I would answer the question like this...

"if i am hired, I will first analyze the bugs of products before, categorize them into random errors and systematic errors. For random errors, i will develop procedures utlizing best-demonstrated practics and try to implement them asap. For systmatic errors, i will work with engineers and development group and make system changes. I will also give feedbacks to design group so they can develop best new generation products and beat our competitors. ...."