For over a decade I've built the open-source infrastructure that data runs on — Apache Arrow, Parquet, Iceberg — with a focus on moving and storing data more efficiently.
Open Source Engineer at Hugging Face and an Apache Arrow PMC member. I'm one of the authors of Ibis, an Apache OpenDAL committer, and a regular contributor across the data ecosystem — hundreds of merged pull requests to Arrow, DataFusion, Iceberg, and more.
Some things I've built
- Apache Arrow — years of core work as a PMC member: the cross-platform CI/CD that ships packages at 100M+ downloads/month, PyArrow, and the Arrow C++ internals much of the columnar ecosystem is built on.
- Ibis — one of the authors of the portable Python dataframe library: its core, plus koerce, the pattern-matching and rewrite engine underneath it.
- marrow — a ground-up Apache Arrow implementation in Mojo.
- Parquet Content-Defined Chunking — a technique I designed and shipped: placing Parquet page boundaries by content instead of byte offset, so a barely-changed file re-uploads only the chunks that moved. It landed in PyArrow and pandas and powers Xet content-addressable storage, cutting data transfer by 90%+ in common rewrite patterns. → writeup
Across the ecosystem · Arrow · arrow-rs · DataFusion · iceberg-rust · OpenDAL · Ibis · xet-core
Elsewhere · kszucs.dev · LinkedIn · X @kszucs_