[UK-AL]

Ironically I find the developers, who have stayed at company for 10 years the worst for this. They've been maintaining the same product, for similar requests for the past years. Doing the exact same thing.

Moving to different employers means you get a wider experience of different technologies.

[restalis]

There may also be a big project that takes years of development, with each completed part serving as a prerequisite for a new one. It's hard to judge one's career from a face value unless the CV explicitly states details like "X years sunk in product maintenance".