If you have any questions regarding Linux BSP ask here. I have 4.5+ years of experience in Linux BSP and Firmware combined. I am happy to help in any of above 2 field questions you might have.
Ps: if I can't answer don't worry I will return the payment with UPI.
This the skill set I have hands on experience. I have worked on more things but don't have in depth grasp so not included here.
Software development: Firmware, Linux CLI application, Linux device driver Bring up
Microprocessors boards: VIM3L, Raspberry PI, NanoPCT-4
CPU Architectures: Arm cortex M3/4, Armv7, Armv8
Hardware debug tools: St-link, J-link, TTL, Logic Analyzer, multimeter
IDE's: Keil, STM32CubeIDE, Seger studio & VS Code
Microcontrollers: STM32 and NRF52
Programming language: C, C++, Python
Communication Protocols: SPI, UART, I2C, BLE & LoRa
Software development tools: vim, ssh, Git, Build root