During my interview process for an embedded software developer position, I first completed an online application, followed by a technical phone screen where I discussed my previous projects and expertise.

Next, I was invited for on-site interviews that included both technical assessments and behavioral questions.

These assessments focused on my programming skills, particularly in C/C++, and my ability to solve problems related to hardware interfaces and real-time operating systems. The team was interested in how I handle debugging and optimizing code for embedded systems.

After this, I had a final meeting with HR to discuss salary and benefits.

The entire process was thorough but engaging, as it tested both my technical abilities and fit with the company culture.

Explain how you would optimize an ISR (Interrupt Service Routine) in an embedded system. What considerations would you take into account to ensure the system remains responsive and efficient?