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Jeong Arm

PROFILE

Jeong Arm

Over five months, KJ Won contributed to thoughtbot.social and mastodon/mastodon by building and refining features that improved user experience and system reliability. They enhanced front-end workflows in React and JavaScript, such as streamlining modal interactions and status update navigation, while also addressing backend challenges in Ruby on Rails. KJ Won resolved caching inefficiencies and hardened asset delivery by normalizing HTTP headers, ensuring correct cache behavior across CDNs. In the Mastodon API, they enforced default policy application and added regression tests to maintain API integrity. Their work demonstrated depth in API development, caching strategies, and robust metadata handling across repositories.

Overall Statistics

Feature vs Bugs

33%Features

Repository Contributions

6Total
Bugs
4
Commits
6
Features
2
Lines of code
62
Activity Months5

Work History

September 2025

1 Commits

Sep 1, 2025

September 2025 focused on strengthening policy correctness and test coverage for the Mastodon API. Delivered a critical bug fix ensuring the user's default quote policy is applied when the quote policy parameter is omitted, and added regression tests to prevent future regressions. Maintained feature integrity in the mastodon/mastodon repository and improved API reliability for end users by aligning behavior with user defaults.

June 2025

1 Commits

Jun 1, 2025

June 2025 focused on hardening asset delivery and HTTP caching for thoughtbot.social. Delivered a critical bug fix to header normalization to ensure correct caching behavior for public/static assets across CDNs and browsers. The change addresses an incorrect Cache-Control header usage identified in issue #35209, linked to commit 87db28cebc65242b3591be819c39335dd8aa5507.

January 2025

2 Commits • 1 Features

Jan 1, 2025

January 2025 monthly summary for thoughtbot.social: Delivered UX-focused improvements to status updates navigation and addressed a caching inefficiency for the custom CSS digest. The changes enhance user workflow, performance, and reliability, aligning with product goals of faster access to updates and more predictable caching behavior.

December 2024

1 Commits

Dec 1, 2024

December 2024 monthly summary for thoughtbot.social focused on stabilizing video processing through a targeted bug fix. Delivered a defensive metadata handling improvement that safely accesses rotation data before evaluating its absolute value, preventing errors when rotation information is absent and ensuring reliable video metadata extraction. The change enhances reliability of media rendering and reduces runtime exceptions, contributing to a smoother user experience and lower support friction.

November 2024

1 Commits • 1 Features

Nov 1, 2024

November 2024 monthly summary focusing on key accomplishments, with emphasis on delivering business value and technical improvements within thoughtbot.social.

Activity

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Quality Metrics

Correctness88.4%
Maintainability90.0%
Architecture86.6%
Performance91.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

JavaScriptReactRubyTypeScript

Technical Skills

API DevelopmentBackend DevelopmentCachingDigest AlgorithmsFront End DevelopmentFront-end DevelopmentHelper MethodsJavaScriptMiddleware ConfigurationReactRuby on Rails

Repositories Contributed To

2 repos

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

thoughtbot/thoughtbot.social

Nov 2024 Jun 2025
4 Months active

Languages Used

JavaScriptReactTypeScriptRuby

Technical Skills

Front-end DevelopmentJavaScriptReactBackend DevelopmentCachingDigest Algorithms

mastodon/mastodon

Sep 2025 Sep 2025
1 Month active

Languages Used

Ruby

Technical Skills

API DevelopmentBackend DevelopmentRuby on Rails

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