I work with a few people that are full time but only for 3 or 4 days a a week. Not sure how it works out compensation wise for them. But they take off one day a week. Example one is off Thursday everyday. One comes in Tuesday/Wednesday after lunch) Another is off Wed/Fridays. These are all senior positions people that have been with the company for awhile. Most do it (I think) because they have a new born/young children. But work wise I don’t see anything different on my side. Just take into account that feedback gets delayed an afternoon or evening. As long as you have a good project manager, Its totally a viable thing.