Paweł Chrząszcz
Software Architect at Erlang Solutions
Cracow Metropolitan Area Poland
Summary
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Rockstar🎓
Top SchoolPaweł Chrząszcz is a Software Architect with 13 years of experience building scalable, fault-tolerant back-end systems, currently leading MongooseIM development at Erlang Solutions. He combines deep Erlang/XMPP expertise with an academic background—pursuing a PhD in Computer Science—and a history of hands-on contributions to core modules like mod_roster and mod_offline. Paweł has advanced large-scale messaging infrastructure, resolving tricky domain, contact management, and session consistency issues that matter in clustered deployments. Based in the Cracow area, he blends research rigor from Jagiellonian University with practical engineering delivered at Erlang Solutions and earlier roles at Klarna. Colleagues know him for shipping robust server features and improving APIs that operate in high-availability, enterprise environments.
13 years of coding experience
12 years of employment as a software developer
Master of Science (MSc), Computer Science, Excellent, Master of Science (MSc), Computer Science, Excellent at AGH University of Science and Technology in CracowAGH University
English
Github Skills (8)
xmpp10
erlang10
backend10
back-end-development10
distributed-systems9
mnesia9
rdbms8
database-design8
Programming languages (7)
Github contributions (5)
esl/MongooseIM
May 2013 - Jan 2023
MongooseIM is Erlang Solutions' robust, scalable and efficient XMPP server, aimed at large installations. Specifically designed for enterprise purposes, it is fault-tolerant and can utilise the resources of multiple clustered machines.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 1631 reviews, 1630 commits in 9 years 10 months
Contributions summary:Paweł primarily focused on the back-end development of the MongooseIM XMPP server, specifically by implementing and refining features within the mod_roster and mod_offline modules. Their work involved enhancing specifications, integrating host types, and resolving issues related to the handling of domain names, contact management, and user session activity. These contributions included bug fixes and improvements to API functions, demonstrating their engagement in enhancing the core functionality of the server.
fault-tolerantscalablexmpp-servererlangxmpp
esl/graphql-erlang
Jun 2022 - Dec 2024
Contributions:7 reviews, 4 PRs, 4 pushes in 2 years 6 months
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