4G SIM-based Security Camera Prototype

I am looking for an experienced electronics/IoT developer to build a **working prototype of a 4G SIM-based security camera and a simple mobile app**. The camera should work without Wi-Fi and connect to the internet using a SIM/4G network. ### Prototype Requirements * Camera with live video * 4G/SIM connectivity * Microphone + speaker for two-way communication * Battery powered * USB-C/external power or power bank support * Remote viewing from a mobile app * Basic camera controls * Simple backend/cloud connection * Prototype should support the concept of having multiple cameras at one location For the first stage, I am **not looking for a production-ready/custom-manufactured camera**. Commercially available development boards/modules can be used. The goal is to build **one complete working prototype** and demonstrate that the camera can be remotely accessed and controlled through the app over 4G or 5G Please mention: 1. Your experience with 4G/LTE camera or IoT projects. 2. Similar projects you have completed. 3. Hardware/platform you would recommend for the prototype. 4. Estimated time and cost for the prototype. Source code, firmware and project files should be handed over at completion.