Hyeonseop Lee
Iβm a software engineer with 6+ years of experience in areas including ML engineering, data engineering, and backend software engineering. I am interested in delivering real-world business value through a data-driven software system.
βοΈ Contact information
π§ hyeonseop@ls-al.me
πΒ https://www.linkedin.com/in/hyeonseop/
π¨π»βπ» Work experience
Technical Lead
Grinder, Daejeon, Korea β (Sep 2020 - Present)
Designed and developed B2C commerce platform capable of 3rd party sales.
Set up data pipelines to collect and analyze user behavior logs.
Led machine learning projects to strengthen content-based commerce.
Machine Learning Engineer
PUBG, Seoul, Korea β (Jul 2018 - Aug 2020)
Designed and developed real-time A/B testing platform for global services with 1M+ CCU.
Improved service sales by establishing real-time recommendation system using Bayesian Inference and MAB.
Data Engineer
Hyperconnect, Seoul, Korea β (Sep 2016 - Jun 2018)
Developed data pipelines that handles user behavior logs for large-scale global services.
Built a real-time push transfer pipeline and conducted experiments on push message personalization.
Software Engineering Intern
Google, Mountain View, CA, USA β (Jan 2016 - Jul 2016)
Implemented network congestion control mechanisms for data center SDN.
π Skills
π» Tech Stacks
Big data and data pipelines frameworks
Spark, Flink, BigQuery, Athena, ElasticSearch, HBase, Airflow
Containers and cloud-based infrastructures
Docker, Kubernetes, Prometheus, Helm, AWS, GCP, Terraform
Backend software engineering
Python, Golang, Java, Kotlin, Django, Spring, gRPC, OpenAPI
Collaboration
Jira, Confluence, Notion, Git flow, GitHub PR review process
π£ Languages
Korean
Native speaker
English
Upper-intermediate speaker
π Honors and Talks
Talk βλ¨Έμ λ¬λλ A/B ν μ€νΈλΆν°β (A/B Testing for Machine Learning)
Krafton Developer Conference 2019
Talk βκ·ΈμΉλ§ μ΄λ κ² νμ§ μμΌλ©΄ A/B ν μ€νΈ μμΌμ£Όμ§ μλκ±Έβ (Things had to be done for A/B Test)
Nexon Developer Conference 2019
Talk βWhen seasonality meets Bayesian: Decomposing seasonalities in Stanβ
StanCon 2019
ACM-ICPC World Finalist
ACM-ICPC World Finals 2015, 15th place (KAIST)
DEF CON CTF Final Participant
DEF CON 24 CTF (2016), 5th place (KaisHack GoN)
DEF CON 22 CTF (2014), 10th place (KAIST GoN)
π Education
Bachelor's Degree in Computer Science
KAIST School of Computing, Mar 2013 - Aug 2021