Janusz Majchrzak
Technical Leader at Sii Poland
Warsaw, Masovian Voivodeship, Poland
Summary
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Senior🎓
Top SchoolJanusz Majchrzak is a Technical Leader with a decade of experience building JVM- and full-stack web platforms, currently shaping architecture and teams for one of Europe’s largest e-commerce platforms from Warsaw. He combines hands-on Kotlin/Java and React development with strong domain-driven design, event-driven and microservices expertise, and practical experience across GCP, Kubernetes, Kafka and observability stacks. As a founder and consultant he’s delivered high-availability financial and e-commerce systems for major Swiss banks and enterprise clients, often owning both platform architecture and delivery. Known for fast learning and a pragmatic approach to software architecture, he pairs deep technical craft with mentorship and continuous improvement driven by constructive feedback. An enthusiast of Event Storming and CQRS/Event Sourcing, he brings a systems-thinking perspective that keeps designs durable under scale and change.
10 years of coding experience
5 years of employment as a software developer
Bachelor of Science - BS, Computer Science, Bachelor of Science - BS, Computer Science at Jagiellonian University
English, Polish
Github Skills (39)
zombie9
visual-studio9
react-router8
cpp8
cmake8
windows8
react-redux8
config-server8
spring-data7
tailwindcss7
ai7
spring-boot7
tailwind7
junit7
webflux7
Programming languages (6)
Github contributions (5)
xcodeassociated/spring-reactive-template
Aug 2023 - Mar 2026
Contributions:1 PR, 62 pushes, 5 branches in 2 years 7 months
xcodeassociated/CloudNative
Jun 2019 - Feb 2020
Cloud Native Microservice Application
Contributions:144 commits, 1 PR, 41 pushes in 8 months
cloud-nativemicroservicesconfig-serverdockerjunit
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