Marek Moraczyński
Head Of Blockchain Engineering at Nethermind
Warsaw, Masovian Voivodeship, Poland
Summary
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Rockstar🎓
Top SchoolMarek Moraczyński is a Head of Blockchain Engineering with 11 years of software development experience, leading teams at Nethermind after progressing from Engineering Lead. He combines deep .NET expertise with a strong interest in machine learning and high-performance systems, and has applied this across banking, logistics, and e-commerce domains. Marek is an active back-end contributor to the widely used Nethermind Ethereum client, where he refactored key management, improved memory safety, and added robust tests—demonstrating hands-on impact on mission-critical blockchain infrastructure. Trained at the Warsaw University of Technology, he brings a pragmatic blend of legacy-system modernization and cloud-era engineering practices to deliver scalable, secure solutions.
11 years of coding experience
11 years of employment as a software developer
Master of Science (M.Sc.) Computer Science, Master of Science (M.Sc.) Computer Science at Warsaw University of Technology
English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (7)
unit-testing10
nunit10
csharp10
keystore10
dotnet-core10
evm8
blockchain7
Programming languages (9)
Github contributions (5)
NethermindEth/nethermind
Oct 2020 - Jan 2023
A robust execution client for Ethereum node operators.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 1519 reviews, 1190 commits in 2 years 3 months
Contributions summary:Marek primarily focused on refactoring the node key manager and account unlocker, adding a password provider and associated tests. They were involved in building tests for block author accounts, fixing build-related issues, and adding legal statements to new files. Additionally, the user optimized code by removing passwords from file and ensuring proper memory management.
dotnetlinux-windowswindowsethereumblockchain
CryptoUnchained/nethermind
Oct 2020 - Jul 2022
Our flagship .NET Core Ethereum client for Linux, Windows, MacOs - full and actively developed.
Contributions:430 commits in 1 year 9 months
linux-windowswindowsethereumblockchainethereum-client
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