Marvin Schemmelmann
Analyst at zeb consulting
Drensteinfurt, North Rhine-Westphalia, Germany
Summary
🤩
Rockstar🎓
Top SchoolMarvin Schemmelmann is an IT Analyst with six years of hands-on experience bridging consulting and engineering at zeb, currently pursuing a Master's in Business Informatics with a focus on AI at FH Münster. He blends practical client-facing IT customizing work with strong backend engineering skills—self-taught expertise in AWS, Kubernetes and Python—gained through real-world projects and open-source contributions. Notably, he has contributed performance and correctness improvements to the Apache DataFusion SQL query engine, including NDJSON handling and parquet statistics enhancements. Based in Drensteinfurt, Germany, Marvin combines analytical rigor from his Wirtschaftsinformatik studies with a pragmatist’s approach to scalable data processing and cloud-native tooling.
6 years of coding experience
Master, Wirtschaftsinformatik, Master, Wirtschaftsinformatik at FH MünsterBachelor, Wirtschaftsinformatik, Bachelor, Wirtschaftsinformatik at Hochschule WeserberglandAbitur, Chemie, Mathematik, 1,7, Abitur, Chemie, Mathematik, 1,7 at Kardinal-von-Galen Gymnasium, Münster-Hiltrup
Github Skills (10)
fusion10
query-engine10
rust10
arrow-keys10
sql10
arrows10
arrow-js10
parquet9
big-data9
testing8
Programming languages (3)
Github contributions (5)
apache/datafusion
Dec 2023 - Jun 2024
Apache DataFusion SQL Query Engine
Role in this project:
Back-end Developer
Back-end DeveloperContributions:40 reviews, 16 PRs, 91 comments in 6 months
Contributions summary:Marvin contributed to the Apache DataFusion SQL Query Engine by implementing bug fixes, adding tests, and refactoring existing code. Their work focused on improving the functionality and performance of the query engine, particularly in areas like NDJSON file reading and handling of non-null sub-fields within struct fields. They also added enhancements related to memory size estimation for the HashTable and implementing data page statistics for parquet files. These contributions indicate a focus on improving the core functionality and performance of the data processing engine.
querypythonquery-enginedataframerust
marvinlanhenke/iceberg-rust
Feb 2024 - Jun 2024
Apache Iceberg
Contributions:125 pushes, 28 branches in 3 months
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