Hannes Mühleisen
Co-Founder And CEO at DuckDB Labs
Amsterdam, North Holland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolHannes Mühleisen is a founder, professor, and senior researcher with 14 years of experience building and optimizing analytical database systems from research prototypes to production products. As Co-Founder and CEO of DuckDB Labs and a contributor to the core DuckDB project and its WebAssembly and web documentation efforts, he blends deep database internals expertise with practical engineering that improves UDFs, serialization, and type support. He has a strong open-source footprint—extending automated testing tools like SQLancer, integrating MonetDB into the tidyverse stack, and contributing data-processing tooling for public survey datasets—demonstrating an uncommon mix of research rigor and production-minded data engineering. Based in Amsterdam, he also holds academic roles including Professor of Data Engineering and Senior Researcher at CWI, and his background (PhD summa cum laude) underscores a persistent focus on reliable, high-performance analytics. Off the clock he’s a boat enthusiast, hinting at a pragmatic, hands-on approach to complex systems.
14 years of coding experience
Doctor of Philosophy - PhD, Computer Science, Summa Cum Laude, Doctor of Philosophy - PhD, Computer Science, Summa Cum Laude at Freie Universität BerlinComputer Software Engineering, Computer Software Engineering at University of StuttgartMaster of Science - MS, Computer Science, Master of Science - MS, Computer Science at Humboldt University of Berlin
Stackoverflow
2,552reputation
54kreached
107answers
1question
Github Skills (48)
javascript10
c-language10
website-development10
r10
testing10
data-manipulation10
databases10
typescript10
data-structure10
java10
javas10
dplyr10
duckdb10
sql10
typescript-types10
Programming languages (19)
Github contributions (5)
duckdb/duckdb
Jul 2018 - Jan 2023
DuckDB is an analytical in-process SQL database management system
Role in this project:
Back-end Developer
Back-end DeveloperContributions:75 releases, 194 reviews, 2421 commits in 4 years 6 months
Contributions summary:Hannes primarily contributed to the database-related functionality of the DuckDB project. Their work focused on improving the internal workings of the database and expanding the support for specific data types. The commits demonstrate expertise in the implementation and maintenance of crucial components like index construction, and serialization logic. The commits also included fixes for potential issues and performance improvements.
management-systemanalyticsduckdbmysqlembedded-database
duckdb/duckdb-web
Oct 2018 - Jan 2023
DuckDB website and documentation
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:6 reviews, 342 commits, 112 PRs in 4 years 3 months
Contributions summary:Hannes primarily contributed to the DuckDB website and documentation. Their work included implementing and updating installation instructions for various programming languages (Python, R, JavaScript, C++), adding code examples, and modifying the landing page content. They also worked on adding links to other projects utilizing DuckDB and correcting broken links throughout the website. They also contributed to fixing layout and improving the overall presentation of the documentation.
dbmsduckdbfaunadbjavascriptolap
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