ESP32 Cloud-Linked App & Firmware

I have an ESP32 board fitted with a reed sensor and a GSM module. My objective is to move all sensor events securely to the cloud and surface them inside a polished mobile application that runs on both iOS and Android... (Budget: ₹600 - ₹1500 INR, Jobs: Android, API Development, Arduino, Bluetooth Low Energy (BLE), Cloud Computing, iOS Development, Mobile App Development, MQTT)