|Apple is searching for an "iOS Frameworks QA Engineer" who will have the chance at working on "the very first iPhone/iPad app that uses a new API/framework in the next version of iOS," notes AppleInsider. The person will have to cooperate with different engineering teams to ensure the quality of APIs and frameworks. The job listing -- quoted above -- doesn't specify what a next-generation API might contain, but offers a first hint at Apple's development of iOS 7.
The new firmware will likely make its debut at Apple's Worldwide Developers Conference, which has yet to be announced for this year but should take place in June as usual. Before the public gets its hands on iOS 7, Apple will have to seed several progressive beta releases to developers. If the code is only announced in June, that would put a public launch around September or October.