Konstantin Knauf
Group Product Manager at The Apache Software Foundation
Darmstadt, Hesse, Germany
Summary
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RockstarKonstantin Knauf is a Group Product Manager at Confluent with 11 years of experience specializing in stream processing and distributed systems. As co-founder of Immerok (acquired by Confluent) and an Apache Flink PMC member and committer, he blends product leadership with deep hands-on expertise, including core contributions to Flink’s windowing and timer internals. He drives product decisions informed by real engineering work—optimizing watermark emission, timer coalescing, and fault recovery—while also contributing to Flink’s website and community guidance. Based in Darmstadt, Germany, he pairs startup grit with open-source stewardship and a knack for translating complex streaming primitives into reliable, production-ready features. An avid ultimate frisbee player, he brings team-oriented energy and practical resilience to cross-functional product and engineering challenges.
11 years of coding experience
Stackoverflow
911reputation
21kreached
29answers
0questions
apache-flink
top-5%
Github Skills (28)
data-stream10
apache-flink10
big-data10
flink-sql10
java10
stream10
javas10
manage10
data-streaming10
windowing10
stream-processing10
documentation10
streaming-data10
streaming10
website-admin10
Programming languages (10)
Github contributions (5)
apache/flink-web
Feb 2019 - Mar 2022
Apache Flink Website
Role in this project:
Technical Writer / Site Reliability Engineer (SRE)
Technical Writer / Site Reliability Engineer (SRE)Contributions:36 reviews, 24 commits, 18 PRs in 3 years 1 month
Contributions summary:Konstantin primarily contributed to the Apache Flink website repository. Their commits focused on rebuilding the website and updating various pages. These updates included providing advice on the Apache Log4j Zero Day vulnerability, announcing new releases, and updating quickstart guides. The user also updated community information and other website content.
flinkapachebig-datasparkapache-flink
apache/flink
Apr 2016 - Mar 2022
Apache Flink
Role in this project:Back-end Developer
Back-end DeveloperContributions:57 reviews, 47 commits, 54 PRs in 6 years
Contributions summary:Konstantin contributed to the Apache Flink project by addressing issues in the windowing and timer mechanisms of the streaming framework. They modified core Java code within the `WindowOperator` class, focusing on optimizing watermark emission and timer management. The user also made improvements to the internal handling of timers, which involved changes to timer coalescing, trigger task cleanup, and the restoration of timers after a failure. Furthermore, they enhanced the codebase through documentation improvements and bug fixes.
pythonflinkconnectorsqlapache
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