Seungju Lee
Software Engineer at Freelance
New York, New York, United States
Summary
👤
Senior🎓
Top SchoolSeungju Lee is a product-driven software engineer with 11 years of experience building scalable backend systems, video infrastructure, and Web3 products from seed-stage hacks to production services. Based in New York, he has driven high-throughput systems at Twitch—building an HLS master playlist server and real-time video pipelines—and contributed to Ethereum scaling infrastructure by refactoring core admin APIs and consolidating metrics in the Optimism project. As a founding engineer and freelancer he’s shipped DeFi protocols, cross-chain account-abstraction wallets, and won multiple hackathon prizes, demonstrating both product and protocol-level impact. He blends hands-on backend and DevOps expertise with frontend and Solidity work, frequently taking projects from prototype to fundraising and launch. A former Korean military network specialist and UNIFIL network manager, he brings disciplined operational rigor to on-call and reliability work. He’s equally focused on cultural bridge-building and practical design, turning intangible ideas into tangible, user-focused products.
11 years of coding experience
6 years of employment as a software developer
Bachelor’s Degree, Computer Science and Electrical Engineering, Bachelor’s Degree, Computer Science and Electrical Engineering at Washington University in St. Louis
English, Korean, Spanish, Chinese, Japanese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (13)
rpc10
go10
opt10
back-end-development10
optim10
devops9
rollupjs8
scale8
autoscaling8
scaling8
ethereum8
dockers3
docker3
Programming languages (9)
Github contributions (5)
ethereum-optimism/optimism
Sep 2023 - Nov 2025
Optimism is Ethereum, scaled.
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:8 reviews, 2 PRs, 12 comments in 2 years 1 month
Contributions summary:Seungju primarily focused on refactoring and standardizing the admin API within the `op-service` module, indicating work on the core infrastructure and service layer. They also made changes to the `op-batcher` component, removing redundant configurations and integrating with the standardized `op-service` configurations. Furthermore, the user refactored the metrics implementation, moving RPC-related metrics to the `op-service` for consolidation. This suggests a focus on improving the architecture and maintainability of the project.
ethereumovmrollupl2-scaling
OneClickLeverage/Cream-Leverage-Contract
Sep 2021 - Sep 2021
Contributions:81 commits, 2 PRs, 2 pushes in 7 days
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