Cellular pressure transducer firmware using Telit module

We are looking for some help to finish up the firmware on our cellular pressure transducer going through MQTT broker to our web portal. 1. We are using a pre certified cellular module from Telit, an eSIM from KORE to connect to the cell towers, a PIC microcontroller and a 2 MB Winbond memory chip to store the sensor data + logs. 2. Programming language – Embedded C IDE – MPLAB X 3. We are using Microsoft Azure as our cloud provider. The sensors will communicate to the cloud via MQTT broker. The firmware for the cellular sensor is 90% done. But we want to make it more robust, with no errors/issues and a lot of testing needs to be done. Some portions of the firmware code might need to be rewritten (too many interrupts) . There are few issues with the firmware code that we have encountered and we want someone to help us fix the issues and test. The code needs that last stage massaging to make it error-free & optimized.