I have been working as a professional in the dev space for over 25 years. I have contributed to developing the same software over a dozen times, some even at the same company. Over time the tools have changed, the people have changed and my role has changed. But the overall specs have remained very similar if not the exact same. Recently I did a job for a company where I was a consultant on a large project, they specifically sought me out for my expertise in the subject matter (having been involved in many similar projects). One of the C suites left the company near the end of the project, no reason given. This week he contacted me, he is now a C suite at another big company. They want to do the exact same project and want to hire me because of my expertise. I laughed my ass off, but am very happy with the work and he is a good guy (as far as C suites can be at least).