Dongseok Paeng

Spearheaded a 4-member frontend team, fostering a culture of A/B testing and rapid prototyping that accelerated safe production deployments and enhanced collaboration with Product, Design, and Backend teams.

Led frontend development for Multi-Reward CPE, designing intuitive end-user reward UX and robust back-office tools, contributing to a 50-100% lift in ROAS metrics.

Engineered impression tracking using Intersection Observer and batched event delivery, which optimized network overhead and significantly improved company-wide analytics.

Achieved a ~90% reduction in API calls and 50% cut in first-screen render time (TTFP) through lazy loading, rendering strategy improvements, and request optimization, resulting in substantial backend cost savings.

Resolved domain-block-related API failures by implementing fallback routing strategies after identifying issues via Sentry and New Relic, recovering lost traffic and approximately $5K/day in revenue.

Pioneered the integration of Playwright E2E tests into CI, drastically increasing release confidence, reducing production incidents, and enabling more frequent, secure deployments.

Developed an internal Chrome extension to port the OW SDK to JavaScript, which streamlined UI development and debugging, subsequently forming the foundation for web expansion and automated E2E testing.

Architected and led the complete frontend development lifecycle for a new WebView-based mobile application using React Native, from ideation to successful launch on Google Play (US).

Built a full-featured classroom management web application, including interactive teacher dashboards and an MS OneNote add-in for efficient student work capture and management.

Engineered a custom Android WIFI manager to enable mandatory school proxy authentication, successfully resolving a key connectivity limitation for students and staff.

Developed and optimized multiple WebView-based applications and widgets, seamlessly integrating device features and native app functionalities.

Contributed significant performance improvements to open-source JavaScript libraries (e.g., Sizzle, Swiper) by profiling rendering and memory with Chrome DevTools, enhancing animation smoothness.

Contributed to the development and implementation of embedded web browsers tailored for feature phone platforms.

Designed, built, and successfully shipped a core Android email application, deploying it across a wide range of LG smartphones.