I need a fully functional AI agent that plugs seamlessly into my existing website while also powering a companion mobile experience for both iOS and Android users. The core requirements are conversational intelligence, smooth integration with my site’s current tech stack, and a shared back-end so the same knowledge base drives consistent answers across all devices. You’ll handle everything from designing the agent’s dialogue flow and intent recognition to deploying the models on a secure, scalable back-end. Once the web component is live, I want wrappers or native apps published to the App Store and Google Play that call the same APIs, ensuring feature parity no matter where the user starts the conversation. I will provide access to the site’s repository and any branding assets; you bring the model selection, API orchestration, and mobile expertise. Clean, well-commented code, deployment instructions, and a brief video walkthrough will be the acceptance criteria.