Embedded firmware developer required

General information for the business: Design/manufacture of handheld electronic products Kind of development:Embedded firmware authoring Description of requirements/functionality: I am looking for some help on a commercial product design. I have achieved basic functionality in setting up a menu function and driving a 64 x 128 mono OLED display as well as reading switches and driving 2 outputs. I have implemented the SAMD21on Arduino platform for evaluation purposes but I am open to all suggestions to take the project forward including the firmware/hardware platforms as the project is currently in it's infancy. CMS and Admin requirements: Invoices required for all work along with detailed work reports. Specific technologies required: Arduino, ARM Cortex SAMD21 32 bit, OLED control OS requirements: Windows, Mac OS Extra notes: The final product will incorporate various types of sensor inputs with a graphical representation being required to visually represent the sensor stimuli. One of the main challenges is controlling the display whilst simultaneously controlling output pulses of varying frequency and duration.