I am looking for an experienced developer who knows the WhatsApp, Line and WeChat social IM and API. He/she must be able to develop the app in accordance with the requirements.
1. Send a message to all\some contacts at once. (send 2,000 - 10,000 contacts maximum for single message); should not take more than 30mins to send out the message.
2. Can group contacts easily
3. Ability to change sender number easily due to the limitation of messages can be sent out each day
4. Have the feature to import and send a large amount (up to a million phone numbers) of contacts.
5. Have the feature to check and filter the imported contacts on which of the numbers are registered with Whatsapp, WeChat and Line. It also must be able to filter out numbers who are in Whatsapp's Blacklist so as any messages will not be sent to them.
6. Have the feature to extract reports from the recipients if they have read the message that was being sent to them.
7. Have the feature to export the outgoing report
8. Have the feature to include an Unsubscribe link to enable recipients to unsubscribe directly from the message, and to accurately record the Unsubscribe List.
9. An easy to use interface for first time software users to get quickly acquainted with it.