Krzysztof Ślusarski
Senior Software Performance Engineer at Oscilar
Warsaw, Masovian Voivodeship, Poland
Summary
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Rockstar🎓
Top SchoolKrzysztof Ślusarski is a Senior Software Performance Engineer based in Warsaw with 6 years in focused performance and backend engineering roles and over a decade of broader Java/J2EE experience. He has a track record of diagnosing and eliminating runtime bottlenecks in distributed systems, including notable performance improvements to the well-known Hazelcast real-time data platform around SQL query processing and deserialization. Currently driving performance work at Oscilar after a recent senior engineering role at mi|im, he blends deep JVM/Java expertise with practical system-level optimizations. His background includes architecture and end-to-end solution design from long tenure at Britenet, giving him both hands-on coding chops and an architect’s view of system trade-offs. Colleagues rely on him for pragmatic fixes that yield measurable throughput and latency gains rather than speculative rewrites. He holds a Master’s in Computer Science from the University of Warsaw and brings an unusual combination of production performance tuning and enterprise integration experience.
6 years of coding experience
18 years of employment as a software developer
Master Computer science, Master Computer science at University of Warsaw
Stackoverflow
11reputation
401reached
1answer
0questions
Github Skills (11)
javas10
hazelcast10
stream-processing10
distributed-systems10
performance-optimization10
sql10
java10
low-latency9
latency9
caching9
hazelcast-jet6
Programming languages (6)
Github contributions (5)
hazelcast/hazelcast
Jan 2022 - Dec 2022
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:247 reviews, 130 commits, 215 PRs in 11 months
Contributions summary:Krzysztof primarily focused on optimizing the performance of Hazelcast's core functionalities. They addressed performance bottlenecks in SQL query processing, including improvements to the SqlPage and JmxPublisher components. Additional contributions include implementing features for SQL iterator with timeout support and fixing class caching issues to improve deserialization performance. The user's work also included changes to the SQL query information in the Jet admin API.
computationstream-processingbigtablereal-timestreaming-data
krzysztofslusarski/hazelcast
Jan 2022 - Dec 2022
Open-source distributed computation and storage platform
Contributions:340 pushes, 114 branches in 11 months
computationhazelcastbig-datadistributed-computingdistributed-systems
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