I think it’s useful to understand what business and professional communicators do in the “real” world. So here are a few video resources that capture days in the life of technical communicators. These may not be perfect representations of the field, but they offer a good starting point.
Meet Technical Writers at Google
A Day in the Life of a Technical Writer
What Do Technical Writers Do (Also, What is Technical Writing?)
This one isn’t comprehensive, but it’s useful to see the way technical documentation is broken down in the technology industry. I think there are many additional ways that technical communicators engage in software design, but see what you think.