I was referred by my college senior working in Hashedin. I mostly knew about cloud services that Hashedin is working with but was unaware that Embedded development is also the field this company is working in. Basically, it was a new domain this company is working on, but it has high objectives.

Process: Tech Interview 1 (coding), Tech Interview 2(System Design), Managerial Round, HR round

Round 1:

• Explain your current role and key skills.
• Explain UART communication.
  • Explain its working with packet/frame description
  • What is parity
  • How UART is synchronized
  • UART advantages
  • Is there an ack bit in the UART data frame?
• Explain Process and Threads
• Explain Mutex
• Coding Question (/archive/print-numbers-sequence-using-thread-synchronization/ )
• Coding Question (/archive/count-pairs-with-given-sum/ )

Round 2:

• Explain the Booting process in Microcontroller.
• Explain different registers involved in Microcontroller
• Explain a Microcontroller Block
• Explain Why a Micro-controller OR a Micro-processor is used, with examples.
• Memory Layout of a C Prog.
• Instruction SET of addition of 2 nos
• How to configure a GPIO pin on the microcontroller
• GPIO usage 
• Interrupt working along with the below code to check the output.

• Why a register memory is preferred in microcontrollers.
• Design a system with a Master ECU connected with a GPS, Motion sensor, and a Microcontroller. And the microcontroller is interfaced to give the data for temp, voltage, and current to the master.

Round 3:

• Strength and weaknesses
• Performance under pressure.
• Reason for a job switch.
• Skill Development techniques.
• Compatibility to work on Hardware Side in Embedded.

The last was the HR round with all compensation, benefits, and company-related topics. But overall my experience was positive the interviewers were polite and helpful.

For any embedded interview Embedded c/c++, Embedded Linux(RTOS), and bare-metal programming is a must, I did most of the coding preparations from the Practice area in GeeksforGeeks.