Janusz Dziemidowicz
Chief Technology Officer at Ten Square Games
Lower Silesian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolJanusz Dziemidowicz is a seasoned technology leader and Chief Technology Officer with 15 years of experience building and operating large-scale server infrastructure for mobile free-to-play games and high-traffic social platforms. At Ten Square Games he has overseen every title’s backend and infrastructure, scaling services that support flagship games like Fishing Clash and Hunting Clash while managing cross-functional teams. Earlier work at Nasza Klasa included architecting payment backends, a high-concurrency instant messaging platform and massive photo storage—experience that forged deep expertise in Linux internals, networking and open-source tooling. He has hands-on security and cryptography interests and contributed performance and TLS/security improvements to the widely used ejabberd XMPP server. Combining low-level systems skills with product-minded leadership, he excels at turning complex, high-throughput requirements into reliable, maintainable production systems. Based in Lower Silesia, Poland, he pairs decades of ops-and-dev experience with a pragmatic focus on robustness and efficient resource use.
15 years of coding experience
7 years of employment as a software developer
Master of Science Computer Science, Master of Science Computer Science at University of Wroclaw
Polish, English
Github Skills (13)
mtls10
xmpp10
tls1210
erlang10
messaging10
tls1310
openssl10
libtls10
security10
mqttnet9
ejabberd9
mqtt9
xml8
Programming languages (9)
Github contributions (5)
processone/ejabberd
Sep 2011 - Apr 2013
Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server)
Role in this project:
Backend Developer
Backend DeveloperContributions:16 commits, 19 comments in 1 year 7 months
Contributions summary:Janusz primarily focused on improving the ejabberd XMPP server's performance and security. They addressed CPU usage issues caused by TLS, optimizing the handling of large data transfers. Further improvements included reducing the memory footprint of the XML stream state and disabling outdated and insecure ciphers and protocols in the TLS driver. The user also enabled more modern key exchange mechanisms.
xmppjabber-servermatrixstunjabber
rraptorr/oracle-java8
Mar 2013 - Jan 2020
Up-to-date Java 8 packages for Debian
Contributions:82 commits, 5 PRs, 37 pushes in 6 years 11 months
java-8java-dateup-to-datejavadebian
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