basically where I work right now. our John sadly tried their best but the company did not hire any more engineers. he was the sole engineer for about 7 years and everything is built from the ground up by him. John came across weird issues and used a very stinky legacy language to fix those issues.

about 9 years into his career they hired Andy and Andy tried to make as much sense of John's code but it was challenging and for the next 5 or so years millions of dollars ran through an application made by 2 developers.

anyways now I'm getting paid a lot of money because John does consulting and Andy found a way better job, but I also get the "house of cards" questions a lot.

I think management thinks they can replace me as well because I came in here and things seem to be running after Andy's departure.

But if I quit or they fire me the entire company is going under as the next engineers in line will simply quit