As a developer of hardware, firmware and software, I have years of experience in fast prototyping using development kits integration, and also original design.
I have recent and deep experience in:
1) Touch sensing human interface, single buttons, lineal and circular sliders.
2) ARM, Microprocesor firmware programing, with RTOS.
3) Multy devices integration over a central processor unit:
GPS, MODEM, Accelerometers, BlueToothLE, USB periferics ,
light Sensing, Color , Temperature , humidity, IR Contactless Temperature Measurements.
4) Design of BlueTooth LE devices Central and Periferics.
5) 3D CAD Prototiping.
When I read your requirements it seems like you are listing my skills.
I have some ARM microprossesors 32 and 8 bits, BlusToothLE radios, and sensors I can put you at your disposal to start right away.