Update of mobile application 2

I have a mobile application for android and iOS that uses VOIP (integrated with sinch) that I am looking to update to version 2. We have a back end developer and are seeking client developers only. Please note we have version 2 designed and ready as photoshop files. We are looking for coding only. Tasks include Integrating chat functionality - using sinch api: To be included in this functionality a. Message receipt b. Message send c. Cache message d. Chat screen e. Chat summary screen Mixpanel integration - iOS only Schedule/Calendar a. Month screen b. Day Screen c. Add event d. Remove event e. Reminder f. Synchronisation with the server Reservations a. Save/Delete reservation with calendar b. Save reservation to list c. Present reservation screen Screen re-order and layout design One type of user registration - supplier Photo Background Username Interests About Experience Upload a video introducing yourself. Please note we have a server developer.