Each of the devices have radically different technical implementations and user bases, so I would try to identify advisors or companies with products and experience in those marketplaces. Try to clearify what your primary goals and objectives are in advance of pursuing professional advice and you will be able isolate what aspects of that individual platform that you will need to solve. Like others have mentioned, Odesk and this site are useful resources, additionally you can try reaching out to developers directly or join developer forums on services like steam. Some services such as Microsofts' may have non-disclosure agreements in place with working developers, so you may be required to approach them as a paying client to get the information your are seeking.