Taking over an application somebody else built.
A company launched through a software development agency and was quoted a monthly use-it-or-lose-it fee to retain a standing team to manage the few expected bugs that came through as they scaled from a few early customers. We ramp up on the code, their business purpose, and product strategy, then take on break-fix responsibilities by the hour billing only what is used, and pick up the feature work to take the product and the new company on its rapid ride to success.