For most retailers, it used to be that Black Friday was the big kick-off to the holiday shopping season. In the last few years, Cyber Monday has outpaced Black Friday in sales. The reason for that is simple: When given the choice, most consumers would rather shop online at their convenience instead of dealing with long lines and in-person crowds. Today, online shopping is made even easier with access to mobile business apps. Are you considering developing an app for your company? Here are some pro tips to help you avoid costly mistakes.