Asterisk / IVR Expert Needed

Well established online "advice site"- needs to complete our Asterisk PBX system build:

Minimum of 3 years previous experience preferred.
Proven Experience with Asterisk 13 or later, Apache, Linux, PHP, (Laravel) and MySQL required.
Knowledge in TCP, SIP, RTP, UDP protocols.
Experience and advance usage of FreePBX or Elastix.

- Dial-plan programming in AGI, AMI, REST / ARI ( in PHP )
- IVR programming in AGI, AMI, REST / ARI ( in PHP )
- SIP trunk & Gateway integration with third party VoIP providers

Experience in REST API development and websockets.
Knowledge in authorize.net & paypal payment gateway
Knowledge in Git.
Strong troubleshooting skills a must