Christian Ullenboom
Unternehmensinhaber at tutego
Sonsbeck, North Rhine-Westphalia, Germany
Summary
👤
Senior🎓
Top SchoolChristian Ullenboom is a Java Champion, author and trainer with over two decades founding and running tutego, a German training company focused on software development and IT topics. He combines deep practical Java expertise—supported by multiple published books and e-learning courses—with a knack for translating complex concepts into teachable material. Based in Sonsbeck, he also leads Digitales Erlebnis-Center GmbH, blending hands-on product work with learning experiences. His background as a Diplom-Informatiker from Universität Paderborn underpins a methodical approach to engineering and technical history, and his career uniquely marries authorship, professional training, and entrepreneurship in the Java ecosystem.
12 years of coding experience
Diplom Informatiker, Information Technology, 1, Diplom Informatiker, Information Technology, 1 at Universität Paderborn
Stackoverflow
1,398reputation
12.4mreached
62answers
7questions
java
top-5%
Github Skills (198)
spring-data10
spring-mvc10
data-access10
plantuml10
java10
ddd10
mermaid10
spring10
java-api10
springframework10
bootsfaces9
rtf9
data-access-layer9
sql9
textual9
Programming languages (10)
Github contributions (5)
ullenboom/java-held-lectures-material
Apr 2021 - Oct 2022
Contributions:3 commits, 17 pushes, 1 branch in 1 year 6 months
ullenboom/jrtf
Oct 2013 - Oct 2019
jRTF is a simple Java API to build RTF documents and to fill RTF templates
Contributions:1 release, 56 commits, 13 PRs in 6 years
java-apirtf
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