I applied for a software engineer position at Qualcomm in August. I had a phone interview at the end of September. After two weeks, the HR emailed me an invitation for an onsite interview. At the end of October, I went to San Diego for the onsite.

Phone Interview:

1. What is the static keyword?
2. What is a for loop?
3. What are the differences between struct and union?
4. What is Binary Tree inorder traversal?
5. What is a Binary Heap?
6. Is a Binary Heap totally in order?
7. What is Cache?
8. IPv4 vs. IPv6 differences.
9. What are the two parts of IPv6 addresses?
10. Programming: Byte Reverse of an integer.

Onsite:

4 technical, 1 director lunch, 1 HR

Round 1: All previous projects in detail. C programming: Sort an integer array. Time Complexity.

Round 2: Projects in detail. Programming: Binary Tree inorder Traversal. Stack overflow.

Round 3: A lot of questions in C, OS, and Network:

• OSI 7 layers
• TCP vs. UDP
• static keyword
• struct vs. union differences
• sizeof()
• When to use pass by value and pass by reference
• Process vs. Thread
• Memory leak
• Context switch
• Stack vs. Heap
• Interrupt
• Priority inversion
• Memory corruption
• Deadlock

Programming:

1. Output the number of 1s in an integer.
2. Given a number, if it is a Fibonacci number, output true, else false.

Round 4:

1. static keyword
2. Priority Inversion
3. Context switch
4. Stack overflow
5. struct vs. union
6. Stack vs. Heap
7. Memory map

Programming:

1. Reverse Bits of an unsigned 16-bit integer.
2. All non-negative integers. The first array is missing a number to form the second array (the missing number is replaced by 0). And then shuffle the second array. Try to find the missing number.

Lunch Interview:

Just check my background and then chat:)

HR:

Ask basic questions about background, start time, visa, and salary expectation. Talk about Qualcomm employee's benefits package. Ask questions if you have. Just casual talk:)