An MCU developer designs, programs, and debugs systems using microcontrollers. They write embedded software in languages like C or C++, and use real-time operating systems. They interact with peripherals such as GPIO, UART, SPI, , and more. They may also design PCBs using the and debug hardware/software issues. They optimize code for performance and power consumption, and may also develop protocols for communication between the and other devices. Additionally, they write technical documentation and work collaboratively with other engineers to integrate the microcontroller into larger systems.