Hyun Jin Lee

Senior Data Scientist at Coupang
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Contact Information
us****@****om
(386) 825-5501
Location
Seoul, South Korea, KR
Languages
  • English Native or bilingual proficiency
  • Korean Native or bilingual proficiency
Skills

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Bio

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Credentials

  • Advanced Machine Learning with TensorFlow on Google Cloud Platform Specialization
    Coursera
    Jan, 2021
    - Nov, 2024
  • Machine Learning with TensorFlow on Google Cloud Platform Specialization
    Coursera
    Jan, 2021
    - Nov, 2024
  • Deep Learning Specialization
    Coursera
    Nov, 2020
    - Nov, 2024
  • Google Developers Machine Learning Bootcamp
    Google Developers
    Oct, 2020
    - Nov, 2024
  • Machine Learning
    Coursera
    Mar, 2018
    - Nov, 2024
  • Bayesian Statistics: From Concept to Data Analysis (with Honors)
    Coursera
    Dec, 2017
    - Nov, 2024
  • Cluster Analysis in Data Mining
    Coursera
    Dec, 2017
    - Nov, 2024
  • Text Mining and Analytics
    Coursera
    Nov, 2017
    - Nov, 2024
  • Text Retrieval and Search Engines
    Coursera
    Aug, 2017
    - Nov, 2024
  • Data Visualization
    Coursera
    May, 2017
    - Nov, 2024
  • Certified Analytics Professional (CAP)
    INFORMS
    Feb, 2021
    - Nov, 2024
  • Google Cloud Certified Professional Machine Learning Engineer
    Google Cloud - Minnesota
    Jan, 2021
    - Nov, 2024

Experience

  • Coupang
    • South Korea
    • Technology, Information and Internet
    • 700 & Above Employee
    • Senior Data Scientist
      • May 2021 - Present

      - Built the assignment & routing model for last mile delivery using CPLEX and ortools, increasing the number of delivery completed by 25% - Built the assignment & routing model for last mile delivery using CPLEX and ortools, increasing the number of delivery completed by 25%

  • Soomgo
    • South Korea
    • Technology, Information and Internet
    • 1 - 100 Employee
    • Data Scientist
      • Sep 2019 - May 2021

      - Built a dynamic pricing system for service marketplace using convex optimization (linear programming), resulting in 30% boost of revenue while retaining retention using Python - Built a recommender system using NLP(Word Embedding), clustering, and alternating least squares (ALS) matrix completion resulting in 20% increase of conversion - Pipelined the dynamic pricing model on airflow DAGs for automated price adjustment - Built a simulation model to pre-measure the impact of the change in recommender logic - Supervised the methodology used in data analysis by 3 Business Data Analysts for robust insights - Soomgo Employee of the Year in 2019 for Data-Oriented approaches Show less

  • OMNIOUS.AI
    • South Korea
    • Software Development
    • 1 - 100 Employee
    • Data Scientist
      • Apr 2017 - Aug 2019

      - Fulfilled all data analytics & data engineering duty for a ML-based firm, providing actionable insights. - Using simulation (Simpy) and regression, found the root cause of the bottleneck in the product, and provided workarounds, resulting in more than 50% improvement in speed - Modelled influence from social network data (Instagram) using network analysis and regression, for influencer valuation. Validated for production. - Improved the quality of dataset for machine learning via statistical analysis of the data reviews / adjustments in labels and providing actionable solutions, increasing the model classification accuracy by an average of 7%p. - Used linear programming to aggregate ranks using the Kenemy-Young method, increased the accuracy of aggregation by 15% compared to simple averaging. - Built a pipeline to gather and predict the short-term SNS fashion trend, from crawling to ETL , calculation and storage. Used Holt-Winters for a short-term prediction of fashion trend based on the gathered data. - Designed the data warehouse using AWS Redshift, adhering the star schema and requirements from the machine learning engineers Show less

  • 에코마케팅
    • South Korea
    • Advertising Services
    • 1 - 100 Employee
    • Performance Marketer
      • Jun 2015 - Jan 2016

      - Managed client accounts(both SA and DA) - Overall growth-hacking including but not limited to A/B testing and UI/UX design - Analyzed the data gathered and provided strategic advice - Supervised successful launch of several campaigns (ST& Co., etc.) - Managed client accounts(both SA and DA) - Overall growth-hacking including but not limited to A/B testing and UI/UX design - Analyzed the data gathered and provided strategic advice - Supervised successful launch of several campaigns (ST& Co., etc.)

Education

  • Georgia Institute of Technology
    Master of Science - MS, Analytics
    2018 - 2020
  • Udacity
    Nanodegree, Data Analyst
    2018 - 2018
  • Korea University
    Bachelor's degree, Political Science and International Relations
    2011 - 2017
  • Code States
    Advanced Software Engineering Immersive
    2017 - 2017
  • International School Bangkok
    International Baccalauriate Diploma Candidate
    2003 - 2008

Community

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