Jarosław Rzeszótko
Software Engineering Team Lead at RTB House
Warsaw, Masovian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolJarosław Rzeszótko is a seasoned software engineering team lead with 17 years’ experience building and operating high-throughput, cost-efficient systems across Java, Python, Go and C. He specializes in site reliability, systems and network programming, and has driven performance and stability improvements for RTB platforms processing hundreds of Gbps and millions of requests per second. He combines hands-on debugging, JVM and OS-level tuning (including jemalloc choices) with capacity planning, monitoring design and incident response for large on-prem clusters spanning Kafka, Elasticsearch, PostgreSQL and more. A long-time open source contributor, he has submitted fixes and detailed reports to HAProxy and Jetty and brings that upstream mindset to production engineering. Based in Warsaw, he pairs deep systems programming skills with product-focused delivery and a knack for squeezing more value from existing infrastructure.
17 years of coding experience
18 years of employment as a software developer
Engineer, Computer Science, Engineer, Computer Science at Polish-Japanese Academy of Information Technology
Github Skills (200)
fastcgi10
proxy10
http-client10
cpp10
api10
html10
dependency-injection10
httpd10
http-server10
mongodb10
servlet10
aem10
guice10
ruby10
embedded10
Programming languages (13)
Github contributions (5)
jaroslawr/jupyter-notebooks
Apr 2021 - Mar 2024
Contributions:82 pushes, 3 branches in 2 years 11 months
jaroslawr/devenv
Dec 2017 - Mar 2025
Contributions:108 pushes, 1 branch in 7 years 4 months
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