Donghwan Kim
mendong.kim@gmail.com
소개
Backend engineer with over 10 years of experience scaling early-stage startups in fintech and EdTech. Pioneered AI/LLM adoption within organizations, building production systems with OpenAI APIs including GPT Realtime API, RAG pipelines, and LLM-as-a-Judge evaluation frameworks. Proven track record as the first backend engineer at startups—built infrastructure from zero, grew engineering teams, and delivered business value through rapid prototyping.
경력
Codeit, Inc
Seoul, Korea
Software Engineer
Aug. 2021 - 현재
- Led AI initiative: architected Cayde, a voice-based interview platform using OpenAI GPT Realtime API, WebRTC, and LLM-as-a-Judge for automated candidate evaluation
- Built Guru AI chatbot with LangChain, RAG, and MongoDB Vector Search, achieving 30%+ sustained adoption among learners
- Rapidly prototyped AI features, collaborating with product team to validate use cases before deployment
- Designed subscription/payment infrastructure
- Tech: Go, Spring Webflux, Python, TypeScript, OpenAI API, LangChain, MongoDB, PostgreSQL, AWS
Mathpresso, Inc
Seoul, Korea
Backend Developer
Jun. 2020 - Jul. 2021
- Architected premium membership backend serving 10M+ MAU with 99.9% uptime
- Designed A/B testing framework enabling data-driven decisions across 50+ experiments
- Tech: Python, Django, MySQL, Redis, AWS
Classum, Inc
Seoul, Korea
Backend Engineer
Jun. 2019 - Mar. 2020
- Joined as the first backend engineer at seed-stage startup; designed and built entire backend architecture from scratch
- Led engineering team expansion, establishing development processes and CI/CD pipelines
- Tech: TypeScript, Node.js(NestJS), Firebase, AWS Lambda
Viva Republica (Toss)
Seoul, Korea
Server Developer
Apr. 2017 - Oct. 2018
- Built financial reconciliation system processing millions of daily transactions with 99.99% accuracy
- Migrated legacy PHP backoffice to Django, reducing operational overhead
- Created cash flow visualization dashboards enabling data-driven financial decisions
- Tech: Python, Django, Pandas, NumPy, MySQL
Xinics, Inc
Seoul, Korea
Software Developer
Jul. 2015 - Apr. 2017
- Developed video lecture production tool (Everlec) adopted by 10+ universities nationwide
- Tech: C#, WPF, JavaScript
학력
Korea Advanced Institute of Science and Technology (KAIST)
Daejeon, Korea
Computer Science
Feb. 2011 - Feb. 2020
B.S. in Computer Science