Rafał Kostrzewski
Tech Lead at HiBob
Katowice, Silesian Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolRafał Kostrzewski is a tech lead with 11 years of experience building cloud-native systems, leading teams, and solving business problems through pragmatic software craftsmanship. Based in Katowice, he has progressed from QA and junior developer roles to senior backend engineer and technical advisor positions at companies like Brainhub, Pento, and HiBob, where he now leads technical direction. He champions DevOps culture, Domain-Driven Design, and modern infrastructure, pairing architectural thinking with hands-on delivery. An active contributor to open-source tooling, he improved the Preact CLI build process and added JSON build stats—evidence of his interest in performance and developer experience. Trained in mechatronics and robotics, he brings a systems-oriented, multidisciplinary perspective to software and infrastructure challenges.
11 years of coding experience
8 years of employment as a software developer
Bachelor of Engineering - BE, Mechatronics, Robotics, and Automation Engineering, Bachelor of Engineering - BE, Mechatronics, Robotics, and Automation Engineering at The Silesian University of Technology
Github Skills (7)
preact10
javascript10
webpacker10
webpack10
cli10
pwapp9
testing8
Programming languages (5)
Github contributions (5)
preactjs/preact-cli
May 2017 - Oct 2017
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Role in this project:
Front-end Developer
Front-end DeveloperContributions:105 commits, 37 PRs, 82 pushes in 4 months
Contributions summary:Rafał primarily contributed to the Preact CLI repository by addressing issues related to the build process and command functionality. Their work involved cleaning the build directory before running the build script and correcting error handling for unknown commands. Furthermore, they enhanced the build process by implementing a feature to generate build statistics in JSON format, useful for project analysis. The user also addressed some issues related to the development server address.
reactrolluphttp2prplpreact
rkostrzewski/Ulysses
Nov 2015 - Feb 2016
Contributions:37 commits in 2 months
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