Unlimited US-Canada SMS Server

I’m putting together a dedicated bulk-SMS server that lets me reach any U.S. or Canadian mobile number—no daily caps, throughput throttles, or carrier-imposed ceilings. The platform must handle both promotional and transactional traffic reliably, and keep my sender reputation intact while doing so... (Budget: $250 - $750 USD, Jobs: API, Cloud Computing, Linux, MySQL, Node.js, PHP, Software Architecture, Web Development)