Monorepos -- you've heard the talks, you've read the blog posts, maybe you've seen a few tantalizing glimpses into how Google or Meta organize their massive codebases. But it's often in the abstract and behind closed doors. What if you could crack open a real, production monorepo, one with over a million lines of Python and over 100 of sub-packages, and actually see how it's built, step by step, using modern tools and standards? That's exactly what Apache Airflow gives us. 
 

 
On this episode, I sit down with Jarek Potiuk and Amogh Desai, two of Airflow's top contributors, to go inside one of the largest open-source Python monorepos in the world and learn how they manage it with uv, pyproject.toml, and the latest packaging standards, so you can apply those same patterns to your own projects. 
 
Episode sponsors 
 
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<a href='https://talkpython.fm/training'>Talk Python Courses</a> 
 
<h2 class="links-heading mb-4">Links from the show</h2>
<div>Guests 
Amogh Desai: <a href="https://github.com/amoghrajesh?featured_on=talkpython" target="_blank" >github.com</a> 
Jarek's GitHub: <a href="https://github.com/potiuk?featured_on=talkpython" target="_blank" >github.com</a> 
 
definition of a monorepo: <a href="https://monorepo.tools?featured_on=talkpython" target="_blank" >monorepo.tools</a> 
airflow: <a href="https://airflow.apache.org?featured_on=talkpython" target="_blank" >airflow.apache.org</a> 
Activity: <a href="https://github.com/apache/airflow/pulse?featured_on=talkpython" target="_blank" >github.com</a> 
OpenAI: <a href="https://airflowsummit.org/sessions/2025/airflow-openai/?featured_on=talkpython" target="_blank" >airflowsummit.org</a> 
Part 1. Pains of big modular Python projects: <a href="https://medium.com/apache-airflow/modern-python-monorepo-for-apache-airflow-part-1-1fe84863e1e1?featured_on=talkpython" target="_blank" >medium.com</a> 
Part 2. Modern Python packaging standards and tools for monorepos: <a href="https://medium.com/apache-airflow/modern-python-monorepo-for-apache-airflow-part-2-9b53e21bcefc?featured_on=talkpython" target="_blank" >medium.com</a> 
Part 3. Monorepo on steroids - modular prek hooks: <a href="https://medium.com/apache-airflow/modern-python-monorepo-for-apache-airflow-part-3-77373d7c45a6?featured_on=talkpython" target="_blank" >medium.com</a> 
Part 4. Shared “static” libraries in Airflow monorepo: <a href="https://medium.com/apache-airflow/modern-python-monorepo-for-apache-airflow-part-4-c9d9393a696a?featured_on=talkpython" target="_blank" >medium.com</a> 
PEP-440: <a href="https://peps.python.org/pep-0440/?featured_on=talkpython" target="_blank" >peps.python.org</a> 
PEP-517: <a href="https://peps.python.org/pep-0517/?featured_on=talkpython" target="_blank" >peps.python.org</a> 
PEP-518: <a href="https://peps.python.org/pep-0518/?featured_on=talkpython" target="_blank" >peps.python.org</a> 
PEP-566: <a href="https://peps.python.org/pep-0566/?featured_on=talkpython" target="_blank" >peps.python.org</a> 
PEP-561: <a href="https://peps.python.org/pep-0561/?featured_on=talkpython" target="_blank" >peps.python.org</a> 
PEP-660: <a href="https://peps.python.org/pep-0660/?featured_on=talkpython" target="_blank" >peps.python.org</a> 
PEP-621: <a href="https://peps.python.org/pep-0621/?featured_on=talkpython" target="_blank" >peps.python.org</a> 
PEP-685: <a href="https://peps.python.org/pep-0685/?featured_on=talkpython" target="_blank" >peps.python.org</a> 
PEP-723: <a href="https://peps.python.org/pep-0732/?featured_on=talkpython" target="_blank" >peps.python.org</a> 
PEP-735: <a href="https://peps.python.org/pep-0735/?featured_on=talkpython" target="_blank" >peps.python.org</a> 
uv: <a href="https://docs.astral.sh/uv/?featured_on=talkpython" target="_blank" >docs.astral.sh</a> 
uv workspaces: <a href="https://blobs.talkpython.fm/airflow-workspaces.png?cache_id=294f57" target="_blank" >blobs.talkpython.fm</a> 
prek.j178.dev: <a href="https://prek.j178.dev?featured_on=talkpython" target="_blank" >prek.j178.dev</a> 
your presentation at FOSDEM26: <a href="https://fosdem.org/2026/schedule/event/WE7NHM-modern-python-monorepo-apache-airflow/?featured_on=talkpython" target="_blank" >fosdem.org</a> 
Tallyman: <a href="https://github.com/mikeckennedy/tallyman?featured_on=talkpython" target="_blank" >github.com</a> 
 
Watch this episode on YouTube: <a href="https://www.youtube.com/watch?v=SKd78ImNgEo" target="_blank" >youtube.com</a> 
Episode #540 deep-dive: <a href="https://talkpython.fm/episodes/show/540/modern-python-monorepo-with-uv-and-prek#takeaways-anchor" target="_blank" >talkpython.fm/540</a> 
Episode transcripts: <a href="https://talkpython.fm/episodes/transcript/540/modern-python-monorepo-with-uv-and-prek" target="_blank" >talkpython.fm</a> 
 
Theme Song: Developer Rap 
🥁 Served in a Flask 🎸: <a href="https://talkpython.fm/flasksong" target="_blank" >talkpython.fm/flasksong</a> 
 
---== Don't be a stranger ==--- 
YouTube: <a href="https://talkpython.fm/youtube" target="_blank" > youtube.com/@talkpython</a> 
 
Bluesky: <a href="https://bsky.app/profile/talkpython.fm" target="_blank" >@talkpython.fm</a> 
Mastodon: <a href="https://fosstodon.org/web/@talkpython" target="_blank" > @talkpython@fosstodon.org</a> 
X.com: <a href="https://x.com/talkpython" target="_blank" > @talkpython</a> 
 
Michael on Bluesky: <a href="https://bsky.app/profile/mkennedy.codes?featured_on=talkpython" target="_blank" >@mkennedy.codes</a> 
Michael on Mastodon: <a href="https://fosstodon.org/web/@mkennedy" target="_blank" > @mkennedy@fosstodon.org</a> 
Michael on X.com: <a href="https://x.com/mkennedy?featured_on=talkpython" target="_blank" > @mkennedy</a> </div>

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