Maciej Zaleski
Full Stack Developer at OpenOrigins
Stony Stratford, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolMaciej Zaleski is a delivery-oriented full stack developer with over a decade of hands-on experience and more than 20 years working across the software development lifecycle, specializing in fintech and crypto systems. He designs and implements scalable, secure backends (including Rust and C#) and gas-optimized Solidity contracts, consistently prioritizing business outcomes over technology trends. His work spans production blockchain infrastructure, pricing and analytics feeds, NFT marketplaces and provably-fair crypto gaming, plus contributions to open-source projects like a JMeter WebSocket sampler and the Stratis Bitcoin full node. Comfortable operating across architecture, DevOps and low-level protocol debugging, he builds end-to-end solutions from smart contracts to CI/CD and bare-metal clusters. Based in the UK, he blends rigorous engineering—SOC-aligned data products and fault-tolerant nodes—with a knack for turning complex financial requirements into auditable, production-ready systems. An unusual strength: deep experience reconciling traditional finance instruments with on-chain primitives to deliver pragmatic, revenue-focused products.
12 years of coding experience
11 years of employment as a software developer
Information and Communication Technologies, Information and Communication Technologies at The Open UniversityBachelor of Engineering (BE) Computer Science, Bachelor of Engineering (BE) Computer Science at Open University
Stackoverflow
431reputation
138kreached
19answers
0questions
websocket
top-5%
Github Skills (28)
wallet10
jmeter10
apidoc10
bitcoin10
websocket10
bitcoins10
n10
java10
javas10
api10
websockets-client10
blockchain10
dotnet-core10
websocket-client10
csharp10
Programming languages (7)
Github contributions (5)
fshutdown/JMeter-WebSocketSampler
Jan 2014 - Aug 2021
JMeter - WebSocket Sampler
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 22 commits, 6 PRs in 7 years 8 months
Contributions summary:Maciej primarily focused on developing the core functionality of a WebSocket sampler within the JMeter framework. They implemented the WebSocketSampler class, including methods for connecting, sending messages, and receiving responses. The user also made UI changes for the WebSocket Sampler configuration panel and added settings for connection timeout. The user's contributions were essential for the initial setup and functionality of the WebSocket testing tool.
websocketsjmeterwebsocketjmeter-pluginsampler
stratisproject/StratisBitcoinFullNode
Aug 2018 - Apr 2020
Bitcoin full node in C#
Role in this project:Back-end Developer
Back-end DeveloperContributions:55 commits, 41 PRs, 39 pushes in 1 year 7 months
Contributions summary:Maciej primarily contributed to the Stratis Bitcoin full node project by implementing and modifying core functionalities. This included refactoring the use of `DateTime` calls, merging bug fixes, and updating the logging configuration. The user also added new features like UTXO statistics, and implemented API endpoints to distribute UTXOs. These changes demonstrate a strong focus on improving and extending the core features of the Bitcoin full node.
full-nodeblockchaincsharpcryptocurrencybitcoin
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