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Yeongjun Joo

PROFILE

Yeongjun Joo

Over nine months, Jihwan Kim developed and maintained the Techeer-Hogwarts/frontend repository, delivering 54 features and resolving 52 bugs to enhance user experience and code reliability. He built modular React and Next.js components, implemented robust API integrations, and introduced features like infinite scrolling, global search, and a bookmark management system. His work included refactoring for maintainability, improving onboarding flows, and strengthening error handling across UI and backend interactions. Using TypeScript and state management tools such as Zustand and React Query, Jihwan ensured scalable architecture and consistent UI/UX, demonstrating depth in both frontend and backend engineering throughout the project lifecycle.

Overall Statistics

Feature vs Bugs

51%Features

Repository Contributions

196Total
Bugs
52
Commits
196
Features
54
Lines of code
40,697
Activity Months9

Work History

July 2025

2 Commits • 2 Features

Jul 1, 2025

July 2025 Monthly Summary (Techeer-Hogwarts/frontend) focusing on delivering business value through two key user-facing features and related technical improvements. Overall impact: improved scheduling workflow for Summer bootcamps and enhanced media viewing experience during sessions.

June 2025

18 Commits • 3 Features

Jun 1, 2025

June 2025: End-to-end product improvements across frontend and backend, focusing on user engagement, onboarding clarity, and scalable bookmarking capabilities. Delivered the Blog Challenge with UI, API access, state management, and user notifications; refreshed onboarding/bootcamp content for clearer guidance and adoption; completed a Bookmark Management System backend with CRUD, soft delete, and enhanced category handling; fixed the Blog Challenge API credentials bug to restore reliable access. Implemented targeted refactors and environment/config cleanup to improve maintainability and stability.

May 2025

24 Commits • 4 Features

May 1, 2025

May 2025 — Techeer-Hogwarts/frontend delivered major frontend improvements across architecture, API consistency, onboarding experience, and UI polish. The work focused on reliability, maintainability, and a cohesive user experience that reduces support needs and accelerates feature delivery.

April 2025

4 Commits • 2 Features

Apr 1, 2025

April 2025: Focused on strengthening the Techeer-Hogwarts/frontend blog experience through targeted feature enhancements, robust data handling, and improved API reliability. Delivered new interaction patterns, refactored core modal flows into reusable hooks, corrected data modeling for likes, and tightened API error handling for blog uploads.

March 2025

29 Commits • 6 Features

Mar 1, 2025

March 2025 frontend work for Techeer-Hogwarts/frontend focused on delivering robust user-facing features, stabilizing API interactions, and modernizing the blog and session experiences. The month emphasized business value through reliable UI, faster iteration, and clearer code structure with stronger type safety.

February 2025

85 Commits • 16 Features

Feb 1, 2025

February 2025 (2025-02) - Techeer-Hogwarts/frontend monthly performance snapshot. Delivered user‑facing features with a strong emphasis on UX, reliability, and data integrity, while hardening the frontend against backend changes and edge cases. Notable outcomes include faster content loading through infinite scrolling, safer user interactions via ownership-based edits, and improved responsiveness with React Query caching and skeleton UI patterns.

January 2025

4 Commits • 2 Features

Jan 1, 2025

January 2025 (2025-01) focused on delivering core frontend capabilities that boost discoverability and editorial efficiency for Techeer-Hogwarts/frontend. Key work includes a Global Search integrated into the TabBar and SearchBar across blog, project, and resume pages, with an onSearch prop and search queries persisted in sessionStorage. Also delivered an API-driven Session Page, enabling fetch/best/single endpoints, UI updates for adding/editing sessions, and session video management (fetch/delete) with editing/viewing capabilities. Overall, these efforts improve user navigation, content management workflows, and data consistency across the app.

December 2024

8 Commits • 4 Features

Dec 1, 2024

December 2024, Techeer-Hogwarts/frontend focused on delivering core front-end enhancements to improve navigation, data accessibility, and media capabilities while stabilizing UI and aligning with backend workflows. Delivered four feature areas with concrete outcomes and incremental improvements to developer UX and content workflows. Key features delivered: - UI Navigation and Tab State Enhancements: direct routes and persistent tab selection across sessions. - Session Page Backend Integration and UI Improvements: backend API integration for dynamic session data, detailed views, deletion workflow, and a redesigned add-session modal. - Blog Data Integration and Blog UI Enhancements: fetch/display blog posts (including best blogs), and add/delete blog posts via modal with updated UI. - Session Media Support: video playback via React Player and file downloads; extended Session interface, with data fetching and UI updates to support media assets. Major bugs fixed: - State naming inconsistencies corrected to reflect current data models. - UI components adjusted for API changes; Storybook and component alignment updated for consistency. - Minor UI/UX regressions resolved to ensure stable navigation and modal workflows. Overall impact and accomplishments: - Significantly improved navigation efficiency and session/content accessibility, enabling faster user journeys and data-driven decisions. - Enabled dynamic session management and media experiences, expanding user capabilities to view details, add content, and access media without leaving the page. - Strengthened front-end quality with API-aligned components, stable modals, and consistent Storybook-driven UI. Technologies/skills demonstrated: - React front-end development, state management, and routing strategies. - Backend API integration (sessions, blogs) and modal-driven UI patterns. - Media playback with React Player, file downloads, and extended data models. - UI/UX improvements, Storybook alignment, and design-consistent components.

November 2024

22 Commits • 15 Features

Nov 1, 2024

November 2024 — Techeer-Hogwarts/frontend delivered substantial UI, routing, and maintainability improvements, plus backend session integration. Key features delivered include UI flexibility and consistency improvements, publishing polish for My Page, and reusable components that reduce duplication. Major fixes stabilized the build and routing, and code quality was enhanced through refactors and SonarCloud fixes. The work supports faster feature delivery, improved user experience, and stronger code health, with demonstrated proficiency in React/TypeScript, modular design, Storybook testing, API integration, and quality tooling.

Activity

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Quality Metrics

Correctness85.6%
Maintainability85.8%
Architecture78.6%
Performance83.8%
AI Usage21.4%

Skills & Technologies

Programming Languages

CSSHTMLJavaJavaScriptReactSVGTypeScripttsx

Technical Skills

API DevelopmentAPI IntegrationAccessibilityAnimationBackend DevelopmentCSSCSS StylingCode CleanupComponent DesignComponent DevelopmentComponent RefactoringComponent-Based ArchitectureComponentizationConfiguration ManagementCustom Hooks

Repositories Contributed To

2 repos

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

Techeer-Hogwarts/frontend

Nov 2024 Jul 2025
9 Months active

Languages Used

CSSHTMLJavaScriptReactTypeScripttsxSVG

Technical Skills

API IntegrationAccessibilityComponent DesignComponent DevelopmentComponent RefactoringComponent-Based Architecture

Techeer-Hogwarts/backend

Jun 2025 Jun 2025
1 Month active

Languages Used

Java

Technical Skills

API DevelopmentBackend DevelopmentConfiguration ManagementDatabase ManagementEnum UsageJPA

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