Is that 90k the "lower average"? In Ukraine? I find that very hard to believe. Even here in Czechia that would put you firmly in the top 5 %. I don't think I personally know more than 2 people who make anything like that, and one of them isn't even in IT.
Top 5% overall or top 5% of dev jobs? Former sure, latter might be not? I live in Prague, and there are definitely multiple companies that pay more than 90k to middle positions. especially if it's before taxes.
