Fairly painless process. (Overwatch Team)
I had an initial interview meeting with the Lead VFX artist and Art director. The following week I received an art test with a two-week period for completion. After it was submitted I was given the go-ahead for additional interviews (4).
The recruiter I had was very helpful. And the interviews themselves were laid back and straightforward. My only complaint was there were a decent amount of repeated questions.
Overall great experience!