Atmega328p deepSleep Sigfox

I would like to read ADC values on atmega328P and send it over Sigfox network, then put it in deep sleep mode with lowest possible current draw (preferably less than 5uA) and wake it up every 15 minutes (timer0/1) to read again analog input which is connected to a pressure sensor (ADC in 10bit resolution), and send it again to Sigfox network. I have written the code for Arduino if it helps. Also, I can give some hints about Sigfox module if it's not working in your country/ or if you don't have it. I have board design and schematic for my work in Arduino if it's needed. Sigfox module datasheet is available at [login to view URL] I don't need any physical delivery. I'm just looking for the code, and probably possible PCB design based on negotiations.