Stefan Hölzle
Senior Software Developer at 1&1 Telecommunication SE
Worms, Rhineland-Palatinate, Germany
Summary
🤩
Rockstar🎓
Top SchoolStefan Hölzle is a senior software developer based in Worms, Germany, with 12 years of experience building and operating reliable systems across back-end, DevOps, and test infrastructure. At 1&1 Telecommunication he progressed from test system administration to senior development, focusing on production-grade tooling and automation. He contributes to notable open-source projects like apache/cassandra-ccm, where he has improved CLI usability, fixed permission and configuration issues, and added commands to streamline local Cassandra cluster management. With a background in electrical engineering and experience in model-based development and test automation from TU Darmstadt, he brings a systems-thinking approach that spans from low-level operations to higher-level software design. Colleagues describe him as someone who genuinely enjoys the work and quietly improves developer experience and operational robustness.
12 years of coding experience
Technischen Universität Darmstadt
Stackoverflow
5,226reputation
586kreached
149answers
3questions
cassandra
top-1%
Github Skills (21)
python10
cassandra10
command-line-interface10
command-line10
cassandra-database10
subprocess9
system-administration9
debug8
debugging8
devops8
testing7
cql6
datastax6
datastax-java-driver6
linux6
Programming languages (7)
Github contributions (5)
apache/cassandra-ccm
Feb 2015 - Feb 2018
A script to easily create and destroy an Apache Cassandra cluster on localhost
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:15 commits, 15 PRs, 7 comments in 3 years
Contributions summary:Stefan primarily contributed to the `ccm` tool's functionality by fixing bugs and improving the tool's interaction with Apache Cassandra nodes. Their work included addressing permission issues, resolving configuration errors, and enhancing command-line interface features. They also implemented new commands and refined existing ones, improving the usability and efficiency of the tool.
cassandralocalhostapachecassandra-clusterapache-cassandra
spodkowinski/cassandra
Mar 2015 - Jan 2022
Mirror of Apache Cassandra
Contributions:482 pushes, 475 branches, 5 tags in 6 years 10 months
cassandraapachedatabaseapache-cassandrajava
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