Youngwan Lim
Principal Software Engineer at Roblox
Sunnyvale, California, United States
Summary
👤
Senior🎓
Top SchoolYoungwan Lim is a Principal Software Engineer with 12 years of hands-on experience building large-scale backend and platform systems, now leading AI/ML platform efforts at Roblox in Sunnyvale. He specializes in architecting data pipelines, labeling platforms, and high-throughput distributed services—delivering systems that span from real-time streaming to model fine-tuning and RAG retrieval. His work at Roblox produced 30+ datasets, trained 15+ models, and improved search via a fine-tuned CLIP, while prior roles at Coupang, Carousell, and NAVER reflect deep expertise in A/B experimentation, messaging, and search infrastructure. He has repeatedly built critical platforms from scratch—Kafka/RabbitMQ clusters, A/B testing frameworks, exploration-mode analytics, and microservices-based search—that scale across countries and millions of users. Comfortable across Java/Scala/Go/Python and cloud ecosystems, he blends low-level performance engineering with ML-centric productization. Outside the obvious, he brings a proven knack for turning cold-start problems into production solutions (e.g., CLIP for image labeling) and accelerating experiment feedback loops from days to minutes.
12 years of coding experience
15 years of employment as a software developer
Bachelor's degree Electrical and Electronics Engineering, Bachelor's degree Electrical and Electronics Engineering at Yonsei University
Github Skills (49)
annotations10
semantic-segmentation10
java10
datasets10
database10
apache9
key-value9
image-classification9
consensus9
labeling9
label9
apache-zookeeper9
data-labeling9
text-annotation9
image-annotation9
Programming languages (2)
Github contributions (5)
youngwan657/PyPyKids
Jul 2019 - Aug 2020
Contributions:247 commits, 119 pushes, 2 branches in 1 year
youngwan657/template
Jan 2015 - Aug 2019
Contributions:1 push, 7 issues in 4 years 7 months
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