Lee, Jun Seok
Seoul, Korea, Republic of
Summary
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SeniorJunseok Lee is a seasoned backend developer with 11 years of experience building and operating high-throughput, scalable services for B2B SaaS and consumer platforms. He has driven backend architecture and feature delivery at scale—supporting tens of millions of MAU at ZEPETO and handling 70M monthly requests and multi-million message campaigns at Channel.io—using Java, DynamoDB, Kafka/Kinesis patterns, and AWS tooling. Comfortable leading small engineering teams, he has shipped production systems from delayed-queue pipelines to DKIM email integrations and bulk-processing APIs while also doing hands-on migrations of hundreds of millions of items with minimal downtime. Now at TikTok’s Platform team, he focuses on server architecture and platform reliability, valuing candid cross-functional communication and rapid user-feedback cycles. Outside work he documents engineering experiments and learnings on his blog and GitHub, reflecting a practical interest in reproducible, production-ready engineering rather than academic proofs.
11 years of coding experience
Github Skills (52)
python10
machine-learning10
deep-learning10
tensorflow10
neural-network10
ml9
deep-neural-networks9
gomoku8
command-line8
data-science7
othello7
ls7
pytorch7
artificial-intelligence7
script7
Programming languages (12)
Github contributions (5)
2JS/DBB
Jan 2015 - Aug 2020
Contributions:6 PRs, 6 pushes, 8 branches in 5 years 7 months
2JS/Actions
Dec 2019 - May 2024
Repository to Test & Study GitHub Actions
Contributions:2 PRs, 7 pushes, 3 branches in 4 years 5 months
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