Dominik Kozaczko
Co-Owner, CEO at Wydawnictwo Diablaq
Bielsko-Biała Metropolitan Area Poland
Summary
🤩
Rockstar🎓
Top SchoolDominik Kozaczko is a seasoned Python backend engineer and entrepreneur with 13 years of professional experience, long rooted in Django since its early releases. He combines hands-on systems architecture and API design with leadership as Co-Owner/CEO of a publishing house and founder of technical consultancies, having led teams and mentored engineers across startups and product companies. His open-source contributions include meaningful improvements to widely used Django projects such as Djoser and Saleor, where he enhanced authentication, payment handling, and GraphQL efficiency. A former computer-science teacher at multiple levels, he brings rare pedagogy-to-production fluency—translating complex concepts into maintainable code and docs. Based in Bielsko-Biała, Poland, he pairs practical commerce and analytics experience with a persistent focus on robust backend interfaces and payment integrations.
14 years of coding experience
11 years of employment as a software developer
Post-Graduate Computer Science, Post-Graduate Computer Science at Uniwersytet WrocławskiMaster of Science (MSc) Physics, Master of Science (MSc) Physics at University of the National Education Commission, Krakow
English, German, Polish
Stackoverflow
2,099reputation
190kreached
21answers
31questions
Github Skills (21)
python10
apidoc10
back-end-development10
django10
rest-framework10
authentication10
payment-gateway10
user-authentication10
wpgraphql10
api10
wordpress-graphql10
graphql10
rest-api10
error-handling10
dataloader10
Programming languages (16)
Github contributions (5)
sunscrapers/djoser
Jun 2018 - Aug 2022
REST implementation of Django authentication system.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:4 reviews, 179 commits, 131 PRs in 4 years 3 months
Contributions summary:Dominik primarily contributed to the core functionality of the Djoser Django authentication system. Their work included adding support for Django 2.0, updating project requirements, and bumping the project version. Additionally, the user made significant contributions to the API endpoints by providing RESTful endpoints, updating the project documentation, and fixing some coverage drops. The user also worked on fixing password reset related issues.
django-authenticationrestdjoserrest-apiauthentication
saleor/saleor
Jul 2022 - Oct 2022
Saleor Core: the high performance, composable, headless commerce API.
Role in this project:Back-end Developer
Back-end DeveloperContributions:76 reviews, 33 commits, 15 PRs in 2 months
Contributions summary:Dominik contributed to improving the Saleor Core, a headless commerce API. Their work focused on enhancing the GraphQL API, specifically by adding and refining descriptions for filter inputs and fields. They also implemented data loaders for discounts and site settings, improving the efficiency of data retrieval. Furthermore, the user made changes to the authentication flow by integrating dataloaders into the JSONWebTokenBackend.
saleorpythoncommerceshopecommerce
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