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Qualcomm SDE Interview Questions, Process, and Tips

Updated 9 Jan 2025

Top Qualcomm SDE Interview Questions and Answers

  • Q1. write a program with 2 threads. one thread should print even and other should print odd numbers in sequence. how would you make it SMP safe?
  • Q2. How would you know .. your system is little endian or big endian??
  • Q3. how a function from one user process can be called in other user process?
View all 8 questions

Qualcomm SDE Interview Experiences

3 interviews found

SDE Interview Questions & Answers

user image Anonymous

posted on 12 Dec 2024

Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. Link list reversal
  • Q2. OS all concepts

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SDE Interview Questions & Answers

user image Anonymous

posted on 9 Jan 2025

Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(1 Question)

  • Q1. Two-Sum Problem

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SDE Interview Questions & Answers

user image Anonymous

posted on 4 Jun 2015

Interview Questionnaire 

8 Questions

  • Q1. How would you know .. your system is little endian or big endian??
  • Ans. 

    Endianess refers to the order in which bytes are stored in memory. Little endian stores the least significant byte first.

    • Check the byte order of a multi-byte integer value

    • Use a test value with known byte order to determine the system's endianess

    • Check the system's documentation or specifications

    • Use a code snippet to determine the endianess

  • Answered by AI
  • Q2. How function pointers are shared across different processes? using which iPCs?
  • Ans. 

    Function pointers can be shared across processes using inter-process communication mechanisms like shared memory, pipes, sockets, etc.

    • Function pointers can be stored in shared memory regions that are accessible by multiple processes.

    • Processes can communicate with each other using pipes or sockets and pass function pointers as arguments.

    • Remote Procedure Call (RPC) mechanisms can also be used to share function pointers a...

  • Answered by AI
  • Q3. What is binder in android?
  • Ans. 

    Binder is a mechanism for inter-process communication in Android.

    • Binder allows different processes to communicate with each other.

    • It is used for implementing Android's IPC (Inter-Process Communication) system.

    • Binder uses a client-server model where the client sends requests to the server and the server responds with the requested data.

    • It is used for sharing data between different components of an Android application.

    • Bi...

  • Answered by AI
  • Q4. How sysctrl works?
  • Ans. 

    sysctrl is a system control utility used to manage system settings and configurations.

    • sysctrl is used to manage system settings and configurations such as network settings, power management, and hardware configurations.

    • It can be used to start, stop, and restart system services.

    • sysctrl is commonly used in Linux and Unix-based operating systems.

    • Examples of sysctrl commands include 'sysctrl -p' to reload all settings from...

  • Answered by AI
  • Q5. Explain device tree concepts in linux
  • Ans. 

    Device tree is a data structure used to describe hardware components in a system and their interconnections.

    • Device tree is used in embedded systems to provide a standardized way of describing hardware components.

    • It is written in a language called Device Tree Source (DTS) and compiled into a binary format called Device Tree Blob (DTB).

    • The device tree is loaded by the bootloader and used by the kernel to configure the ha...

  • Answered by AI
  • Q6. Mention 4 IPCs used in user level process in linux
  • Ans. 

    4 IPCs used in user level process in Linux

    • Message Queues - allows processes to exchange data through messages

    • Shared Memory - allows processes to share a portion of memory

    • Semaphores - used for synchronization between processes

    • Pipes - allows communication between two related processes

  • Answered by AI
  • Q7. How a function from one user process can be called in other user process?
  • Ans. 

    Inter-process communication mechanisms like pipes, sockets, message queues, shared memory can be used to call a function from one user process to another.

    • Use pipes to establish a unidirectional communication channel between two processes.

    • Use sockets to establish a bidirectional communication channel between two processes.

    • Use message queues to send messages between processes.

    • Use shared memory to share data between proce...

  • Answered by AI
  • Q8. Write a program with 2 threads. one thread should print even and other should print odd numbers in sequence. how would you make it SMP safe?
  • Ans. 

    Program with 2 threads printing even and odd numbers in sequence. How to make it SMP safe?

    • Use mutex locks to ensure only one thread accesses the shared resource (the number to be printed) at a time

    • Use condition variables to signal when it's safe for the other thread to access the shared resource

    • Use atomic variables to ensure that the shared resource is accessed atomically

    • Use thread-safe data structures to store the sha...

  • Answered by AI

Interview Preparation Tips

Round: Technical Interview
Experience: These are the few questions that i remember from my Qualcomm interview that i faced in march '13 :
#How would you know .. your system is little endian or big endian??
#how function pointers are shared across different processes? using which iPCs?
#what is binder in android?
#how sysctrl works?
#explain device tree concepts in linux.
#mention 4 IPCs used in user level process in linux.
#how a function from one user process can be called in other user process?
#write a program with 2 threads. one thread should print even and other should print odd numbers in sequence. how would you make it SMP safe?

College Name: NA

Skills evaluated in this interview

Interview questions from similar companies

Interview experience
3
Average
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

Medium difficulty level of questions

Interview Preparation Tips

Interview preparation tips for other job seekers - Good

SDE Interview Questions & Answers

Broadcom user image Anonymous

posted on 23 Aug 2024

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Naukri.com and was interviewed in Jul 2024. There was 1 interview round.

Round 1 - One-on-one 

(1 Question)

  • Q1. STring manipulation

Software Engineer Interview Questions & Answers

Intel user image Niranjhana Narayanan

posted on 4 Dec 2016

I applied via Campus Placement and was interviewed in Dec 2016. There were 5 interview rounds.

Interview Questionnaire 

2 Questions

  • Q1. Why UDP and not TCP in project
  • Ans. 

    UDP is preferred over TCP in this project due to its low latency and lightweight nature.

    • UDP is a connectionless protocol, which means it does not establish a direct connection between the sender and receiver.

    • UDP is faster than TCP as it does not have the overhead of establishing and maintaining a connection.

    • UDP is suitable for applications where real-time data transmission is crucial, such as video streaming or online ...

  • Answered by AI
  • Q2. How would you clear the 7th bit in a 32 bit register
  • Ans. 

    To clear the 7th bit in a 32-bit register, perform a bitwise AND operation with a mask that has all bits set to 1 except the 7th bit.

    • Create a mask with the 7th bit set to 0 and all other bits set to 1

    • Perform a bitwise AND operation between the register and the mask

    • Store the result back in the register

  • Answered by AI

Interview Preparation Tips

Round: Test
Experience: Questions were based on C concepts, given piece of code, find error, output, etc then data structures, bit manipulation, a few aptitude questions were also there (around 5-7).
Tips: Practice aptitude, C, data structures (geeksforgeeks.org is a good source).
Duration: 1 hour
Total Questions: 30

Round: Technical + HR Interview
Experience: I was asked to explain project in detail, I had done projects on embedded, so was asked about that, details like what fields did you use in that structure, why this implementation and not some related other. Memory management, network communications, operating systems. Then questions on C concepts like memory allocation, function pointers, then data structures like linked lists, then bit manipulation in registers. Questions from electrical coursework. Then later, why higher studies, would you still go for higher studies if you had a good job at a company, why etc.
Tips: Be thorough with C (know your Kernighan & Ritchie) and be prepared to go into details about your projects.

Skills: C, Data Structures, Coursework Understanding, Project And Internship
College Name: IIT Madras

Skills evaluated in this interview

Interview Preparation Tips

Round: Technical Interview
Experience: questions were mainly asked on C, data structures linked lists, wireless communications. i was asked questions on pointers, linked lists, difference between structures and unions, endien-ness(big or little)
about microprocesors- interrupt scheme: which scheme is better , when?
about assembly programming.
They may ask you to write assembly codes/C program
emphasis is on the logic used and not so much on the syntax.

Tips: do C really well. they ask you about projects. also do communication subjects, microprocessors.
they prefer if you know about data structures and OS but it's okay even if you don't.
be honest. if you don't know something say you don't.
do your final year project well.

College Name: Veermata Jijabai Technological Institute, Mumbai [ VJTI ]

I was interviewed before Apr 2021.

Round 1 - Face to Face 

(7 Questions)

Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with questions on OOPS and OS mainly.

  • Q1. What are Little Endian and Big Endian in the context of computer architecture?
  • Ans. 

    Little Endian and Big Endian refer to the order in which bytes are stored in computer memory.

    • Little Endian stores the least significant byte first, while Big Endian stores the most significant byte first.

    • Little Endian is commonly used in x86 architecture, while Big Endian is used in architectures like SPARC and PowerPC.

    • Endianness can affect data transmission between systems with different byte orders.

  • Answered by AI
  • Q2. Write a program to determine if your system is little-endian or big-endian.
  • Ans. 

    Program to determine system's endianness

    • Check the endianness by storing a multi-byte integer and checking the byte order

    • Use bitwise operations to extract the least significant byte

    • If the least significant byte is at the lowest memory address, it's little-endian

    • If the least significant byte is at the highest memory address, it's big-endian

  • Answered by AI
  • Q3. What is the volatile keyword in programming?
  • Ans. 

    The volatile keyword in programming is used to indicate that a variable's value can be changed unexpectedly.

    • Volatile keyword is used in multithreaded programming to prevent compiler optimizations on variables that can be changed by other threads.

    • It tells the compiler not to cache the variable's value in a register, ensuring that every access is made to the variable's memory location.

    • Commonly used in embedded systems pr...

  • Answered by AI
  • Q4. What is the use of a function pointer in C?
  • Ans. 

    Function pointers in C are used to store the address of functions, allowing for dynamic function calls and callbacks.

    • Function pointers can be used to implement callbacks in event-driven programming.

    • They can be used to switch between different functions at runtime.

    • Function pointers are commonly used in implementing data structures like function pointers in an array of function pointers.

    • Example: void (*funcPtr)(int) = &a

  • Answered by AI
  • Q5. Design a data structure to implement multi-threading.
  • Ans. 

    Design a data structure for multi-threading

    • Use a thread-safe queue to manage tasks for each thread

    • Implement a lock or semaphore to control access to shared resources

    • Consider using condition variables for synchronization

    • Use atomic operations for shared variables to prevent race conditions

  • Answered by AI
  • Q6. What does a kernel do?
  • Ans. 

    The kernel is the core component of an operating system that manages system resources and provides a bridge between software and hardware.

    • Manages system resources such as CPU, memory, and I/O devices

    • Provides a bridge between software applications and hardware components

    • Handles tasks such as process scheduling, memory management, and device drivers

    • Controls communication between hardware and software layers

  • Answered by AI
  • Q7. What is a storage class in programming?
  • Ans. 

    A storage class in programming defines the scope and lifetime of variables.

    • Storage classes include auto, register, static, and extern.

    • Auto variables are created when a function is called and destroyed when the function ends.

    • Register variables are stored in CPU registers for faster access.

    • Static variables retain their value between function calls.

    • Extern variables are declared outside of any function and can be accessed

  • Answered by AI
Round 2 - HR 

Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.

Interview Preparation Tips

Eligibility criteriaAbove 7 CGPANVIDIA interview preparation:Topics to prepare for the interview - Data Structures, Algorithms, Operating Systems, Aptitude, OOPSTime required to prepare for the interview - 6 monthsInterview preparation tips for other job seekers

Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.

Application resume tips for other job seekers

Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.

Final outcome of the interviewSelected

Skills evaluated in this interview

I applied via Campus Placement and was interviewed in Dec 2016. There was 1 interview round.

Interview Questionnaire 

7 Questions

  • Q1. Phases of compiler
  • Ans. 

    Phases of compiler include lexical analysis, syntax analysis, semantic analysis, code generation, and optimization.

    • Lexical analysis: breaking down input into tokens

    • Syntax analysis: checking if tokens form valid syntax

    • Semantic analysis: checking if syntax is semantically correct

    • Code generation: generating machine code from input

    • Optimization: improving generated code performance

  • Answered by AI
  • Q2. Compiler optimisations
  • Q3. Why to c over cpp
  • Ans. 

    C is preferred over C++ for certain applications due to its simplicity and efficiency.

    • C is a simpler language compared to C++ and has a smaller runtime footprint.

    • C is often used for low-level programming, embedded systems, and operating systems.

    • C allows for more control over memory management and can be faster in certain scenarios.

    • C++ introduces additional features like object-oriented programming and templates, which

  • Answered by AI
  • Q4. Classes and structure and memory allocation for them
  • Ans. 

    Classes are blueprints for creating objects, while structures are similar but with different default access levels.

    • Classes and structures are used to define the structure and behavior of objects in object-oriented programming.

    • Classes are reference types and are allocated on the heap, while structures are value types and are allocated on the stack.

    • Memory allocation for classes is managed by garbage collection, while mem...

  • Answered by AI
  • Q5. My research area
  • Q6. My professional experience
  • Q7. Knowledge in cpp, c and debugging

Interview Preparation Tips

Round: Technical Interview
Experience: Asked about, basic cpp, c. compiler optimisations and phases, lex and yacc. why and how compiler optimisations help.
Tips: Its good.

Round: Technical Interview
Experience: How good am i in c, cpp. My research area.
Tips: Question where not clear to me. when asked how good are you in cpp, in debugging, in firmware I was not able to understand what the interviewer was looking for.

College Name: IIT Madras

Skills evaluated in this interview

I was interviewed before May 2016.

Interview Preparation Tips

Round: written test
Experience: it was elitmus test conducted by the company itself on campus. As per my knowledge only those scoring 90 percentile got selected for round 2.
Tips: Attempt only those ques that are necessary for scoring 90+ in e litmus. Specially in verbal don't attempt more then required questions, though you might be tempted. The aim is not to score max bt to score 90+

Round: Technical Interview
Experience: This was a programming based round. I was asked to write algorithms for various array linked list based problems. There was cross questioning prompting to reduce complexity and to use different data structures for same problems.

Mostly it focused on subjects like c, data structures and ADA.
Tips: Be clear with basic of data structures and algorithms. Pointers, queue, stacks, array linked lists, sorting etc are the keywords.

Round: Technical Interview
Experience: This was a information security specific round since that was my major. In depth cross questioning on my thesis topics, honeypots, network intrusion etc. Security certificates, and on the go problems to provide security solution layer wise in different scenarios. Security concept of torrents was also asked in detail.
Tips: It was more of a security discussion and throwing of ideas about how things in a particular case could work or could not. Don't worry about right or wrong answer just be clear with your reasoning about the solution you are suggesting.

Round: Other Interview
Experience: I don't know what to name this round, but it focused mainly on developing test cases for an object. Say they gave me a stapler and said to develop a test plan listing down test cases for a given object to pass so that it can be confirmed that it is a stapler. Another scenario was with a lift.
Tips: This is one round where your presence of mind and inter personal skills matter. I think the way you present your thoughts was most important here.

Round: Behavioural Interview
Experience: This was was mostly about how would you react in a given professional situation
Like your assigned work could not be completed on time, or if you are doing something wrong with the work assigned.
Tips: This is all about inter personal skills and putting your best foot forward :)

College Name: Indira Gandhi Delhi Technical University For Women, Delhi
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Qualcomm Interview FAQs

How many rounds are there in Qualcomm SDE interview?
Qualcomm interview process usually has 1 rounds. The most common rounds in the Qualcomm interview process are Technical.
What are the top questions asked in Qualcomm SDE interview?

Some of the top questions asked at the Qualcomm SDE interview -

  1. write a program with 2 threads. one thread should print even and other should p...read more
  2. How would you know .. your system is little endian or big endia...read more
  3. how a function from one user process can be called in other user proce...read more

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Qualcomm SDE Interview Process

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