An intermediate-level, single-session course in research software engineering and development skills and working as part of a team (using Python as an example language). 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. The lesson is based on the Carpentries Incubator "Intermediate Research Software Development" workshop but modified independently from the developers of the original course. This session will focus on ensuring the correction of software at scale, using a testing framework and continuous integration. Participants in the session will be guided through the materials by members of the TVS-SC Software Task Force, who will serve as instructors.