Marek Winkler
Software Developer at Timefold
Brno, Southeast, Czechia
Summary
🤩
Rockstar🎓
Top SchoolMarek Winkler is a seasoned Java EE backend developer with 14 years of experience building and hardening enterprise rule engines and integration layers, currently contributing at Timefold in Brno. He spent over a decade at Red Hat advancing quality and integration for Drools, jBPM and Kogito runtimes, combining hands-on bug fixes, serialization and persistence improvements with robust integration testing in OSGi and Spring contexts. His open-source work on prominent Apache projects like Drools shows a focus on core engine reliability—fixing edge cases in CEP, CSV/XLS decision table handling, and MariaDB support—rather than surface features. Comfortable switching between development and QA roles, Marek brings a pragmatic engineering mindset that prioritizes reproducible tests and stability in complex distributed systems. He holds a master’s in Informatics from Masaryk University and quietly favors tackling tricky interoperability and serialization bugs that others avoid.
14 years of coding experience
17 years of employment as a software developer
Master's, Informatics, Master's, Informatics at Masaryk University Faculty of Informatics
Github Skills (19)
testing10
drools10
java10
rule-engine10
javas10
osgi10
junit10
eventing10
jbpm9
serialization9
data-serialization9
karaf9
spring8
mariadb7
spring-boot7
Programming languages (10)
Github contributions (5)
kiegroup/droolsjbpm-integration
Feb 2016 - Jul 2019
Drools and jBPM integration with seam, spring, camel, ...
Role in this project:
Back-end Developer & QA Engineer
Back-end Developer & QA EngineerContributions:3 reviews, 17 commits, 10 PRs in 3 years 6 months
Contributions summary:Marek primarily focused on developing and testing integration components within the Drools and jBPM ecosystem, as evidenced by the addition of Karaf integration tests and blueprint configurations. Their contributions included implementing tests for Spring context and runtime manager functionalities within an OSGi environment, specifically targeting features like Kie-Spring and Kie-Aries-Blueprint. Further contributions involved addressing and reproducing issues related to OSGi and persistence within jBPM, confirming a focus on core system integration and stability.
spring-bootdroolsseamspringcamel
apache/incubator-kie-kogito-runtimes
Jun 2013 - Mar 2017
Kogito Runtimes - Kogito is a cloud-native business automation technology for building cloud-ready business applications.
Role in this project:Back-end Developer & QA Engineer
Back-end Developer & QA EngineerContributions:4 reviews, 22 commits, 3 comments in 3 years 9 months
Contributions summary:Marek primarily contributed to the Drools and Kogito runtime environments, focusing on enhancing the decision tables and persistence aspects of the Drools engine. The contributions include adding and testing features related to KieBase creation from CSV and XLS resources, and resolving issues in serialization processes. Further commits address rule engine functionalities, including fixing bugs and adding tests.
kogitoknativebusiness-automationrule-enginedrools
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