Hello
I am a software professional with more than 20 years of experience in different technologies and did dabble good amount of time with Open Source technologies that create an app similar to Whatsapp for Android platform with full programmatic control to implement some ambitious ideas for my own pet project.
Anyway, if you are further interested let me know in more detail on what is the scope of work. I will let you know if that is feasible for me and whether this estimate I quoted would be right.
Regards,
Logiculus Chief