Many years ago, I interviewed at a company that manufactured equipment used by fabs. My impression was of a very stressful environment. Their latest equipment

Many years ago, I interviewed at a company that manufactured equipment used by fabs. My impression was of a very stressful environment. Their latest equipment had some issues that were only showing up on production lines, so they wanted engineers to babysit the equipment at the fabs, and write patches on the spot for any issues observed. They repeatedly stressed how much money their customers lost for any downtime, and how there must not be downtime.