Yong Jae Lee

Front-End Engineer at SNOW

Built and operated the cake.day web client, implementing core functions such as video learning and quiz features, designed multilingual processing for over 20 languages, and handled payment integrations. Ensured quality assurance throughout the development process.

Front-End Developer at 11STREET Corp

Contributed to the Progressive UI Library, transitioned to Redux-toolkit, improved mobile customer center, and resolved legacy jQuery issues in shopping cart functionalities.

Intern at NanoCellect Biomedical, Inc.

Worked on ERP Visualization and live data exposure, implemented verification logic, and developed an automation tool for non-development staff.

Frontend Engineer at 1 Street Corp. (SK subsidiary, 10M+ MAU e-commerce)

Frontend engineer on Development Team 1 for the SK subsidiary. Improved DX of main/promo pages, migrated Redux to Redux Toolkit, applied TypeScript to untyped areas, added Storybook docs, expanded E2E test coverage from 56% to 79%. Built display blocks for cross-border listings and time-limited deals; fixed legacy jQuery issues in mobile cart/gift flows; improved Vue-based mobile customer center.

Frontend Engineer at Cake (cake.day PC web client, Cake language-learning app)

Sole frontend engineer on the cake.day PC web client. Built features including video learning, quizzes, payment flow, AI creator pages, and in-app WebView bridge; added RTL support and multilingual UI for 20+ languages with a self-built i18n system; created a Canvas API utility for dynamic text-width calculation; owned web payment integration, evaluated PG vendors, designed recurring payment API specs; reduced fees from 30% to 3% and implemented BFF security layer (Next.js middleware, HttpOnly cookies, input sanitization, CSP headers); set up Jotai state management and API layer on top of Jotai atoms.

Software Engineering Intern at NanoCellect Biomedical, Inc.

Maintained Flask web app (Jinja, jQuery, PostgreSQL, Redis, Heroku) for ERP data visualization.