You apply through company website, LinkedIn, or referral. HR shortlists based on resume, skills, and experience. C programming concepts (pointers, structures, memory) Microcontrollers (ARM, PIC, etc.) Communication protocols (UART, SPI, I2C, CAN) Interrupts RTOS basics Debugging methods

First stage was the written test. It contains general aptitude and electrical and electronics questions with two sets. One is MCQ and other one is theoretical. And ,then depends upon the performance the interview begins.