Krzysztof Sierszeń
Software Engineer at Epassi
Łódź, Łódzkie Voivodship, Poland
Summary
👤
Senior🎓
Top SchoolKrzysztof Sierszeń is a seasoned full-stack software engineer with 10 years of experience building reliable, maintainable systems across Java, Node.js, React and mobile stacks. He has delivered domain-critical projects from healthcare and transplant-registration systems to e-commerce and insurance platforms, often working with Spring, Kubernetes, PostgreSQL and cloud integrations. Known for software craftsmanship and strong team co-ownership, he pairs pragmatic engineering with a perfectionist attention to quality and performance tuning (including algorithm optimization for HLA matching). He contributes to the developer community via StackOverflow and occasional open-source patches, and brings a global perspective shaped by studies and work across multiple countries. Outside work he channels curiosity into travel and speculative fiction, which he credits for creative problem-solving and empathy in cross-cultural teams.
10 years of coding experience
9 years of employment as a software developer
Engineer's degree, Information Technology, Engineer's degree, Information Technology at Politechnika ŁódzkaComputer Science, Computer Science at Cairo UniversityComputer Engineering, Computer Engineering at Universidad de Las Palmas de Gran Canaria
English, Spanish, Polish, arabski
Github Skills (195)
db210
guice10
maven10
database-management10
assert10
spotbugs10
continuous-testing10
architecture10
continuous-delivery10
liquibase10
maven-mojo10
sql10
dependency-injection10
database10
database-migrations10
Programming languages (10)
Github contributions (5)
crizzis/ArchUnit
Feb 2022 - Jun 2022
A Java architecture test library, to specify and assert architecture rules in plain Java
Contributions:7 reviews, 2 PRs, 28 pushes in 4 months
tddtestingspecifyassertplain
crizzis/codenarc-maven-plugin
May 2020 - May 2020
A Maven Plugin that reports on Groovy source code analysis generated by CodeNarc
Contributions:2 commits, 3 pushes, 2 branches in 1 day
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