# Gonzalo Peña-Castellanos

> Colombian software engineer with 11+ years of experience. AI Engineer at Backblaze. Core contributor to JupyterLab, Spyder IDE, napari and conda-forge. Python · TypeScript · Go · MCP · Claude.

AI Engineer · Building next-gen developer tools on Jupyter & Open Source. Canonical site: https://goanpeca.co. Available in EN / ES; the links below are the EN versions.

## Pages
- [Home](https://goanpeca.co/en/): Gonzalo Peña-Castellanos
- [Talks & Presentations](https://goanpeca.co/en/talks/): Conference talks, webinars, and meetup presentations on Python, GitHub Actions, open source, and the Jupyter ecosystem.
- [Privacy](https://goanpeca.co/en/privacy/)
- [Projects](https://goanpeca.co/en/projects/): A selection of open source projects and professional work I've contributed to over the years.
- [About](https://goanpeca.co/en/about/)

## Blog
- [How I Use Claude Code: Meta Repos, Plan Persistence, and Iteration Logs](https://goanpeca.co/en/blog/2026/02/how-i-use-claude-code/): Practical patterns for AI-assisted development: meta repos for multi-project context, persisting plans in claude-plans/, and iteration logs for debugging hard bugs. (2026-02-19)
- [Jupyter Mimetypes for Datalayer SDK](https://goanpeca.co/en/blog/2025/08/jupyter-mimetypes-datalayer-sdk/): Announcing the jupyter-mimetypes package for simplified data exchange between Jupyter kernels using Apache Arrow serialization. (2025-08-11)
- [Open Source and Open Science in Latin America](https://goanpeca.co/en/blog/2022/09/open-source-open-science-latin-america/): Exploring language localization challenges, infrastructure barriers, and community-building initiatives for open source and open science across Latin America. (2022-09-15)
- [Why We Are Excited About JupyterLab 3.0 Dynamic Extensions!](https://goanpeca.co/en/blog/2020/10/jupyterlab-3-dynamic-extensions/): Quansight's JupyterLab developers discuss the transformative changes in version 3.0, particularly dynamic extensions powered by webpack 5 module federation. (2020-10-19)
- [Spyder 4.0 Beta 2 Release](https://goanpeca.co/en/blog/2019/08/spyder-4-beta2/): Announcing the second beta release of Spyder 4.0 with new features including an improved editor, plots pane, and enhanced debugging capabilities. (2019-08-01)
- [TDK-Micronas Partners with Quansight to Sponsor Spyder](https://goanpeca.co/en/blog/2019/06/tdk-micronas-quansight-spyder/): TDK-Micronas partners with Quansight to fund Spyder IDE development, supporting the scientific Python community through corporate sponsorship. (2019-06-01)

## Optional
- [Sitemap](https://goanpeca.co/sitemap.xml): All indexable URLs (XML)
- [RSS feed](https://goanpeca.co/en/rss.xml): Writing posts (RSS 2.0)
- [Atom feed](https://goanpeca.co/en/atom.xml): Writing posts (Atom 1.0)
- [ES version](https://goanpeca.co/es/): Same site in ES