Metrika is a statistics and information agency that provides internal and external solutions to companies for better decision making. With more that 23 thousand polls executed, they have positioned themselves very well in the salvadoran market, helping advertising agencies, media and advertisers. We designed and developed a product for them called Mystery Shopper. Its goal is to aid and complement their service of mystery evaluation of commerces. The platform is composed of an administrator's portal and an android app. This app assists employees when they are taking the polls, for information input and guidance.