There is no job description for a Technical Generalist. If I have to describe myself, then this is how I would do it. Alternatively, you'll see me as an Information Technology Generalist, from time to time. These roles are often in support of small organizations.  

My work history often has me designing technical solutions to business problems. Many times the solution involves retiring a piece of technology that is no longer fit for purpose. And sometimes it is as simple as creating a user manual for the staff who will be using the technology in their daily operations. 

On a personal level, my role is often "Guy in the Chair" for my friends and family.