Donghyun Seo

Overview

I lead ML infrastructure at REA Group in Seoul. Cut p99 latency on the ML platform services from 352ms to 158ms. Led the migration of 47 services to CUDA. Before that: Mastercard and Naver. I write a small newsletter about ML infrastructure.

Experience

1. Senior Engineering Manager

   Aug 2024 - Present
   REA Group · 2 yr 2 mo · Full-time · Seoul, South Korea
   • Moved 88% of ML platform traffic off a legacy monolith without a customer-facing incident.
   • Shipped a rewrite that took build times from 23 minutes to under 6.
   • Wrote the Ray service that now handles 37 million requests a day.
2. Senior ML Engineer

   Dec 2020 - Aug 2024
   Mastercard · 3 yr 8 mo · Full-time · Seoul, South Korea
   • Moved the homepage from rules to a learned ranker.
   • Replaced 37 hand-built dashboards with one metrics layer people trust.
3. ML Engineer

   May 2019 - Dec 2020
   Naver · 1 yr 7 mo · Full-time · Seoul, South Korea
   • Taught SQL to 167 non-analysts.
   • Shipped a ranking change that increased conversion 4.5%.
4. ML Engineer

   Oct 2016 - May 2019
   UOB · 2 yr 7 mo · Full-time · Seoul, South Korea
   • Shipped a ranking change that increased conversion 7.9%.

Projects

No references yet.

Education

1. INSEAD Singapore

   MBA, Business Administration
   2018 - 2020
2. National University of Singapore

   BComp, Electrical Engineering
   2011 - 2015