I have worked in multiple jobs throughout the years, and an observant person can notice that I have held multiple jobs simultaneously. This is because of the flexible time requirements of my main career at the university, which includes teaching and other activities. This flexibility has enabled me to work other jobs, particularly those with flexible time requirements as well.
As a lecturer, I believe it is important to have knowledge about the business side of things so that I can provide practical knowledge to my students. As a developer, having connections with the university is also a plus as it allows me to provide businesses I work for with new research aspects if needed, and guarantees access to the best talents of new developers for them.