To change culture within a team, you must change what you reward and focus on. However, you must balance this change and not over-correct in the other direction.
You can also âformâ culture by setting good examples and templates at the start. E.g. setting a repo up with tests, should encourage future developers to test. Make it easier on your peers and those that follow you to do the right thing1.
1. Fournier, C. Driving Cultural Change Through Software Choices. Medium (2020).