I applied online.

First, there was a technical phone interview. The interviewer was a staff engineer, and it lasted approximately 1 hour and 15 minutes.

A week later, I was invited for an on-site interview. The on-site interview was almost a half-day event.

Four different people conducted separate technical interviews, each lasting 50 minutes. Following these, there was a short HR interview that lasted 15 minutes.

Questions were related to Wireless Communications and Programming.

Wireless Communications:

• Shannon's rule
• SNR
• Bandwidth
• Throughput
• Difference between GSM, CDMA, and LTE
• Convolution concepts
• Call flow in LTE
• L1-L2 layers
• Modulation schemes

Programming:

• C++
• Python
• Bit manipulation
• Linked lists
• Multiple inheritance
• Finding the missing number in incoming random integers
• Test case plan
• Big picture for test cases, etc.