I interviewed on 2021 March for the ninja profile . I had applied for NQT Exam and i received the interview call post the exam . It was via a teams call . We had to keep the video camera on and the interviewer will take a photograph with your government id card . The interview lasted 10-15 mins in my case. For some it can go beyond 30 mins . Depends on the interviewer . Easy basic Java and python questions as I said I knew these languages.