Maciej Żyszkiewicz
Software Engineer at Parity Technologies
Cambridge, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolMaciej Żyszkiewicz is a software engineer and researcher based in Cambridge with five years of experience building robust back-end systems and consensus protocol components for blockchain platforms. Currently on Parity Technologies’ Parachains Engineering team, he works on strengthening consensus and dispute-resolution mechanisms for Polkadot’s parallelized blockchain architecture. His background spans industry and research—from implementing API-driven tools at Goldman Sachs and large-scale data processing at Majestic to designing intelligent action systems in academic projects—bringing both product-oriented and formal modelling perspectives. Notably, he has contributed testing and QA improvements to the widely used Polkadot SDK, focusing on dispute integrity and candidate lifecycle correctness. Maciej combines a strong academic foundation in computer science and mathematics with hands-on cryptography and payment-channel interests, making him comfortable at the intersection of protocol design and practical engineering.
5 years of coding experience
2 years of employment as a software developer
Mathematics, Computer Science and Phys, Matura Exam: av. 92nd percentile, Mathematics, Computer Science and Phys, Matura Exam: av. 92nd percentile at Wroclaw University of Science and Technology High School (ALO PWr)Computer Science BSc (Hons), Computer Science, (Av. Grades: 88%), Computer Science BSc (Hons), Computer Science, (Av. Grades: 88%) at Aston University
English, Polish, German, Japanese
Github Skills (8)
unit-testing10
substrate10
polkadot-js10
rust10
polkadot10
blockchain10
testing10
cumulus8
Programming languages (5)
Github contributions (5)
paritytech/polkadot-sdk
Sep 2023 - Apr 2025
The Parity Polkadot Blockchain SDK
Role in this project:
Back-end Developer & QA Engineer
Back-end Developer & QA EngineerContributions:96 reviews, 12 PRs, 118 pushes in 1 year 7 months
Contributions summary:Maciej primarily focused on enhancing the testing infrastructure for the Polkadot SDK. They implemented unit tests for the inclusion struct, adding comprehensive checks for initialization, insertion, retrieval, and removal of candidate data. Furthermore, the user contributed to dispute mechanisms, adding a malus variant to the test suite. Their work centered on ensuring the integrity and robustness of the blockchain's dispute resolution processes.
blockchaincumuluspolkadotsubstrate
Overkillus/Paper-Football
Oct 2020 - Apr 2021
Video game implementation for pen&paper game paper football.
Contributions:9 PRs, 165 pushes, 27 branches in 5 months
gamefootballvideo-gamevideopen
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