This is standard practice on monolithic apps. It is effectively an N-tier architecture. On Rails it is very expected that you would deploy the same codebase to two tiers (web and worker) and simply run rails s in one and sidekiq in the other.

Ditto in Django + Celery

Anyone using a more modern/lightweight alternative to Celery?

django-postgres-queue: https://github.com/gavinwahl/django-postgres-queue

procrastinate: https://github.com/procrastinate-org/procrastinate/