As an experienced software engineer, I have consistently delivered high-performance web and mobile products through data-driven agile development. Leveraging deep experience in monorepo management, CI/CD, and DevOps, I lead end-to-end initiatives—from frontend architecture design to development, deployment, and operations—driving scalability and efficiency across both large-scale and fast-moving teams.

• Orchestrated the end-to-end architecture, deployment, and operational infrastructure of the Table Order service while enabling and mentoring Front-end engineers

• Engineered a high-performance, fault-tolerant platform using SSR-based React and Next.js

• Implemented observability with Prometheus, OpenTelemetry, and Grafana Loki, elevating service availability to 99.995% through real-time dashboards and alerting

• Owned and scaled the Monorepo platform supporting 100+ frontend engineers and 50+ microservices; standardized tooling (shared libraries, SSR frameworks) and streamlined CI/CD and DevOps to enable 50+ reliable deployments per day
• Shipped credit card recommendation, teen banking, and guest remittance features with React and Next.js, serving 10M+ MAU; applied A/B testing and rapid iteration to lift user satisfaction and conversion
• Designed a front-end auto-logging system that captured UI events by traversing React nodes and the DOM in real time with zero-code adoption; reduced migration overhead, strengthened data integrity, collected 100M+ events/day, and standardized it as the default logging layer across Toss frontend applications

• Delivered a React Native/WebRTC video calling app that expanded users from 3,000 to 1.5M at launch; maintained high-quality JavaScript and partnered with cross-functional teams to refine integration and UX
• Crafted native-caliber animations and interactions—swipe tabs and bottom sheets—in React Native, and enabled real-time interactive multiplayer games using WebRTC

• Co-founded a media-tech startup and built a music recommendation service with React Native and Node.js end-to-end; launched the product and raised seed investment

• JavaScript, TypeScript, React, React Native, Next.js

• Node.js, Docker, Kubernetes, AWS, Nginx, Terraform

• Git, CircleCI, Prometheus, Opemtelemetry, Grafana Loki, Grafana Mimir, Jaeger

• Webpack, Rollup, Vite, Babel, Yarn, PNPM, Lerna, Turborepo