Netherlands is best for money I hear, especially for the tax cut you get the first 5 years.

I live in Estonia and it has a nice startup culture, chill atmosphere, and just a great place to live, but salary is peanuts compared to NL unless you work for Wise, Bolt, or one of the 134234234 online casino providers. CoL is of course much lower than western Europe, but still much higher than it should be at the salary level here. But software engineers easily make 2-3x median salary, with 5-7x median salary not out of the realm of possibility at high-end positions in high-end companies. So you won't be strapped for cash if you're good.