Career. A second criterion could be the career opportunities that application development can lead to, i.e., being hired by a platform provider. As indicated above, open source development allows any developers to start working on the platform and possibly reach the committer level and then be hired by the company. With proprietary platforms only employees have access to the code therefore developers must first be hired. To increase their chances become recognized in the community, developers should join a young open source project [13]. Nokia and Google oer such an environment and the opportunities linked with it.