Hi, I'm Karol.
I've spent a large part of the last decade+ working in open source, mostly around JRuby and the Ruby/JVM ecosystem. My contributions span core runtime work, ActiveRecord JDBC support, OpenSSL compatibility, and Rack integration.
I'm especially interested in the edges of software systems: compatibility, upgrades, debugging production behavior, and bridging worlds so they fit together.
I like practical engineering, mature (legacy) systems and software that survives contact with reality. If that overlaps with what you're building, feel free to reach out.
If any of my work has helped you, you can buy me a coffee (machine) or two.







