First of all let me try to describe a bit about the current system... We are offering a marketplace for connecting 'hosts' to 'volunteers' where
Host: As a host you offer accommodation & meals to travelers, who help you with a project in return.
Volunteers: As a volunteer you offer a helping hand in exchange for accommodation & meals.
We need an iOS app for our marketplace i.e.:
1. Common Login window for both Host and Volunteers
2. Registration process for Hosts
3. Registration process for Volunteers
4. Edit Profile both Host & Volunteer
5. List Volunteers with filters
6. Volunteer Profile page
7. List Hosts with Map and filters
8. Host Profile page
9. Contact form where Volunteer can contact Hosts
10. Message section to view old message and reply
For design: I will show the android version as reference