Android phone conversation recorder

Hello Developers We are looking for an experienced android developer to help us with a number of projects. The ideal candidate has to show us his past work that is related to the particular skill in a job posting. You need to tell us exactly what you are to do to give us the app we are after. This is is to avoid people who earn online starting contracts rather than satisfying us. Take your time to read the description of the job below; The job is to create an app that record incoming and outgoing phone call's voice conversations in Android phone. It needs to work regardless of whether the phone is in speaker or non speaker mode. It will record not only regular phone calls but also VOIP calls like Skype or WhatsApp. Best Regards Jennifer