Jan Kowalski
Software Engineer
Warsaw, Masovian Voivodeship, Poland
Summary
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SeniorJan Kowalski is a full-stack engineer with 13 years of experience delivering scalable, reliable software that drives revenue and cost savings. He blends hands-on coding with strategic leadership—hiring tech talent, promoting agile practices, managing technical debt, and improving code quality and test coverage across teams. In recent roles at 7N and OSO, he built reporting applications using Slack Bot API, OpenAI, Snowflake, and led architectural documentation with ADRs and C4 diagrams to capture decisions and system relationships. His work spans AWS, Kubernetes, Kafka, Terraform, and full-stack stacks (Java/JS/TS) across fintech, insurance, and real estate domains, including building end-to-end encryption for Kafka and deploying on Kubernetes and ARM clusters. Based in Warsaw, Poland, he is an Apache Kafka enthusiast and active contributor to infrastructure tooling (e.g., fabtools for Tomcat deployment automation). He also mentors colleagues and stays current with the Software Development Life Cycle to enable team growth and future-ready systems.
13 years of coding experience
Stackoverflow
182reputation
30kreached
5answers
6questions
Github Skills (17)
python10
tomcat10
fabric10
deployment-automation10
automation9
automations9
linux8
spring-data-jpa6
jaxb6
hibernate6
angularjs6
spring-data6
spring6
if-statement6
java6
Programming languages (12)
Github contributions (5)
fabtools/fabtools
Sep 2013 - Dec 2013
Tools for writing awesome Fabric files
Role in this project:
DevOps Engineer
DevOps EngineerContributions:6 commits in 2 months
Contributions summary:Jan primarily focused on developing and maintaining tools for automating the deployment and management of Tomcat servers. They implemented the installation and configuration of Tomcat from source, including setting up system service configurations. Furthermore, they were involved in creating and integrating the necessary deployment scripts and build processes for Tomcat.
fabricmcminecraftfabricfabtoolspython
johnykov/johnykov.github.io
Jun 2018 - Apr 2024
Contributions:13 pushes, 1 branch in 5 years 11 months
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