Big Drop Inc is a New York-based company that designs online stores for the modern marketplace. The cutting-edge e-commerce solutions by this firm include development of online shops that are optimized for smartphones and tablets. Marketing research has shown that mobile devices are used frequently to make online purchases. Therefore, Big Drop Inc adjusts its development tactics in order to adapt to the global trends in the retail world. Online stores can be successfully launched to support mobile operating systems such as Android and iOS. The programmers at Big Drop Inc lay out the framework of e-commerce websites via HTML5 and CSS3. PHP is then combined with MySQL to activate any dynamic features and databases. Cross-platform compatibility is achieved in e-commerce websites only when pages display products without any glitches in aspect ratio, image resolution and other parameters. Big Drop Inc strives to make online stores responsive to any screen size.