Keynote: Scaling from One to Billions
09-21, 14:00–15:00 (Europe/Lisbon), Auditorium

This talk ties the core components of what makes a good Django/Python/whatever developer into activities that can affect billions of people. The volume of lives affected raises ethical questions, for as Ian Malcolm says, “Your scientists were so preoccupied with whether or not they could, they didn’t stop to think if they should.”


Daniel Roy Greenfeld is a senior software engineer with over 25 years professional experience. He began his Python and Django journey working with NASA. He has created/co-created/maintained open source projects such as Cookiecutter, django-crispy-forms, Cookiecutter Django, Django Packages, cached-property, and lots more. A passionate writer, most of his public works can be found at and he is a co-author of the venerable Two Scoops of Django series of books.

Daniel is husband to Audrey Roy Greenfeld, creator of the Cookiecutter project/ecosystem, co-author of Two Scoops of Django, and one of the original founders of PyLadies. Together Daniel and Audrey raised their daughter in Los Angeles, California, USA.

As a father and a human Daniel is very passionate about using his skills and talents to address climate change, hence why he works for Octopus Energy as Director of US Engineering.