Upwork has a system to automatically capture screenshots while a user is on the "clock". While we never request this functionality, some people enable it. I found it interesting to browse, however, I found it distracts from the ultimate goal, work product. It can also breed distrust, i.e. instead of looking at what your co-workers/team gets done, you start asking questions like, why is this person doing that. My point is, it's counterproductive.

What we found was very product was goal setting and work product review at regular intervals. I.e. once a week evaluate the code quality and velocity of work. What we found was if it's good, it's almost always good, and if it's bad, its bad from the start and doesn't really improve.