You apply online through their website I applied for the mathematics AI trainer which involved around 6 maths problem solving questions where you had to give an answer but also explain your reasoning. Then, you have spaces to write your education, experience, etc. You then submit your application. If you're successful, they will contact you, if not, they won't. It has been five days so far so I am guessing I was unsuccessful.

The interview process was complete online, it required I answer a questionnaire and write an essay. It seemed relatively easy, however I did not hear a response on the next process steps.