You could look for a developer or software engineer with direct experience in using React. Alternatively, you could look for IT professionals with experience in JavaScript and give them time to learn the framework. The disadvantage of this approach is the cost. Developers are in demand at the moment, so this makes them time consuming and expensive to hire.
At Tivix, we give you access to experienced React developers instantly. If you want to outsource, we offer a wealth of experience using React directly (rather than pure JavaScript or an alternative framework), for a range of projects.