Continental Embedded Software Engineer interview questions

I sent a e-mail with my CV and then they contacted me to a job interview with the Software Staff who asked me several questions about c programming. I really do not know what such people I treated, however it seemed to me that they were the less professional ones.They were laughing through the time that last the interview. I really hope Continental will make some to avoid this in the future.

Technical Interview, Human Resource Interview, Offer, Signature.