I have used STM32 microcontrollers in all my projects. I work with a large number of digital interfaces, and I see no obstacles to learning new ones.A pleasant experience of working with RTOS (FreeRTOS) in applications with multithreading,and use a large number of different libraries, such as FatFs, lwIP, USB(MSHC), GUI(Touchgfx), etc.and achieve stable and pleasant operation of the device. But the use of RTOS depends on the situation, nothing prevents you from writing on bare metal.In addition to writing firmware, I was engaged in the circuitry of digital devices,the calculation of DC/DC, the calculation of communication lines for SDRAM and,in general, the architecture of devices. If necessary, I can perform calculations of vibration loadson the board and thermal loads. I was developing a PCB with a maximum number of layers of 6 pcs.I designed enclosures for my devices, taking into account the requirements for tightness. Mainly prod milling. Subsequently, I'm developmen conducted seminars among the assembly shop workers:"3D modeling of technological equipment and printing on a 3D printer",after which he took two people into my team to help in development. Since there is no junior developer position in my organization, the first year I worked in the assembly shop,was responsible for the assembly of PCB, calibration of sensors. So I have good soldering skills,debugging, working with various measuring equipment.I get pleasure from bringing people's ideas to life.