Bilingual OmniChannel Campaign Platform

I need a full-stack web application that lets me create and run customised communication campaigns—very similar to the way utility companies issue bills—only across Email, WhatsApp and SMS at the same time... (Budget: ₹75000 - ₹150000 INR, Jobs: API Development, Django, FastAPI, Full Stack Development, HTML, Node.js, PHP, PostgreSQL, Software Architecture, Website Design)