Core product will probably be alright, though there may be some trimming. Secondary stuff like internal tool teams, BIs, etc. will probably catch the brunt of it. If you're an under-performer or on a PIP and didn't get cut already I'd start looking.

Uber was already a long-term market capture play. They were losing money but grabbing the market with the hope that they'd be able to get automated cars on the road in time. That was kind of sustainable (for a while, anyway), but now they're getting even less cash and will likely have to cut back to the must-haves.

Engineering will likely be hit on the team/project-level, I suppose? If you need some amount of tech people to run your operation, it's hard to say "well, we're doing fewer rides, we can now fire 50% of tech". But they may well be cutting back the side-projects and exploratory R&D.

Why would you stagger them like that?

Layoffs have got to be terrible for morale. I'd expect you'd want to minimize the anxiety by getting all the uncertainty out of the way.