· Company-level planning suggestions to strengthen connections between different content within the Karrot
· Front-end(WebView) performance optimization work
· Achieved fastest initial loading speed in CSR environment with p75 LCP 1.07s, p75 FCP 0.34s

· Full-stack development of year-end content utilizing user data
· Proposed and implemented UX in the form of stories (like Instagram)
· Utilized Sanity and JSONata to combine static content with user data
· Performance benchmarks and optimization for a global environment
· Configured backend to serve approximately 30 million user data within p90 50ms (Korea, Canada, US, Japan)
· React, Vite, Sanity, JSONata, Fastify, SQLite

· Implementing routing core logic for a global website (Canada, US, Japan, UK)
· Tracking SEO metrics, creating strategies, and organizing sitemaps
· Fastify, Remix

· Landing page editing, development, and rendering tools for in-app campaigns
· Ability to build custom components (Component Registry and SDK)
· Atomic CSS libraries for building custom components utilizing Vanilla Extract Sprinkles
· Utilize Cloudflare CDN for caching of 10M-level instantaneous traffic
· Implement responsive images with Cloudflare Image Optimization

· GraphQL-based content platform backend for automating SEO optimization and sitemap building strategies
· Standardize caching capabilities utilizing Cache-Control headers
· Built with an event-sourcing pattern to rollback from user mistakes
· Node.js, Fastify, MongoDB, GraphQL

· Stack navigation library provides a combinatorial plugin interface
· Event-driven state machine design
· Automate company-wide PV metrics collection with plugin interface
· Zero-dependencies

· Mini-App Platform
· Developed a third-party integration Open API
· Developed a JavaScript SDK for third-party integration
· Developed the "My Favorites" section within the "Nearby" tab
· Full-stack development of profiles, review features, and more
· Node.js, GraphQL, Relay
· Launched affiliate services such as Washswat, Miso, Petner, Casting, CleaningLab, etc.

· Static web hosting services for affiliate service development
· Origin isolation (Custom Domain Integration)
· Utilize Cloudflare Workers, KV
· Utilize HTMLRewriter API to access execution context as a synchronous function

· Served as technical program manager for color system migration
· Convinced company-wide resources and assigned and managed team-specific schedules

· A shortcut service to help new services get into the marketplace
· Positioned at the top of the Home tab and designed other experiments

· Karrot's next-generation website
· Design and implementation of data layer (GraphQL) and page static generation (Next.js)
· Origin, Path standards with consideration for localization and universal linking
· SEO optimization

· Tool to automatically generate IPC interfaces between mobile native (iOS/Android) and webview
· JSON Schema-based
· TypeScript SDK, TypeScript SDK documentation auto-generation
· Automatic generation of Swift and Kotlin stubs
· Consider extensibility through plugin interfaces

· A library aimed at improving the overall UX of webviews
· Native transitional animation library based on react-router-dom
· Utilized by new businesses and services using WebView in Karrot
· (Now rebranded to "Stackflow")

· Job posting service in Karrot (New business)
· Application server development
· Node.js, GraphQL
· Optimizing GraphQL performance with the GraphQL JIT Executor and Persisted Queries

· Karrot's WebView deployment platform (former)
· Rollback and canary deployment features
· AB testing with canary deployment features
· <medium.com/daangn/d312b17…>

· Turning a Karrot search feature for used items from mobile native to a webview
· Native-level transition animation (shared element transition)

· A gRPC Service integration project with GraphQL
· Aggregate each microservice for easy use
· GraphQL representation of the relationships between domains within microservices, provided in SDL and GraphQL Voyager for easy understanding

· A server for sharing sessions between independent admin services within Karrot
· Node.js, GraphQL

· Revamping the WebView foundation within the overall Karrot iOS/Android client
· Establish communication conventions with iOS/Android clients and define workflows for native integration
· JavaScript SDK maintaining

· Developed the third tab of Karrot, the Nearby tab, as a WebView
· GraphQL Client Schema
· GraphQL Schema Stitching (@graphql-tools/stitch)
· Relay

· Transitioning an existing 1.0 MVP to React.js
· Leveraging Twilio Programmable Video
· Developing a plugin system and SDK with iframes

· Developing a real-time video lecture website with Vue.js
· Leveraging Twilio Programmable Video (WebRTC)

Engineering
· WebView Platform Development (Bridge Interface, Deployment System, etc.)
· Improving WebView UI/UX with Enhanced Transitions (Karrotframe)
· Website Platform

Product
· Developed and operated Nearby Tab
· Full-stack development of new services (Karrot 알바, Karrot Mini)
· Third-party integration SDK, OpenAPI development
· Migrate search feature from iOS/Android native to WebView

Engineering
· Real-time video lecture web application development
· Development of real-time data communication protocols and rendering engines
· Plug-in systems and scalable design

Product
· Developing a live broadcast platform MVP

· Rebuilding Kolon Industries' global branding website with React.js
· Leveraging Headless CMS (Directus)

· Event-sourcing library built on MongoDB

· MongoDB persistent integration in Nact.js

For an in-house product to be successful, it can't solve just one problem, it must solve multiple customers' problems at the same time

Here's the ultimate JavaScript monorepo setup I've settled on