Jacob Kaplan-Moss, Django Co-Creator, Talks Ecosystems at Heroku's Waza

The value of a network is proportional to the square of the number of users connected to the system, according to Metcalfe’s law. Jacob Kaplan-Moss, co-creator of Django, highlights this as a value in creating communities or as he puts it, “ecosystems”. In his talk at Waza last week on building ecosystems, he went on to highlight three key principles of creating ecosystems:

  1. APIs to support extensibility
  2. Conservatism as a value
  3. Empowering the community

Whether building a platform or a framework, these key principles ring true. Check out his talk or read more on creating ecosystems below:

APIs to support extensibility

You don’t choose to become an ecosystem, but you can choose to do the groundwork. By defining APIs you enable others to build on the foundation you lay. Django core member Russ Keith-McGee summed this up quite clearly on the Django mailing list – "I’m not sure if this is appropriate, but it should be possible. If its not possible we should build the APIs to support it." This sentiment is at the core of building ecosystems.

Django succeeded at this with its apps API, and has a full directory in Django Packages to help others discover what has already been built. At Heroku we’re seeing the same phenomon with our buildpacks API resulting in numerous third-party buildpacks. By building APIs and empowering users, you solve more problems.

Conservatism as a value

There’s great value in the “move fast and break stuff” concept. However, creating explicit APIs and contracts that are stable is critical for an ecosystem to thrive longer term. For Django as a framework this means being slow moving and reliable when it comes to modifying any APIs in the core framework. For Heroku as a platform it means a dedication to erosion resistance. Jacob cleanly highlights this by pointing out that “Interoperabilty only works when the common parts don’t change.”

Empowering the community

Ecosystems create ways for the community to engage and contribute. With an ecosystem there’s even additional ways in which users can contribute and those contributions don’t have to be code. When a project first starts, it’s creator tests it and consumes it acting as developer and QA. As it gains popularity a project may attract new developers, then more users, who submit their own bug reports and issues. These newcomers contribute documentation patches, triage tickets, and recruit others to help with the project. Where once a single developer committed quietly, now a thriving ecosystem of contributors and consumers exists.

This change from product to ecosystem doesn’t happen overnight, it must be nurtured and nudged. Kaplan-Moss, a self-proclaimed “documentation nut” has done just that by cultivating a better understanding of Django through documentation and carefully working with patch and issue submitters. Jacob explains that if you document your process, you can increase transparency and understanding of the way things work. Django does this by clearly documenting how users can contribute back to Django; at Heroku we’ve done this by documenting our methodology on how apps should be built.


Building a great product isn’t enough, as Jacob points out: you’ve got to create a vibrant community and build an ecosystem. If it wasn’t for Django’s community there wouldn’t be over 3500 Python packages for Django. If it wasn’t for our community, you wouldn’t be able to deploy Go, common lisp, or GeoDjango to Heroku with just one command.

Learn more about ecosystems by listening to Jacob’s talk, check out other talks from Waza available now, or engage with the ecosystem of your choice today.

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