I have a question for a friend who is looking to work at US-based companies either remotely and is open to relocating and moving there if required, but she is from the UK and a citizen there who just left her job as a software engineer at a startup in the UK recently.

She is looking to be able to legally work for some of these US based companies and is also interested in US startups but when applying she cannot answer the US authorization question in the application (If she said 'No' it will get her an immediate rejection). So my question(s) are:

What is the best visa for her to apply for as a UK citizen to work for a US company?

How long will it take for her to get the visa so she can apply for US jobs?