First interview with HR. HR was very friendly and helpful.

Second interview with director-level engineer. This interview mostly covered learning your motivation and basic understanding of related subjects.

Third onsite interview.

Offer Period.

First, by phone:

• About concepts in RTOS, Semaphores, and Mutexes, but mostly behavioral.

Later, onsite:

• Basic CS interview questions.
• Hashing.
• Design a parking lot (mostly to show your data structure understanding).
• Linked list questions, like adding or finding a node.
• Time and space complexity analysis about the parking lot.