Cross-Platform AI SaaS Development

I need an end-to-end build of a SaaS application that layers AI capabilities onto a unified code-base and runs smoothly on Web, Mobile and Desktop. The core feature set will be finalised together, but... (Budget: ₹100 - ₹400 INR, Jobs: AI (Artificial Intelligence) HW/SW, AI Chatbot Development, AI Model Development, Django, Full Stack Development, Python, SaaS, Website Design)