Electrical Engineer for Raspberry Pi HATs

I am seeking an experienced electrical engineer for the schematic design and PCB layout of a new series of stackable input/output modules. The system architecture is already defined, and each module will use a standard microcontroller to communicate over an SPI bus. Your primary role will be designing the front-end circuitry for the various I/O module variations and creating the final PCB layouts. No software or firmware development is required. Because these boards will interface with various standard and industrial signals, you will need to design front-end circuits for several different variants. This includes designing for digital inputs and push-pull outputs up to 24V , relay outputs switching 250VAC at 2A , as well as analog front-ends for ±10V , 0-20mA , and PT100/PT1000 2-wire temperature sensors. A strict requirement for this project is extreme cost optimization. The target production cost is under $5 per module. Therefore, the schematic and layout must be specifically optimized for a Chinese supply chain. You will need to select standard, readily available Chinese components to keep the BOM cost to an absolute minimum while maintaining reliability.