Once you decide to hire reactjs developers and start delving deeper into the talent pool, you must check if your chosen developer has a strong grasp on the following skills:-
Node.js & NPM
Developers who have a good hold on Node and NPM, can leverage both to optimize the entire software development process.
If you have a user-centric and conversion-generating UI in mind, then hire dedicated React developers who are pro at HTML/CSS and designing.
Redux & Hooks
React comes with a state management facility, thereby make sure that you check the knowledge on Redux before you hire React developers.
You must hire ReactJS developers who are proficient with TDD, BDD, and Unit Tests as well as their handling capability of the latest testing tools.