I dealt with a microservice style serverless backend that was spread out across roughly 50 Go-based lambdas, one per API endpoint, with a few more for SQS and Cognito triggers. Was deployed via CloudFormation. Testing locally was an absolute nightmare even with Localstack.

Made me wish for a simple VPS, an ansible script to setup nginx and fail2ban and all that shit, and a deployment pipeline that scp'd a single binary into the right place.