Daniel Lehrner
Software Engineer at ConsenSys, LLC
Summary
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RockstarDaniel Lehrner is a software engineer with 11 years of experience focused on Ethereum core development and backend security. He has made notable contributions to the Hyperledger Besu project—implementing features like trace_call and EIP-7702, hardening signature handling, and improving code maintainability—demonstrating both feature delivery and security stewardship in an enterprise-grade Ethereum client. Comfortable working deep in Java-based blockchain clients, he blends protocol-level understanding with practical engineering trade-offs. Colleagues can expect a developer who pays attention to correctness, dependency hygiene, and readable APIs, bringing a pragmatic approach to complex distributed systems.
10 years of coding experience
Github Skills (10)
it-security10
javas10
api10
back-end-development10
apidoc10
ethereum10
cryptography10
blockchain10
java10
security10
Programming languages (12)
Github contributions (5)
hyperledger/besu
Dec 2021 - Nov 2022
An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
Role in this project:
Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:199 reviews, 38 commits, 169 PRs in 11 months
Contributions summary:Daniel Lehrner primarily contributed to the back-end development of the Besu Ethereum client. His work included implementing and refactoring core functionalities, such as the `trace_call` API, and the implementation of EIP-7702 which added support for delegate code. Furthermore, he was responsible for ensuring the security of the system, for example, by fixing signature bounds, and managing dependencies. Additionally, he contributed to the overall maintainability of the codebase by renaming variables and methods for consistency.
besuhyperledgerlicensedethereump2p
interpunkt/sorter-bundle
Sep 2016 - Apr 2021
Contributions:9 releases, 20 pushes, 1 branch in 4 years 7 months
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