pcb design ISM Band Temperature/Humidity/Acceleration sensor

we are producer of IOT security devices and like to enhance the products by ISM Band Temperature sensor connected to our IOT devices. Design and layout of 868 MHz Temperature/humidity sensor unit including layout and firmware. Battery operated 2 year with CR2032 (soldered). Sending every 7 s Data. Data acknowledge (so need transmitter) Temperature sensor -20°C + 70°C + Humidity sensor Capable to be calibrated by software. Expandable to enable additional 3d acceleration sensor to be integrated on board as option. Option for PIR Sensor with light detection sensor. Sensor is connecting to IOT Modul. Self connecting. Sensor has UID. Up to handle 128 units with one IOT device (non collision support by statistic modulation duty cycle). low power microcontroller STM + ISM Transmitter + sheet metal antenna. Requirements: electrical engineer with experience in microcontroller and ISM Band RF design + firmware. preferred: experience in battery operated device development for low power design TIMEFRAME: ~ 1 month circuit + PCB design + 2 month firmware + Test + support industrialisation.