If you can somehow get in on a new product, then those. But you wouldn't be asking in that case, so the answer is none. Unless you like ops and incremental maintenance style work. In that case go nuts.
Teams that build new hypervisors or new storage engines. Some of the best work is in the trenches. Services that add a lot of features and are growing aggressively. Teams that launch new services. There’s a lot going on. And yes you have to operate services as well.
On call is terrible throughout aws
how about sagemaker
Mxnet
I have 5 AWS friends and none of them is positive about AWS. All were looking out by year 3. 3 got hired by GCP. 2 went to their customers. LOL. Speaks volumes about the burnout rate.
My a(w)s. Stop working for terrible companies!