Docker doesn’t replace the need to know how VMs work. Containers don’t magically allow you to scale to infinity (Although k8s shows a lot of potential). And you probably should be using PostgreSQL instead of NoSQL unless you’re absolutely sure you’re smart enough to know why PostgreSQL can’t work for your use case.

Serverless is great if you want to replace a cron job, the value of the function firing is substantially higher than the cost to run it (“margins are crazy high, optimize to VMs later and ignore the AWS bill for now”), or you’re executing untrusted code in isolation for customers.