유지석 (Yoo Ji-seok)

Frontend Engineer

Seoul, KR.

About

Highly skilled Frontend Engineer passionate about creating aesthetically pleasing and functionally robust user interfaces, balancing usability with cutting-edge development. Proven ability to identify and solve complex technical challenges, exemplified by optimizing Next.js SSR to SSG/ISR, which reduced server response time by 75%. Driven by a data-centric approach and user feedback, I consistently deliver optimal solutions that enhance user experience and system efficiency.

Work

Dayone Company Coloso

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Frontend Engineer

Seoul, Seoul, Korea (Republic of)

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Summary

Frontend Engineer at Coloso, responsible for optimizing service rendering strategies, enhancing portfolio service performance, and improving client-side navigation for superior user experience and efficiency.

Highlights

Optimized Next.js rendering strategies (SSG/ISR, caching) to reduce server response time by 60-75% (from 800ms to 200ms) and decrease infrastructure costs.

Enhanced Coloso portfolio service performance, generating 61,000 monthly sessions, 58,000 user inflows, and 34,000 new users by implementing dynamic Masonry layouts and virtual scrolling.

Reduced rendering costs by 46.8% and scripting time by 42.3% through Virtual Scrolling and memoization techniques in high-volume image environments.

Improved client-side navigation, eliminating page flickering and reducing total execution time by 46.2% and scripting time by 78% by optimizing rendering processes.

Enhanced maintainability and code efficiency by refining routing logic with less than 20 lines of code, utilizing custom hooks and event delegation.

Volunteer

Mentor

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Fast Campus Dev Camp

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Mentored aspiring developers in the Fast Campus Dev Camp, providing technical guidance and code review.

Highlights

Conducted over 40 real-time mentoring sessions across 2 cohorts, guiding mentees with technical advice and feedback to foster their growth.

Performed comprehensive code reviews for React-based projects, ensuring best practices and efficient solutions.

Education

Hansung University

Seoul, Seoul, Korea (Republic of)
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Bachelor of Arts Fashion Design Grade:

Languages

Korean

English

Skills

Frontend Development

React, Next.js, JavaScript, HTML, CSS, UI/UX Design, Virtual DOM.

Web Performance Optimization

SSR (Server-Side Rendering), SSG (Static Site Generation), ISR (Incremental Static Regeneration), Caching, Rendering Optimization, Load Balancing, Traffic Management, Memoization, Virtual Scrolling.

Software Development Practices

Code Review, Problem Solving, Data Analysis, User Feedback Integration, Technical Documentation, Event Delegation, Custom Hooks, Routing Optimization, Maintainability, Code Efficiency.

Development Tools

Git, GitHub, Supabase.

Projects

Supabase Official Documentation Contribution

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Summary

Contributed to the official Supabase documentation, improving accuracy and clarity for users.

React Official Documentation Contribution

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Summary

Contributed to the official React documentation, enhancing the quality of code examples and overall clarity.

GENCON Conference Landing Page

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Summary

Developed an interactive landing page for the GENCON conference to achieve business goals and enhance user engagement.