Experience with FreeRTOS, Zephyr, QNX, VxWorks, ThreadX, PREEMPT_RT, ARM-based controllers, device drivers, BSPs, Yocto/Buildroot, industrial communication protocols, and JTAG/GDB/oscilloscope/logic-analyzer debugging. Strong knowledge of Real-Time Operating Systems, including tasks/threads, scheduling, priorities, context switching, mutexes/semaphores, queues, synchronization, priority inversion, latency, jitter, and deterministic execution.