I managed the React team at Facebook. Neither Facebook nor my current (React-based) company require any prior React knowledge for frontend candidates, nor is it

I managed the React team at Facebook. Neither Facebook nor my current (React-based) company require any prior React knowledge for frontend candidates, nor is it a significant factor when evaluating people. If you’ve been successful with the tools you used in the past, we know you can learn whatever tools we use. I know not everyone hires like this, but in my experience it’s not rare either.