Robert Metzger
Principal Software Engineer I at Confluent
Saarbrücken, Saarland, Germany
Summary
🤩
Rockstar🎓
Top SchoolRobert Metzger is a Principal Software Engineer with 13 years of experience specializing in distributed stream and batch processing, currently leading Confluent's on-premises Flink offering. A co-founder and exit-team member of Ververica/Data Artisans, he is a long-standing Apache Flink committer and PMC member who has implemented core components like the Kafka connector, reusable hash join operators, and Docker packaging for Flink. He blends systems-level backend development with DevOps and technical writing—maintaining Flink’s docs and website in addition to shipping performance and memory-usage optimizations. Educated at TU Berlin and experienced at IBM Almaden, he frequently speaks at major big-data conferences and meetups across Europe, the US, and Asia. Known for turning research prototypes into production-grade infrastructure, he brings both deep open-source stewardship and startup-scale product delivery to complex streaming platforms.
13 years of coding experience
16 years of employment as a software developer
Bachelor, Applied Computer Science, Bachelor, Applied Computer Science at DHBW StuttgartMaster of Science (M.Sc.), Computer Science, Master of Science (M.Sc.), Computer Science at Technische Universität Berlin
German, English
Stackoverflow
4,492reputation
198kreached
92answers
14questions
apache-kafka
top-5%
hadoop
top-5%
apache-flink
top-1%
Github Skills (32)
algorithm10
algorithms10
docker10
apache-flink10
technical-writing10
bash10
distributed-systems10
dockers10
data-structure10
java10
cicd10
javas10
manage10
data-processing10
data-structures10
Programming languages (17)
Github contributions (5)
apache/flink-web
May 2015 - Oct 2022
Apache Flink Website
Role in this project:
Technical Writer
Technical WriterContributions:66 reviews, 115 commits, 50 PRs in 7 years 6 months
Contributions summary:Robert's contributions primarily focused on updating and publishing documentation for the Apache Flink project, specifically related to the website. The user edited the documentation of the website and the blog, and also added a new blog post. The user's work involved maintaining the accuracy and organization of the project's online resources, including the documentation and the blog.
flinkapachebig-datasparkapache-flink
apache/flink
Jun 2014 - Jan 2023
Apache Flink
Role in this project:Back-end Developer
Back-end DeveloperContributions:578 reviews, 805 commits, 756 PRs in 8 years 8 months
Contributions summary:Robert implemented and integrated a reusable hash join operator within the Apache Flink framework, as evidenced by their contributions in the provided commit messages. They focused on optimizations, such as a reopenable hash join and a new approach to measure and track memory usage during processing. Further contributions involved testing and debugging of data processing routines within the context of Apache Flink. The work demonstrates strong understanding of data processing techniques and implementation of optimizations within a distributed data processing framework.
pythonflinkconnectorsqlapache
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