Comment by fdlaks

It's only worth it if working as a founding engineer satisfies any combination of these three things for you:

1. You are emotionally invested in the idea (you truly believe in it) 2. Your passion for whatever it is you do at the company is so high that it doesn't matter where you do it at 3. You need experience or a job

Don't do it for money, of because your friend started the company, or for any other reason