Grzegorz Gierlach
Senior Software Engineer at Confidential
Poland
Summary
🤩
Rockstar🎓
Top SchoolGrzegorz Gierlach is a Senior Software Engineer with over 10 years of experience building and optimizing backend systems, currently based in Poland. He has deep expertise in JVM performance tuning and Rust, and contributed to the high-profile Hazelcast project by enhancing its Jet SQL engine and improving memory management for distributed operations. A pragmatic engineer who champions testing, continuous refactoring and common-sense design, he thrives on late-night experimentation and stubbornly probes systems to understand root causes. His career spans startups and enterprise teams, delivering scalable data-processing features and eliminating elusive bugs through methodical, hands-on work.
10 years of coding experience
15 years of employment as a software developer
Master's Degree Information Technology and Econometrics, Master's Degree Information Technology and Econometrics at Krakow University of Economics
English
Github Skills (14)
javas10
hazelcast10
data-serialization10
sql10
java10
serialization10
optimization9
optimisation9
sql-query9
query-optimization9
memory-management8
big-data7
distributed-systems7
stream-processing7
Programming languages (5)
Github contributions (5)
hazelcast/hazelcast
Feb 2020 - Nov 2021
Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:299 reviews, 279 commits, 306 PRs in 1 year 9 months
Contributions summary:Grzegorz's contributions primarily focused on improving and extending the features of the Hazelcast Jet SQL engine. They addressed issues like handling license keys, removing dependencies on deprecated code, and adding support for new features. The user was actively involved in enhancing the system with job-level serializers, expanding functionality to improve memory management in operations like Distinct and Hash Join, and incorporating support for SQL.
computationstream-processingbigtablereal-timestreaming-data
gierlachg/hazelcast-jet
Feb 2020 - May 2021
Distributed stream and batch processing engine, built on top of Hazelcast.
Contributions:1014 pushes, 275 branches in 1 year 3 months
stream-processingbatchbatch-processinghazelcaststreaming
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