Currently self-employed with a web hosting company started with some former colleagues when the company we used to work for was bought out and shut down. We were fortunate to be included in a list of alternate providers that the old company gave to their customers and had an early influx of a couple thousand customers. As a result we've got a ton of customers who we've been working with for 16+ years.

I handle the customer-facing stuff, ie service and support. That sort of work has the downside of dealing with occasional negativity, but for the most part our customers are happy and capable of producing complex problems that are fun to solve :)