Here is an outline for designing a backend service for a URL shortener using Go and the Hexagonal Architecture, with Domain-Driven Design (DDD) principles

$ go test ./...
$ go build -o shortener .
$ ./shortener migrate -- --config CONFIGFILE.yaml
$ ./shortener run -- --config CONFIGFILE.yaml

docker:

$ docker-compose up
$ docker exec -it base sh
$ ./shortener migrate

and you are ready to go

• Postgres for saving urls
• Redis for caching and JWT
• Docker and Docker compose
• Hexagon Architecture
• DDD Principles
• Tests