The process was quite slow and mismanaged.

I applied through the career section in May and received an email in June to take an online test. There was silence for more than a month.

In mid-July, I received a call from HR for a remote tele-presence interview based on the test results. It was a four-hour discussion with four different members (including the hiring manager) without any breaks.

One interviewer was yawning and seemed sleepy, while the other two were quite cold in their behavior.

There was no response thereafter, and even HR did not respond when I asked for feedback. This was quite unprofessional behavior.

C test: Two sets of functions to implement in C within 1.5 hours. Not very difficult if you are a regular, hands-on programmer.

Interview questions:

• Low-level firmware steps to implement data acquisition using an 8-channel ADC.
• How does an ADC work?
• How to implement a firmware update scheme?
• How to differentiate a valid binary image from a malicious one (hint: use signature authentication)?

Some irrelevant questions like:

• How will you implement Sudoku in C?

• Logic to implement the VI editor.

• How will you recover if a process crashes while holding a mutex and another process is waiting on it? (This is very specific to OS, and Linux solves this using the concept of a "robust mutex".)

• What are some of the challenging problems you have solved? Explain projects.