I Have worked on various types of applications on all flavours of iOS devices (iPhone 4, 4s,5,5s,6, 6+, iPad,iPad2,iPad3, iPad4, iPad Air, iPad mini) with all versions of iOS. I suggest give me a chance to find all the Bugs/Defects in your application and prove.
I would need the following documents from you :
1. Functional Specification document or requirement specification document.
2. Non Functional Specification document.
3. Mockups of the proposed application.
4. Performance benchmarks requirement details.