Estonia and Bulgaria both have good English speaking levels, decent visa schemes, low and flat taxes, very good in the case of Estonia and maybe getting there in the case of Bulgaria government digital services, and lots of people in tech (so hiring shouldn't be a problem if you can provide good salaries).

Also, Romania, Poland have good reputation in this space but I don't have any direct experience with them.

Thank you for the reply! Do you mean the Estonia e-residency? If you got one, may I ask what your experience with it has been? I have always been thinking about it.

Poland had a dynamic startup scene for a while, and it was enegrized even more when basically the whole IT sector of Belarus had to relocate there.

One caveat is you're not going to see the level of exits that is possible in the United States, but the talent is there.

In Romania there are many expats working in Tech. Most young people speak English and the price level is pretty low while the taxes are flat.

I would also say Estonia.