Lukasz Rozmej
.Net Ethereum Core Developer at Nethermind
Lublin, Lublin Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolLukasz Rozmej is a .NET and Ethereum Core developer with over a decade of hands-on experience building and optimizing blockchain clients and distributed systems. He currently architects and contributes to Nethermind, working on EVM, consensus (PoA/PoS), mempool, P2P, MEV and multiple Ethereum network upgrades while leading and growing a 20+ developer team. His strengths include performance and memory optimizations—lockless programming, DB layout tuning and algorithmic improvements—that directly improve node stability and throughput. A prolific backend contributor to the well-known Nethermind execution client, he focuses on transaction processing, validation and refactoring to harden production behavior. Earlier roles span technical leadership, microservices, AWS migrations and end-to-end architecture for enterprise clients, demonstrating both delivery and client-facing capabilities. Based in Lublin, Poland, he combines deep protocol-level expertise with practical team-building and mentoring skills rarely found in core blockchain implementers.
11 years of coding experience
10 years of employment as a software developer
Master's degree, Computer Science, A, Master's degree, Computer Science, A at Uniwersytet Marii Curie-Skłodowskiej w Lublinie
English, Polish
Github Skills (8)
evm10
transaction10
debug10
transactional10
solidity10
ethereum10
blockchain10
performance-optimization9
Programming languages (8)
Github contributions (5)
NethermindEth/nethermind
Aug 2019 - Jan 2023
A robust execution client for Ethereum node operators.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:4310 reviews, 1249 commits, 1782 PRs in 3 years 6 months
Contributions summary:Lukasz primarily contributed to the back-end functionality of the Nethermind execution client. They focused on refactoring code, producing bug fixes, and improving the transaction processing capabilities. Their work involved changes to core components like the transaction pool and internal validation, suggesting a focus on the client's operational stability and performance.
dotnetlinux-windowswindowsethereumblockchain
NethermindEth/Math.Gmp.Native
Mar 2021 - Jul 2022
Library that exposes to .NET (through P-Invoke and .NET types) all of the functionality of the GNU MP Library.
Contributions:3 reviews, 5 PRs, 10 pushes in 1 year 4 months
dotnetgnucsharpinvokedotnet-core
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