Karl Marbaise
Java Developer Consultant (Freelancer) at SoftwareEntwicklung Beratung Schulung
Würselen, North Rhine-Westphalia, Germany
Summary
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Top SchoolKarl Marbaise is a seasoned Java developer and freelance consultant with 22 years of experience in build, configuration and CI/CD engineering, currently based in Würselen, Germany. He combines deep hands-on expertise in Maven and build tooling with a strong open-source presence as a Java Champion, Apache Maven PMC member and contributor to flagship projects like apache/maven and maven-compiler-plugin. His work focuses on stabilizing builds, upgrading dependencies, improving test automation and resolving tricky JDK/version-related compilation issues—skills he has applied across banks, insurers and large enterprise platforms. As a long-time build-and-configuration manager he pairs practical operational knowledge with code-level fixes and refactors that improve developer workflows and release reliability. Notably, his contributions include concurrency fixes and enhanced test coverage for core Maven components, reflecting a knack for solving subtle integration problems that often hide in toolchains. He brings steady consulting leadership that turns fragile CI/CD systems into robust, maintainable pipelines.
21 years of coding experience
30 years of employment as a software developer
Dipl.Ing.(FH), E-Technik (Nachrichtentechnik), Dipl.Ing.(FH), E-Technik (Nachrichtentechnik) at FH Aachen University of Applied Sciences
Stackoverflow
95,078reputation
12.3mreached
2,370answers
74questions
gradle
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jar
top-1%
command-line
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tomcat
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java
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selenium
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Github Skills (55)
pomxml10
svn10
jar10
groovy10
testing10
plugin-development10
maven-plugin10
software-quality10
java10
javas10
junit10
maven-dependency-plugin10
command-line10
overriding10
maven10
Programming languages (21)
Github contributions (5)
apache/maven-enforcer
Jan 2014 - Nov 2022
Apache Maven Enforcer (Plugin)
Role in this project:
Backend Developer
Backend DeveloperContributions:2 reviews, 136 commits, 7 PRs in 9 years
Contributions summary:Karl refactored and updated unit test code within the `maven-enforcer-plugin` repository. These changes primarily involved modifying the `RequirePrerequisiteTest.java`, `RequireActiveProfileTest.java`, and `TestBannedDependencies.java` files. The commits suggest an effort to improve test coverage and address build failures related to the enforcer plugin's functionality. Further changes include adding and refactoring tests to the `TestEvaluateBeanshell.java` and fixing test problems.
maven-pluginsenforcermavenenforcer-pluginapache
apache/maven-dependency-plugin
May 2014 - Oct 2022
Apache Maven Dependency Plugin
Role in this project:Back-end Developer
Back-end DeveloperContributions:3 reviews, 88 commits, 6 PRs in 8 years 6 months
Contributions summary:Karl primarily contributed to bug fixes and documentation improvements within the Apache Maven Dependency Plugin. Their work involved addressing issues related to null pointer exceptions, RAT issues, and dependency copy behavior. They also improved documentation for includeArtifactIds and includeGroupIds. The user's contributions focused on enhancing the plugin's stability and usability.
maven-pluginmaven-pluginsmavenmaven-dependency-pluginapache
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