[caravel]

Many [most] of the companies using Airflow are small-ish scale, maybe less than a half a dozen people writing jobs that need to be scheduled. Airflow will bring clarity even to modest efforts, and will allow to scale the processes as needed.

In terms of architecture, it's pretty straightforward to setup Airflow on one box and run all the services there until you have to grow out of it and scale out to having multiple workers.