Raimund Klein
Java Software Engineer at CECG
England, United Kingdom
Summary
👤
Senior🎓
Top SchoolRaimund Klein is a principal-level Java software engineer and hands-on architect with 20+ years of experience building cloud-native, high-availability platforms across FinTech, enterprise systems and consumer-facing digital products. He combines deep expertise in distributed systems, Java/Kotlin microservices, Kafka and AWS/Azure with a track record of leading teams through cloud transformations, platform modernization and rapid product launches. Known for raising engineering standards pragmatically, he balances long-term architectural vision with day-to-day delivery and mentoring, having moved organisations from supplier dependencies to in-house capabilities. His open-source contributions to projects like GreenMail show a focus on robust backend storage strategies and practical improvements to server reliability. Based in England, he is open to principal/staff engineering and lead architect roles where scalable platform engineering and operational excellence intersect. He recently augmented his leadership toolkit with executive CTO education at Imperial College, signaling a blend of technical depth and senior stakeholder fluency.
14 years of coding experience
12 years of employment as a software developer
Executive Education - Emerging Chief Technology Officer, Executive Education - Emerging Chief Technology Officer at Imperial College LondonDiplom, Informatik, Diplom, Informatik at University of BremenPelham High SchoolComputer Science, Computer Science at Humboldt-Universität zu BerlinAbitur, Abitur at Domgymnasium Verden
English, German, Spanish
Stackoverflow
3,150reputation
437kreached
108answers
4questions
java
top-5%
Github Skills (19)
imap10
smtp10
smtps10
data-structure10
java10
javas10
smtpd10
data-structures10
mock-server9
integration-testing9
mapstruct6
maven6
generics6
eclipse6
private-methods6
Programming languages (11)
Github contributions (5)
greenmail-mail-test/greenmail
May 2015 - May 2015
Official master for the Greenmail project
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 commits, 2 PRs, 12 comments in 13 days
Contributions summary:Raimund primarily contributed to the back-end aspects of the Greenmail project, focusing on enhancements to the core functionality. They developed a utility class for managing message eviction using a `MaxSizeLinkedHashMap`. Further contributions included extracting an interface `StoredMessageCollection` and implementing `ListBasedStoredMessageCollection` and `MapBasedStoredMessageCollection` to support different storage strategies and features like automatic purging. These changes suggest a focus on improving the message handling and storage capabilities of the mail server.
smtppop3emailmastergreenmail
Chessray/silver-bars
May 2019 - Mar 2025
Solution to an interview exercise called Silver Bars Marketplace.
Contributions:20 PRs, 36 pushes, 1 branch in 5 years 10 months
assertjcirclecigradle-javajava-8java8
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