[vertigolimbo]

I have amended my comment to highlight that I've been mostly contracting.

I firmly believe you are looking at the short side of the stick. Ask yourself, what can you do for people to stay for 3-5 years? You don't need special stack or culture, just listen to individual's needs (plenty of books written on this subject).

Some places I worked at, the time just flew. I honestly wanted to stay there longer because the whole assignment was like a Swiss watch.

1-2 years is a red flag, but it's mostly a red flag of a bad company, not the employee. I base this on my experience and interviewing devs.