Kondzielski Kasper
Team Lead at SiriusXM
Warsaw, Masovian Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolKasper Kondzielski is a Team Lead and software engineer with 11 years of experience building reliable backend and full‑stack systems from Warsaw, Poland. A Scala and functional programming enthusiast, he contributes to high-profile OSS projects including the Scala 3 compiler and scala-js DOM bindings, improving compiler completions and statically-typed web APIs. He’s shipped production features like a curl converter for the popular sttp HTTP client and has modernized libraries by migrating RxBinding to RxJava 2 and streamlining Apollo Kotlin tests. Kasper combines hands-on coding with test automation and API design, and has a track record across companies from SoftwareMill to IOHK and SiriusXM. Known as a dotfiles craftsman, he pays attention to developer ergonomics and binary compatibility details that often go unnoticed.
11 years of coding experience
10 years of employment as a software developer
Bachelor's Degree The Faculty of Electronics and Information Technology, Bachelor's Degree The Faculty of Electronics and Information Technology at Warsaw University of Technology
English
Github Skills (44)
kotlin10
apim10
lib10
apidoc10
api-design10
rxjavafx10
compiler-development10
testing10
android-test10
http10
pattern-matching10
httpc10
android-development10
wpgraphql10
java10
Programming languages (28)
Github contributions (5)
softwaremill/sttp
May 2019 - Mar 2022
The Scala HTTP client you always wanted!
Role in this project:
Back-end Developer
Back-end DeveloperContributions:9 reviews, 311 commits, 46 PRs in 2 years 10 months
Contributions summary:Kondzielski contributed to the `sttp` project by developing a curl converter, introducing features to generate curl commands from HTTP requests. They implemented the conversion of different HTTP methods, headers, and bodies, specifically handling form data, plain text, and binary data. Further contributions included attaching the curl converter to the request and incorporating handling for compression with gzip and deflate. These enhancements improved the debugging capabilities of the library, providing a mechanism to easily translate HTTP requests into curl commands for testing and inspection.
guzzlefinaglehttpclientfs2zio
softwaremill/tapir
Dec 2018 - Nov 2021
Rapid development of self-documenting APIs
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 review, 219 commits, 50 PRs in 2 years 10 months
Contributions summary:Kondzielski refactored code related to Akka HTTP and HTTP4S input matchers, suggesting a focus on API development. Their commits also indicate work on tapir server-side components. This involved extracting and refactoring components related to API input matching, contributing to the overall maintainability of the project's API handling logic.
functional-programmingendpointsobservabilityhttp4ssttp
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.