Doyun Kim

Overview

I work on fraud detection at Spindle Ops in Seoul. Built the trust & safety models now used in 6 product decisions a quarter. Most at home with graph analytics and Python. Learning to draw.

Fastest replies in the morning

Experience

1. Senior Data Scientist

   Apr 2025 - Present
   Spindle Ops · 1 yr 6 mo · Full-time · Seoul, South Korea
   • Built the trust & safety models now used in 12 product decisions a quarter.
   • Taught SQL to 112 non-analysts.
   • Caught $9 million of fraud in the first year of the new models.
2. Data Analyst

   Sep 2023 - Apr 2025
   Kakao · 1 yr 7 mo · Full-time · Seoul, South Korea
   • Taught SQL to 103 non-analysts.
   • Cut false positives on payment blocks by 24%.
3. Data Scientist

   Jan 2022 - Sep 2023
   Stripe · 1 yr 8 mo · Full-time · Seoul, South Korea
   • Wrote the metric definitions the leadership team reviews every week.
   • Replaced 94 hand-built dashboards with one metrics layer people trust.
4. Data Scientist

   Oct 2019 - Jan 2022
   HSBC · 2 yr 3 mo · Full-time · Seoul, South Korea
   • Caught $5 million of fraud in the first year of the new models.
   • Wrote the metric definitions the leadership team reviews every week.

Projects

No references yet.

Education

1. Singapore Management University

   BBM, Economics
   2015 - 2019