I have a high bid, but you are paying for efficiency, performance, knowledge, and an extensive network of additional resources in exactly this field.
Over 4 years of intensive experience leading government contracting work with fortune 500 contracting companies on projects using similar technology, including published papers. Firm-fixed-price and on time as is required in such work.
4 years of thorough experience in all but bullet point 4:
Willing to learn, have experience in Arduino, RPi and other single board computers
Similar projects include: Custom autopilot software and control libraries for drones, airplanes, and land vehicles running custom sensors arrays running over RS232, RS422, i2c, SPI. Similar tech used in said projects: Link16, SMS, GPS, RTK, IMU, LIDAR, RTOS, and more in smaller capacities.
Most electronics required custom board fabrication. All designed for low latency and mil-spec operating conditions.