If you are willing to have a remote team then this is not a problem - lots of great (senior) developers in EU, Asia,... No need to pay FAANG level compensations either. Curiously enough not many US companies do that, or those that do, put rounds and rounds of interviews in front of each candidate. Which is OK I guess - if you pay FAANG salaries. But if not, maybe just limit to 3 interviews, one hour each? If that's not enough to judge a potential hire then I don't know what is. Once the hiring is fixed you should have lots of great candidates available.