Finding a great technical talent for a CTO role is really hard not mentioning assembling the rest of the team, building the culture and so on – did you consider working with a remote agile team?
We at Spark Solutions ourselves are founders of several successful startups and we definitely understand what startup projects need the most. We’ve worked with several startups from the US helping them deliver their products and continue the development after the launch (iterate, iterate, iterate!). Communication and transparency are crucial to our work.
Give as a call at we@sparksolutions.co and let’s talk 
Check out our CTO as a service offering to design your product development strategy.