Sönke Liebau
Co-Founder & CPO At Stackable at OpenCore GmbH & Co. KG
Frankfurt, Hesse, Germany
Summary
👤
Senior🎓
Top SchoolSönke Liebau is a founder and product leader with 11 years of software engineering experience, currently serving as Co-Founder & CPO at Stackable and co-founding OpenCore GmbH. He blends product strategy with hands-on backend work, demonstrated by meaningful contributions to high-profile open-source projects like krustlet (Kubernetes Kubelet in Rust) and Apache Kafka, where he improved robustness, security, and logging capabilities. With a Diplom in Wirtschaftsinformatik and a background in consulting and business analysis, he excels at translating complex distributed-systems requirements into maintainable, production-ready solutions. Colleagues know him for pragmatic refactors that remove fragile dependencies and for shipping subtle but impactful tooling improvements that surface only under real-world scale.
11 years of coding experience
University of WaikatoDiplom Wirtschaftsinformatiker, Diplom Wirtschaftsinformatiker at Fachhochschule Wedel
Stackoverflow
1,953reputation
102kreached
47answers
0questions
apache-kafka
top-1%
Github Skills (26)
unit-testing10
kubernetes10
kafka10
java10
javas10
kubernetes-pods10
kubelet10
apache-kafka10
rust10
async9
asynchronous9
scala9
logging9
rest-api8
api-rest8
Programming languages (21)
Github contributions (5)
apache/kafka
Mar 2017 - Apr 2020
Mirror of Apache Kafka
Role in this project:
Back-end Developer
Back-end DeveloperContributions:24 commits, 29 PRs, 167 comments in 3 years 2 months
Contributions summary:Sönke primarily contributed to the back-end of the Apache Kafka project, focusing on improvements and bug fixes related to core components. Their work involved modifying the ConsoleConsumer tool to correctly handle offset resets and adding unit tests to the ClusterConnectionStates class. The user also addressed issues related to connector configuration in the REST API, and implemented minor improvements to the broker configuration, demonstrating proficiency in the core Kafka codebase. Furthermore, the user addressed some of the documentations issues by providing updates to the documentation.
apache-kafkakafka-consumerapachescalakafka
krustlet/krustlet
Apr 2021 - Jul 2021
Kubernetes Rust Kubelet
Role in this project:Backend Engineer
Backend EngineerContributions:10 reviews, 13 commits, 7 PRs in 3 months
Contributions summary:Sönke primarily focused on refactoring and improving the codebase's robustness and maintainability. They removed dependencies on unmaintained libraries like `tempdir` and replaced them with `tempfile`, addressing security vulnerabilities and improving code quality. Additionally, the user added features for custom shutdown behavior and implemented various parameters for logging such as 'since', 'since_seconds', 'previous', 'timestamps', and 'limit_bytes', thereby enhancing the logging capabilities. The changes involved core functionality improvements within the Kubernetes Kubelet implementation.
wasmrustwascckubeletkubernetes
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