Serverless is fantastic for event-driven workloads at arbitrary scale. There are definitely some things to learn about serverless runtimes, but beyond that there isn't much complexity aside from the large hill to climb which is understanding IAM.

Here are a lot more examples: https://github.com/serverless/examples

And if you'd rather define the infrastructure side as code vs YAML, you might want to check out Pulumi as well: https://github.com/pulumi/examples