Hi,
I am an electrical engineer having an experience of four years in embedded industry.
I understand your requirements about bluetooth based fiband. I have design and implemented similar scheme with vibration sensor and usb charger.
I am a proficient microcontroller programmer for STM32, RPi, Arduino and beaglebone.
Recently i am working on bluetooth based wireless keyboard with extra features.
Do let me know if you have any queries/questions.
Let us at least get into the interview stage and discuss things.
Hoping to hear from you,
Jaydip Kathiriya