JacaScript is another frequently used language. It along with Python are typically what I see new grads using. More experienced interviewees tend to use Java/C#/C++. I interviewed in C# despite most of ,y interviewers not knowing it (though any dev can figure C# out well enough to evaluate algorithm correctness). I've also interviewed one person in Go ... despite me not really knowing Go. That's when it's really helpful to have written down every character during the interview for writing up the evaluation afterwards.