Jin Choi

About Jin Choi

I am a product/customer-oriented Full Stack Developer that specializes in React, with…

Experience

1. Technical Lead

   SpotOn

   Mar 2022 — Present

   Significantly decreased average LCP time by educating team on this core web vital, diagnosing issues through Lighthouse and creating tickets to improve this metric through font/image loading optimization, lazy loading modals, and more - Introduced integration testing with React Testing Library as the dominant testing strategy of app and established architecture with msw and component rendering utils to facilitate reliable and effective tests - Prevented memory issues by educating team members on the drawbacks of over-usage of React memoization hooks - Greatly improved application responsiveness by diagnosing app with React profiler and discovering a lack of re-render batching, which was solved with an upgrade of React to v18 - Implemented load testing script in k6 and process to catch latency issues in QA before releasing to production - Mentored junior developer into becoming a mid level developer by teaching best practices and an attitude of learning - Sped time to resolution of critical production issues by implementing monitors in Datadog that alerted the on-call team member when critical endpoints had elevated error rates - Solutioned migration of asap order logic to the backend by negotiating a new backwards-compatible contract with a standardized error handling system - Improved reliability and maintainability of app through refactoring of over-abstracted components with the container/presentational component architecture

Skills

• Cascading Style Sheets (Css)
• React.js
• Mocha
• Express.js
• Webpack
• Mongodb
• Agile Methodologies
• Redux
• Ecmascript
• Angularjs
• Jquery
• Representational State Transfer (Rest)
• Search Engine Optimization (SEO)
• Mysql
• Node.js
• Enzyme
• Javascript
• Postgresql
• Amazon Web Services (Aws)
• Html5
• Bootstrap
• Git
• Test Driven Development
• Sass
• Xml