We are a marketplace for freelance developers codingninjas.co. In the beginning we've managed to do an MVP without a developer in a team. We've tested, pivoted few times and managed to get to a solution we want to scale. And some revenue...
Is it OK to stay without CTO co-founder and just to hire one?
If your product or service considers technology as a competitive advantage compared to other marketplaces , yes it is better to have a CTO who can leverage technology to build capabilities. E.g if you are buyer-seller matching is based on machine learning backed algorithms, you need to retain the tech guy. Does not mean he/she has to be a CTO. You could use equity power too.
If you business is just another market place and the your execution power is the differentiation, then you could live with a agency/freelance company