Hi, I’m Waldemar - a Scala & Big Data engineer from Warsaw with 15+ years of commercial experience in banking, fintech and the public sector.
This is my tech blog: software development and everything around it - tools, hardware, operating systems and the way we work.
Outside of work I’m a father and a motorcyclist ;)
Scala is the best JVM language out there, and it has been my main language for over 10 years. It runs on the JVM, in web browsers and natively. Lately I spend my open source time on Scala tooling for HOCON configuration files.
TLDR: As of 8 October 2026 I have fixed the renderer in sconfig (Scala port of HOCON): 43 PRs, 23 merged. The port and the Java original lightbend/config share their bugs, so I probe both and send the fix to both: 17 PRs upstream, 3 merged. Bugfixes get merged there, features don’t. AI agents did much of the typing; every claim was checked by running code.
Open-source PRs by kastoestoramadus, live from GitHub
This follows HOCON - the config format YAML should have been.
Same bug in both The Scala...
Met Scala - my main language ever since.
Software developer in banking, fintech and the public sector.
You can request my CV by email - it includes my phone number. You can also find me in the Scala Poland community.
Job offers are welcome. The best first message tells me about the project, the team and the tech stack.