Pocket Gems Software Engineer, Backend interview questions

The interviewer ask a question about strstr and ask me about previous job. The interviewer does not pay much attention to the speaker. For this position, they want a debugger. They talk about other things during interview process which is not related to interview. I think if the interviewer does not interested with interviewee job experience. He/She should inform interviewee about this and let interviewee know what they should talk about especially when the interviewee has multi-project in past.