Junghyun Nam (남 정현)
| E-mail: | [email protected] |
| GitHub: | @cr0sh |
| LinkedIn: | 남정현 |
| Blog: | blog.cro.sh |
Last updated: 2026-04-11
Also available on https://cro.sh/me
I am a passionate developer based in Seoul, interested in engineering computer systems at scale. My domains of expertise are HFT, smart contracts and on-chain MEV. I am also open to exploring system programming related domains, for example, performance optimization in LLM inference systems.
Education
Seoul National University 2019.03 – 2025.02
Completed a Bachelor’s degree in Computer Science & Engineering.
- Cum laude
- GPA: 3.81/4.3 (95.1/100)
Sejong Science High School 2016.03 – 2019.02
Work Experience
HYPERITHM 2021.08 – 2026.05
Hyperithm is a leading digital assets manager in Asia, based in Japan and Korea.
I built the in-house HFT infrastructure, managed overall DevOps, and then I repositioned myself to be more tailored to Crypto trading. I was the principal engineer for on-chain strategies and DeFi integration.
- Head of Infrastructure (– 2023)
- Lead DeFi Engineer (– 2026)
Research Intern at CARES Lab, Seoul National University 2021.03.26 – 2021.06.30
Developed RustFTL, a Rust port of the FEMU SSD emulator.
Engineering Intern at CN.AI 2020.08.01 – 2020.08.28
Constructed data pipeline for deep audio classifier with PyO3 and HDF5 to accelerate model training speed.
Skills
- Programming languages: Rust, TypeScript, Go, Python
- Systems programming: Low latency networking, async programming
- Blockchain: Proficient in Solana and on-chain MEV trading, deep Web3/DeFi knowledge
Projects
Grasshopper Rust, LuaJIT, Tokio, Async programming, FFI
High performance runtime for LuaJIT, both accomplishing fast bootstrapping of strategy and low latency trading.
Nerf Rust, Serde, Tokio, Tower, Hyper, HTTP
An HTTP request framework with tower-rs integration, featuring mock
testing paired with Axum.
Talks
Introduction to NIZK Proofs
https://blog.cro.sh/slides/introduction-to-nizk-proofs-20220307.pdf
Rust 비동기 프로그래밍 (Asynchronous Rust Programming)
https://blog.cro.sh/slides/async-rust-programming-20220801-redistributable.pdf
Achievements
- ETHSeoul 2023 Hackathon: The Graph - Best New Subgraph
- Jane Street ETC (Electronic Trading Challenges) 2023: 2nd Place (Team ETHEREUMCLASSIC)
Languages
- Korean: Native
- English: Fluent
Acknowledgement
The favicon of this page was generated using following graphics from Twitter Twemoji:
- Graphics Title: 1f4f0.svg
- Graphics Author: Copyright 2020 Twitter, Inc and other contributors (https://github.com/twitter/twemoji)
- Graphics Source: https://github.com/twitter/twemoji/blob/master/assets/svg/1f4f0.svg
- Graphics License: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)