I will interview candidate tomorrow. I don't know what to ask anymore. He has more than 10 years experience so I should be asking some system design etc. I will

I will interview candidate tomorrow. I don't know what to ask anymore. He has more than 10 years experience so I should be asking some system design etc. I will prepare the interview with llm questions and I have answers in another page. I am not sure how do I check his soft skills with this way.