Before you accept any offer from FANG/MANG/hot startup, *make sure* you understand the on-call expectations. Example: at Amazon, *even data scientists* do on-call. Practically all SWEs before Principal do. In AWS, first-line managers do on-call (they typically don't in Devices/Consumer). In places like Alexa, you can expect to have shitty 5-6 week on-call rotations and extra helpings for holidays. AWS at least advertises this in their job postings, other orgs (cough Alexa) do not. So buyer beware.