First of all "debugging legacy code" is a great skill to have. Anybody can find their cubs in shitty code they wrote, being able to work with and improve crapp

First of all "debugging legacy code" is a great skill to have. Anybody can find their cubs in shitty code they wrote, being able to work with and improve crappy legacy code is a rare skill IMO. I would not be shy to highlight that. Second, there is no shame in saying that you've reached a point at your company where you are not learning anything new, and you are looking for an environment that will help you grow further.