Jaewon Kim
Frontend Developer at Toss Securities
Seoul, South Korea
Summary
👤
Senior🎓
Top SchoolJaewon Kim is a frontend developer with over 10 years of experience building high-performance, real-time trading and consumer web applications using React and modern state management patterns. At Toss Securities he architects and implements latency-sensitive trading features, WebSocket-driven real-time UIs, and cross-market funnels while optimizing rendering and build-time computation to keep interfaces responsive under heavy load. He has a strong track record of creating team libraries (Recoil access outside React), test-friendly utilities, and automated tooling like SVG optimizers and logging systems that improved developer and designer workflows. Past roles include leading a cryptocurrency exchange rewrite with TDD and GraphQL adoption, and implementing custom encryption and KYC flows—skills that blend security, reliability, and product-focused frontend engineering. Based in Seoul, he pairs deep performance optimization techniques (time slicing, lazy loading, batch updates) with pragmatic engineering that surfaces in measurable stability gains during peak trading periods.
10 years of coding experience
6 years of employment as a software developer
학사, 컴퓨터공학, 3.4, 학사, 컴퓨터공학, 3.4 at 서울과학기술대학교
Stackoverflow
126reputation
18kreached
8answers
0questions
Github Skills (116)
displays10
css-in-js10
styled-components10
linting10
uikit10
javascript10
compiler10
gatsby10
wai-aria10
static-site-generator10
eslint10
gatsby-plugin10
fastest10
arrow-functions10
gatsbyjs10
Programming languages (8)
Github contributions (5)
wonism/react-mail-form
May 2018 - Jan 2020
React component for simple contact form with zero dependencies
Contributions:3 releases, 12 commits, 4 PRs in 1 year 8 months
react-componentmailreactdependencieszero
wonism/use-memory-storage
Oct 2019 - Dec 2020
React hooks for memory storage is sharing session storage between multiple tabs.
Contributions:1 release, 4 commits, 1 PR in 1 year 2 months
memoryreactreact-hookssharingsession-sharing
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