Software Heritage Co-Founder & Former Debian Leader | Stefano Zacchiroli

In this episode of Tech Over Tea, host Brody Robertson interviews Stefano Zacchiroli, co-founder of Software Heritage and former Debian Project Leader. The conversation dives deep into the mission and mechanics of Software Heritage, a non-profit initiative dedicated to collecting, preserving, and sharing all publicly available software source code for future generations. Stefano explains that the archive goes beyond simple storage by preserving full version control histories—Git, Subversion, and more—creating a global, immutable record of software evolution. He emphasizes the cultural, historical, and scientific value of source code, citing examples like Apollo mission code and Quake’s inverse square root algorithm. The discussion also covers the technical and ethical challenges of archiving, including AI scraping, platform centralization risks, and the importance of integrity through the standardized SWHID identifier. Stefano highlights the project’s growth from a two-person research effort to a 20+ person team with diverse funding from public institutions and major tech companies like IBM, Microsoft, and AWS. He also touches on the broader implications of digital sovereignty, open science, and the need for research infrastructure to analyze the archive at scale. The episode concludes with a call to action for developers and enthusiasts to contribute through donations, code contributions, advocacy, or requesting specific repositories be archived. Key takeaways include: (1) Software Heritage preserves not just code, but the full development history, enabling future reconstruction and verification; (2) The SWHID standard provides cryptographic integrity guarantees, critical for scientific reproducibility and security; (3) Centralized platforms like GitHub are fragile—archiving is essential to prevent digital obsolescence; (4) The archive enables large-scale research on open source diversity, language evolution, and community dynamics; (5) Anyone can help by donating, contributing code, promoting the project, or requesting specific repositories be archived. The overall tone is optimistic and mission-driven, underscoring the importance of collective stewardship of digital heritage.