Google is looking for those who are curious and collaborative visionaries. They seek out those excited about tackling technology's hardest problems. Assure the interviewer that you bring the technical chops required to succeed in this particular job. It is essential that you research the role and thoroughly consume the information provided in the company's job posting/job description. Keep your answer to the point.
"My understanding is that you seek a candidate with expert level skills in Java, C/C++, C#, Objective C, and Python who can train junior employees. I am an expert user in all three of these areas. Do you have any questions about my technical expertise?"