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Jeong Arm

PROFILE

Jeong Arm

Over eight months, this developer contributed to mastodon/mastodon and thoughtbot/thoughtbot.social, focusing on both backend and front-end improvements. They enhanced content moderation and API reliability using Ruby on Rails, addressed caching and asset delivery issues, and improved user experience through refined navigation and UI synchronization in React and JavaScript. Their work included stabilizing video metadata extraction, implementing drag-and-drop link quoting, and ensuring real-time updates for domain management. By applying defensive programming, middleware configuration, and robust testing, they delivered features and bug fixes that improved workflow efficiency, policy correctness, and system maintainability across multiple repositories and technical domains.

Overall Statistics

Feature vs Bugs

40%Features

Repository Contributions

10Total
Bugs
6
Commits
10
Features
4
Lines of code
128
Activity Months8

Work History

May 2026

1 Commits • 1 Features

May 1, 2026

Mastodon development – May 2026: Delivered Domain Unblocking UI Synchronization in the mastodon/mastodon repo to ensure the UI reflects domain unblock events in real time and refreshes the blocked domains list via a dedicated callback. Fixed a blocking issue where unblocking a domain from the blocked domains column did not update the list, improving state consistency and user experience. The changes strengthen domain management flow and lay groundwork for future governance enhancements.

November 2025

2 Commits • 1 Features

Nov 1, 2025

November 2025: Focused on UX polish and UI reliability in Mastodon. Delivered two key changes: (1) drag-and-drop quoting of links in the compose form, streamlining link insertion and improving posting UX; (2) thread visibility icon synchronization to ensure the eye icon accurately reflects the thread's hidden/shown state. These updates increased content creation speed, reduced user confusion, and strengthened UI consistency, with clear commit traceability for future reviews.

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.

October 2024

1 Commits

Oct 1, 2024

Month: 2024-10. This period focused on stabilizing content moderation for link timelines and improving correctness of blocking rules. No new user-facing features were released; the work centered on debugging and applying blocking logic across the link timeline to align with policy expectations and language scopes. The change is small but affects content exposure and moderation accuracy, with traceability to issue #32625.

Activity

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Quality Metrics

Correctness91.0%
Maintainability88.0%
Architecture84.0%
Performance87.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

JavaScriptReactRubyTypeScript

Technical Skills

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

Repositories Contributed To

3 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 May 2026
3 Months active

Languages Used

RubyJavaScriptTypeScript

Technical Skills

API DevelopmentBackend DevelopmentRuby on RailsReactfront end development

altstoreio/mastodon

Oct 2024 Oct 2024
1 Month active

Languages Used

Ruby

Technical Skills

Backend DevelopmentRuby on Rails