Herbert Lim Email & Phone Number

Ktown4U sells K-Pop albums and merchandise to over 200 countries worldwide, and its sales have increased 16 times over six years, reaching approximately 222.4 billion KRW in 2022.[Gradual Transition to New Frontend Tech Stack] •Gradually transitioning the JSP-based e-commerce site to Next.js on a page-by-page basis •Gradually converting the legacy warehouse management system to React + MUI •Developing a React Native app for the logistics center PDA to improve usability for picking and inventory tasks[Operating Next.js Server to Handle Sudden Event Traffic] •Applied DNS lookup cache to reduce event loop blocking caused by dns.lookup, lowering regular dns.lookup to 1/3 ~ 1/5 of its previous level •Improved p95 latency for backend API by using a private domain name (reduced from 52ms to 13ms) •Managed CF parameters and policies and controlled Cache-Control in Next.js response headers to optimize AWS CloudFront (CF) caching, reducing traffic to the Next.js server. Particularly used stale-while-revalidate to prevent cache stampede •Discovered that server-side rendering of event pages with over a thousand products caused event loop blocking and increased latency, resolved by converting the product list within the event page to CSR, reducing p99 latency from over 3 seconds to around 700ms

주요 업무- React Native 고객앱과 파트너앱 개발- 마켓플레이스 사업부를 위한 백엔드 서비스와 어드민 개발- 채팅 서비스 개발 및 유지보수[고객과 파트너 간의 1:1 채팅 기능 추가]서비스를 예약한 고객과 견적을 제출한 파트너가 서비스와 견적에 대해 협의할 수 있는 1:1 채팅 서비스를 개발하여 채팅을 선호하는 사용자를 지원하고 고객/파트너 간의 커뮤니케이션을 분석하여 서비스 품질 향상에 기여함채팅 플랫폼을 결정하고, 고객앱, 파트너앱, 백엔드까지 모두 직접 설계하고 구현함기술: StreamChat, rn-gifted-chat, serverless, AWS Lambda, SQS[푸시알림(Push notification) 품질 개선]안드로이드 앱에서 푸시알림을 선택했을 때 지정된 스크린으로 이동하지 못하는 이슈 해결이사 서비스의 첫 견적도착 시간을 3시간에서 1시간으로 줄이고, 3개 견적이 모두 차는 비율을 20%에서 74%로 높여서 고객과 파트너 경험에 기여[기술 스택]React Native, React, Next.js, Node.js, TypescriptAWS: Lamba, ECS, DynamoDB, RDS(PostgreSQL), SNS, SQS

대한민국 경기도

스마트 레이저 비염치료기인 "코라이나(KoRhina)" 디바이스와 관련된 소프트웨어 전반을 개발하고 있습니다. 앱은 React Native, 백엔드는 Typescript, Serverless, AWS 로 개발하여 운영했습니다. Frontend: react-native, react-navigation, react-native-svg-chart, react-native-ble-plx, redux, redux-persist, i18n, lottie Backend: node.js, typescript, 100% serverless on AWS

South Korea

UX 디자인, 앱 개발, 백엔드 개발, AWS 인프라 관리, 혼자 북치고 장구치고 다함. 플레이스토어와 앱스토어에서 "미세빅" 또는 "Airy"로 검색하셔서 다운로드 가능. 미세빅(Airy)은 미세먼지/대기질 현황과 예전 대기질까지도 가장 빨리 알려주는 미세먼지 날씨 앱입니다. 세계 지도에서 3개 AQI와 6개 오염원을 마음대로 선택하여 볼 수 있는 세계에서 유일한 앱. 지도 앱처럼 편하게 줌인 줌아웃 이동하시면서, 우리동네 뿐만 아니라 한국, 중국, 일본 등 동북아 동남아, 유럽, 미국 대기질 현황도 볼 수 있습니다. 특히 가장 가까운 1개 측정소가 아닌, 5~10개의 인근 측정소 대기질을 분석하여 보여줍니다. https://www.notion.so/Airy-91888b25934242a0a5d250532f4657da

Gangnam-Gu, Seoul, Korea

- Managed design and development of global e-commerce systems which enables B2C and B2B2C cross border trading from Korea to US/China, and from US/UK/Italy to Korea/China/Japan: instead of purchasing many inventories prior to sales, a B2C seller in a country requests a supplier in another country to export corresponding products directly to its customers upon receipt of orders. - Designed application architectures consisting of many independent systems, such as Magento, proprietary ERP, WMS, global B2B system, and then managed whole development processes. - Led Korean, English, Japanese, and Chinese e-commerce site building projects by using IBM WCS and Magento since 2010, now running 10 Magento sites. - Trying to spread Agile culture- Recent interested areas include Lean Startup, Agile, DevOps, Microservice Architecture, Service-based Architecture, Docker

Developed remote development agent and debugger for embedded software development tool, called ESTO.Developed TargetAgent for embedded Linux to load, run, debug embedded software at target.Developed multi-threaded remote debugging feature for gdb, which was not provided by gdb in 2001.Developed remote monitor which visualizes resources at target.Led real-time analyzer tool project which enables whether real-time software will meet its deadline or not.Researched on embedded software application areas, such as Ubiquitous Computing(Embedded Everywhere), Augmented Reality, Sensor Network, Smart Dust, Telemetics, etc.PublicationsY.H. Choi, H.T. Lim, C.D. Lim, "Schedulability Analysis for TMO-based Distributed Real-Time Embedded System", Proc. WSCERTS '04.H.T. Lim, Y.H. Choi, C.D. Lim, "Design of a Practical Timing Analyzer for Real-Time Embedded Software", IT-SoC, Oct. 2004.

Doctor Of Philosophy (Ph.D.), Real-Time Fault Tolerant Systems, Embedded Systems, Real-Time Software Engineering

Thesis: A Model and Its Run-Time Environment to Develop Highly Reliable Fault Tolerant Real-Time Systems

Master’S Degree, Real-Time Fault-Tolerant Systems

Thesis: Monitor for Highly Reliable Intelligent Vehicle System

Bachelor’S Degree, Computer Science