Typically, a mobile PM is hired when a mobile application startup reaches a certain size, where multiple projects or an increasingly complex product means that the founders do not have the capacity to be heads down in product related tasks or projects. This point of saturation is very much dependent on the company and its structure. A mobile PM can be involved in several areas, including deciding features, being involved in user interface decisions, planning project budgets and road-maps, some engineering, analytic, and also QA. A mobile PM can truly be a very versatile role, requiring a varied skill set.