Intro

Kostas and Nitay introduce Wes McKinney and his background with pandas, Arrow, Ibis, and Posit.

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Episode notes

Summary

In this episode of Tech on the Rocks, Kostas and Nitay sit down with Wes McKinney the creator of pandas and co-creator of Apache Arrow and Ibis, and long-time leader in the Python data ecosystem. Wes walks us through his journey from building pandas in 2008 to rethinking how we represent and move columnar data with Arrow, and why Arrow is fundamentally different from file formats like Parquet and ORC.

We get into the future of data file formats, DataFusion and the new generation of query engines, the rise of open data lakes (Iceberg, Delta, Hudi), and why “big metadata” is becoming just as important as big data. Wes also shares candid thoughts on open source sustainability, how companies and infrastructure projects really survive, and how AI coding agents like Claude Code are changing the day-to-day work of software engineers, especially for complex systems work.

If you care about the foundations of modern data infrastructure, or you’ve ever called import pandas as pd, this is an episode you won’t want to miss.

Chapters

00:00 Intro — Wes McKinney & his journey in the Python data ecosystem

02:15 How pandas evolved & why UX first mattered for data science

06:14 Open source sustainability, funding & the Posit model

07:31 From pandas to Datapad, Cloudera & the origins of Apache Arrow and Ibis

13:38 What is Apache Arrow? In‑memory columnar data, batches & schemas

22:23 Inside Arrow IPC — zero‑copy, Flatbuffers & cross‑language interop

24:34 Arrow vs Parquet — columnar memory format vs columnar storage format

29:28 The next generation of columnar file formats & GPU‑friendly encodings

36:03 Big metadata, table formats & the rise of Iceberg/Delta/Hudi

43:05 Rethinking data systems: from big data to DuckDB, Rust & “no JVM” stacks

54:11 DataFusion as a modular Rust query engine for modern startups