Hello,
I am an electronics and telecommunication engineer and my major is wireless systems' design. So far I have designed 2 PCBs based on nRF9160 and I am quite experienced with low voltage circuits, matching networks, antenna selection, filterrs, power amplifiers and multi layer PCBs hence I am quite sure that I can help you with your project. Just give me all the details and I will do my best to help you.
Best regards