Embedded firmware for stm32 chip

I'm in need of a professional with solid experience in embedded firmware programming. The focus is on the STM32F103c8 series, hence prior work on this model is crucial. Expected functionalities for the chip are unspecified as the embedded firmware should ideally incorporate real-time operating system, communication protocols (UART, SPI, I2C), and sensor integration and data acquisition. However, I am open to possibilities and would appreciate any strategic proposals to make the project an absolute success. If you really want to stand out, your application must clearly articulate your experience in embedded firmware development and how this applies to the STM32F4 series specifically.