Ongoing FreePBX Custom Module and App Development

Looking for a skilled developer to help develop custom features and apps to work in hand with FreePBX. This would be an ongoing relationship, as our customer base is constantly putting in feature requests. First project would be to develop an application that links to PBX users and utilizes SIP Trunks for sending and receiving SMS messages. Within the sending and receiving, we will need the ability to create groups for mass outgoing, but in a way that each end user is messaged individually so the responses only come to the sender and not to each member in the group.
Additional projects will be discussed with the awarded developer.