Jarosław Kończak
Senior Project Architect at Netcompany
Warsaw, Masovian Voivodeship, Poland
Summary
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Senior🎓
Top SchoolJarosław Kończak is a Senior Project Architect based in Warsaw with 13 years of experience designing and delivering enterprise web and data-driven systems. He combines a strong academic background in data modeling and computer graphics with hands-on expertise across .NET, SQL Server, WCF/WebAPI, and modern web stacks, rising through consulting roles at Netcompany to senior architecture. Known for pragmatic problem solving, he has also contributed performance-focused improvements to the widely used FlameGraph tool—adding source-line context and more robust addr2line handling to improve profiling accuracy. He balances delivery-oriented consulting with a continuous learning mindset, aiming to deepen expertise in systems architecture and performance engineering.
13 years of coding experience
9 years of employment as a software developer
Master's degree, Data Modeling/Warehousing and Database Administration, Master's degree, Data Modeling/Warehousing and Database Administration at Technical University of LodzEngineer's degree, Computer Graphics, Engineer's degree, Computer Graphics at University of Computer Sciences and Skills of Lodz
Danish, Polish, English
Github Skills (4)
perl10
debugging10
performance-analysis10
profiling10
Programming languages (5)
Github contributions (5)
brendangregg/FlameGraph
Mar 2021 - Aug 2021
Stack trace visualizer
Role in this project:
Performance Engineer
Performance EngineerContributions:5 commits, 3 PRs, 1 comment in 4 months
Contributions summary:Jarosław focused on enhancing the `flamegraph` tool's functionality and accuracy by adding features related to source code context and improving the handling of edge cases. Their work included incorporating source line information from `perf script -F+srcline` and optimizing the `--inline` option by caching `addr2line` results to improve performance. Furthermore, they addressed issues where `addr2line` returned incomplete or erroneous results, implementing fallbacks to maintain the reliability of the generated flame graphs. This involved modifying the Perl script to accommodate different input formats and improve the accuracy of function symbol resolution.
stacktrace
JPaxos/JPaxos
Nov 2012 - Jul 2021
Java library and runtime system for efficient state machine replication
Contributions:84 commits, 1 push, 1 tag in 8 years 9 months
javareplicationstate-machine
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