I notice App Engine isn&#x27;t mentioned in their stack. I&#x27;m a bit worried that Google abandons it once Snapchat moves off it. It has already been in maintenance mode for some years now (save for Managed VMs). The writing was on the wall when Guido left the team. Apparently Google still uses it internally (as the recent switch to Monorail made evident), so perhaps it&#x27;s safe for a few more years.