asmr - In this situation, I can suggest you to choose https://weelorum.com/ full-cycle mobile app development company, which is having a wide experience in any field and development. They are helping to choose a proper solution and help in development of your ideas and projects, choosing a proper analysis and software solution.

denial - Since I'm a designer myself and can design for apps, I usually don't look for a whole team, but individual developers. For example, I found a NodeJS developer here https://devico.io/hire/node, you can also search for other programming languages and related specialists there