The Efftronics Firmware Engineer interview includes an aptitude and C language test, followed by technical rounds on C, algorithms, digital electronics, and a final HR round assessing problem-solving and communication.

Before the interview, there was a written test (pen and paper) with fill in the blanks type questions. The test was based on domain knowledge, so make sure you have a strong grip on your core subject concepts. The questions were honestly quite tricky and unexpected — don't assume it'll be straightforward. Some questions may catch you off guard, so don't just prepare the basics. Go deeper into your domain and be ready for questions that test your understanding beyond the surface level.