Discussion on question by AnonOP: Why is working on the same position for more than 15 years not a red flag?

I'm still mystified as to why on earth dedication and loyalty would be a red flag to anyone.

@LauriElias: “A smart person would get bored of maintaining a Spring app for a decade” — there are so many completely baseless prejudices wrapped up in that little statement.

So longevity and commitment are now seen as "fishy" and suspect? What a world.

You should also be explicit about your own goals and standards. Apparently, in 15 years you want to be something other than a Senior Software Developer - or you would not suspect that there's something "fishy" about your interviewer. What, exactly, are you aiming for? Senior management? CEO? Have you considered that those who are competent at software development are often not suited for management? Why do you think that software development is a good choice for the bottom of your desired career track? Or do you expect to leave the company in a few years for a big raise?