You need an outsourcing vendor to cover the needs of the whole project as they work over it from A to Z. The reasons to hire an outstaffing company are different. IT outstaffing services are specific types of remote employment. Here, in the outstaffing process, a recruited professional carries out all the tasks you need, yet officially being hired by another agency (IT outstaffing company). To put it more clearly, outsourcing refers to the development process, maintenance and support of whole project and outstaffing services provide you with hiring and maintenance of outstaffing team or individuals, for example, only web developers.