It’s actually simple. Burlap bags. Green coffee beans. A 1300# hunk of steel with a big fire in it. Two brothers with lots of enthusiasm. So we dump the green into the rotating drum (anywhere from 5-25#), adjust the fire accordingly, and monitor it for 12-15 minutes (420-440 degrees).
When the beans have reached the desired roast level they dump into the cooling bin until they’re back to room temperature. All that’s left is to bag, seal, and ship. After that, you know what to do with ‘em.