SOAP / REST   these are the technologies required for the Fusion Technical Consultants.

Iam a newbie in this area : i just found following are the simple samples provided by the developers.

Expose ADB BC (EO,V) as REST  WebService

http://waslleysouza.com.br/en/2014/10/expose-adf-bc-restful-web-service/

Entity Based REST WebService

http://deepakcs.blogspot.in/2013/09/jdeveloper-12c-ejb-with-rest-webservice.htm