web, and Cal.com. Delivered frontend modernization, security hardening, and test reliability improvements that reduce risk, improve user experience, and enable faster future delivery.

February 2026

2 Commits • 1 Features

Feb 1, 2026

February 2026: Delivered enhancements to Zeppelin's E2E test coverage, focusing on the Share Area and Notebook flows. Consolidated test utilities and refactored UI test suites to improve coverage, reliability, and maintainability. No production defects were closed this month; instead, efforts were directed at strengthening the test automation foundation to reduce regression risk and accelerate future delivery.

December 2025

2 Commits • 1 Features

Dec 1, 2025

December 2025 — Apache Zeppelin: E2E test quality and stability improvements, environment refinements, and CI optimizations to reduce flakiness and accelerate releases. Delivered features include code-quality gates for E2E tests, environment cleanup utilities, and a reorganized test harness with clearer separation of configuration and utilities.

November 2025

1 Commits

Nov 1, 2025

Month: 2025-11 | Apache Zeppelin: Focused on test reliability and stability. Delivered a critical bug fix by rolling back Playwright from 1.56.1 to 1.55.1 to fix failing WebKit tests, restoring CI confidence and preventing flaky builds. No new user-facing features this month; the business value came from stabilizing the test suite, ensuring faster and more reliable releases.

October 2025

5 Commits • 4 Features

Oct 1, 2025

In October 2025, focused on strengthening security and UX in Apache Zeppelin while enhancing test reliability and CI coverage. Delivered major features across the New UI, fortified login flow, introduced dark mode with persistence, and added safeguards to prevent unintended execution of unpublished content. Elevated end-to-end testing with conditional authentication, mode matrix in CI, and robust login prerequisites, addressing flaky tests and improving reliability. Demonstrated strong skills in frontend architecture, authentication guards, UI theming, and test automation, delivering measurable business value by reducing risk and improving user experience.

September 2025

10 Commits • 4 Features

Sep 1, 2025

September 2025: Delivered notable UI/UX improvements in Apache Zeppelin, aligned the New UI with Classic UI expectations, and established a more solid development foundation through tooling upgrades. The month focused on enhancing editor reliability, keyboard accessibility, and responsive behavior, while reducing divergence between UI modes and improving the developer experience.

August 2025

2 Commits • 1 Features

Aug 1, 2025

August 2025: Focused on improving the New UI navigation and consistency for apache/zeppelin. Delivered two targeted changes: a dynamic note title in the New UI and a fix to redirect users to Home after trashing a note, reinforcing UX parity with the Classic UI and reducing navigation friction. These changes were implemented via targeted commits and Jira-linked work, enhancing user satisfaction and reducing context switching.

Activity

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Quality Metrics

Correctness92.6%
Maintainability86.8%
Architecture86.4%
Performance84.8%
AI Usage27.4%

Skills & Technologies

Programming Languages

CSSHTMLJSONJavaJavaScriptShellTypeScriptYAML

Technical Skills

AngularAuthenticationBuild ToolsCI/CDCSSCode QualityCode RefactoringConfiguration ManagementCypressESLintEnd-to-End TestingFront End DevelopmentFront-end DevelopmentFrontend DevelopmentGit

Repositories Contributed To

9 repos

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

apache/zeppelin

Aug 2025 Jun 2026
9 Months active

Languages Used

JavaScriptTypeScriptCSSHTMLJavaShellYAMLJSON

Technical Skills

AngularFront End DevelopmentBuild ToolsCSSCode QualityConfiguration Management

element-hq/element-web

Mar 2026 Mar 2026
1 Month active

Languages Used

TypeScript

Technical Skills

PlaywrightTypeScriptend-to-end testing

calcom/cal.com

Mar 2026 Mar 2026
1 Month active

Languages Used

TypeScript

Technical Skills

PlaywrightTypeScriptend-to-end testing

coder/code-server

Jun 2026 Jun 2026
1 Month active

Languages Used

TypeScript

Technical Skills

JavaScriptTypeScriptend-to-end testingtestingunit testing

sveltejs/kit

Jun 2026 Jun 2026
1 Month active

Languages Used

JavaScript

Technical Skills

JavaScriptPlaywrighttesting

strapi/strapi

Jun 2026 Jun 2026
1 Month active

Languages Used

TypeScript

Technical Skills

JavaScriptTypeScriptUI testingend-to-end testing

usebruno/bruno

Jun 2026 Jun 2026
1 Month active

Languages Used

TypeScript

Technical Skills

PlaywrightTypeScripttesting

mui/mui-x

Jun 2026 Jun 2026
1 Month active

Languages Used

TypeScript

Technical Skills

TypeScriptend-to-end testingtest automation

module-federation/core

Jul 2026 Jul 2026
1 Month active

Languages Used

TypeScript

Technical Skills

CypressTypeScripttesting