Sungjoon Lee
Community@SJLee-0525 · Seoul
Sungjoon Lee provides frontend engineering skills covering React state management, web performance auditing, authentication patterns, security hardening, and Git conventions.
Agent Skills by Sungjoon Lee
Showing 9 vetted skills indexed across 1 GitHub repositories.
SJLee-0525git-branch-strategy
Creates and manages Git branches using a simplified main-plus-feature workflow for solo projects.
SJLee-0525fixing-motion-performance
Audit and fix CSS and JavaScript animation performance issues including layout thrashing and scroll-linked motion.
SJLee-0525auth-implementation-patterns
Implement JWT, OAuth2, session, and RBAC authentication patterns for Node.js APIs.
SJLee-0525git-commit-convention
Generates Git commit messages following a typed Korean-language convention.
SJLee-0525react-state-management
Implements React state management patterns using Redux Toolkit, Zustand, Jotai, and React Query.
SJLee-0525frontend-ui-engineering
Builds accessible, responsive, production-quality user interfaces following design system standards.
SJLee-0525security-and-hardening
Hardens web application code against injection, XSS, SSRF, and supply-chain vulnerabilities.
SJLee-0525web-perf
Audits web performance using Chrome DevTools MCP traces and Core Web Vitals analysis.
SJLee-0525humanizer
Rewrites AI-sounding prose using 35 detection patterns from Wikipedia's Signs of AI writing.
Frequently Asked Questions About Sungjoon Lee
FAQPage SchemaWhat tasks can I accomplish with Sungjoon Lee's skills?▼
You can build accessible production-quality React interfaces, manage global and server state with Redux Toolkit, Zustand, Jotai, or React Query, audit Core Web Vitals, fix animation performance issues, implement JWT/OAuth2 authentication, harden code against vulnerabilities, and generate convention-compliant Git commits and branches.
Who are these skills designed for?▼
Frontend and full-stack engineers building React applications, developers securing APIs and user sessions, and solo developers needing simple Git branch strategies and commit message conventions. They also suit anyone auditing site speed, Lighthouse scores, or WCAG accessibility compliance.
How do the web performance skills work in practice?▼
The web-perf skill uses Chrome DevTools MCP to measure LCP, INP, CLS, FCP, TBT, and Speed Index, then identifies render-blocking resources, network dependency chains, layout shifts, and caching issues. The motion skill audits layout thrashing, compositor properties, and scroll-linked animations.
Are these skills open source and what do they cost?▼
The humanizer skill is explicitly licensed under MIT (version 2.11.2), making it free to use and modify. Other skills in the manifest do not specify licenses, so users should check individual skill repositories for terms before commercial use.
What prerequisites or dependencies do these skills require?▼
The web-perf skill requires Chrome DevTools MCP for metric retrieval. React state skills assume a React project using Redux Toolkit, Zustand, Jotai, or React Query. Security skills apply when handling untrusted input, user sessions, third-party integrations, or personal data under GDPR/CCPA.