James He
Ethereum Core Dev ( Prysm Team ) at Offchain Labs
Chicago, Illinois, United States
Summary
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Rockstar🎓
Top SchoolJames He is an Ethereum core developer with four years of engineering experience, currently working on Prysm at Offchain Labs and based in Chicago. He has been contributing to Ethereum since 2021, focusing on backend systems, test automation, and key management for Prysm’s web3signer, with hands-on involvement adapting the client for Deneb and blob sidecar handling. His open-source work includes improving the ETH consensus-specs by adding and refactoring tests for deposit processing and enhancing the widely used urfave/cli library to support flag aliases with thorough test coverage. Prior to blockchain, he spent many years as a full-stack engineer at JPMorgan, bringing production-grade reliability and API design experience to consensus and client-side development. That blend of financial-industry discipline and deep protocol-level contributions makes him adept at shipping robust, auditable infrastructure for proof-of-stake Ethereum.
5 years of coding experience
9 years of employment as a software developer
Bachelor of Science - BS, Bachelor of Science - BS at Purdue University
Github Skills (17)
consensus10
electra10
apidoc10
python10
go-language10
testing10
key-management10
go-testing10
go10
api10
ethereum10
blockchain10
command-line10
yaml10
golang10
Programming languages (14)
Github contributions (5)
OffchainLabs/prysm
Dec 2021 - Jan 2023
Go implementation of Ethereum proof of stake
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 2568 reviews, 160 commits in 1 year 1 month
Contributions summary:James's contributions focused on implementing and maintaining the web3signer key management system within the Prysm project, related to Ethereum proof of stake. Their work involved adding and integrating the Electra codebase including code for handling blob sidecars, as well as incorporating features for deposit request processing, and making the necessary adjustments for supporting the Deneb fork. They primarily interacted with the internal API components to implement these additions. They also contributed to the development of HTTP API endpoints.
ethereumgo
ethereum/consensus-specs
May 2024 - Feb 2025
Ethereum Consensus Specifications
Role in this project:Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:14 reviews, 2 PRs, 16 comments in 9 months
Contributions summary:James primarily contributed to test implementations within the Ethereum Proof-of-Stake Consensus Specifications repository. They added, updated, and merged tests related to processing pending deposits within the Electra specifications. Their work included creating new tests, and refactoring existing ones. They also interacted with the core specifications' functions and logic to validate the behaviour of the deposit process.
consensusethereum
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