Beta release of the lesson material. This release is ready to be taught by other instructors from The Carpentries community or anyone with the relevant expertise. The lesson is visible at: https://carpentries-incubator.github.io/python-intermediate-development/. This record points to the beta release in the source repository. This lesson teaches intermediate-level software development skills in a way that mimics a typical software development process in a team, starting from an existing piece of software. It continues from the material covered in the novice-level Software Carpentry lessons and follows the same pedagogical principles, as described in Best Practices for Scientific Computing and Good enough practices in scientific computing. The software project template repository used for this lesson is available at: https://github.com/carpentries-incubator/python-intermediate-inflammation. The lesson is using the official Carpentries lesson template.