Qualcomm Software Engineer Interview Questions, Process, and Tips

Code for scheduling in C

• Define a struct for the task with fields like start time, end time, priority, etc.

• Create an array of tasks and sort them based on priority and start time

• Implement a scheduling algorithm like Round Robin or Priority Scheduling

• Use system calls like fork() and exec() to create and execute processes

• Implement synchronization mechanisms like semaphores or mutexes to avoid race conditions

Static, volatile, const are C keywords used to define properties of variables.

• Static: used to define a variable that retains its value between function calls

• Volatile: used to indicate that a variable's value may change unexpectedly, e.g. in an interrupt

• Const: used to define a variable whose value cannot be changed once initialized

Pseudo code to remove a node from a linked list

• Find the node to be removed

• Update the previous node's next pointer to point to the next node

• Free the memory occupied by the removed node

ISR stands for Interrupt Service Routine. It is managed by prioritizing interrupts and handling them in a timely manner.

• Prioritize interrupts based on their importance

• Handle interrupts in a timely manner to prevent delays in the system

• Ensure that the ISR does not interfere with the normal flow of the program

• Test the ISR thoroughly to ensure that it works as expected

• Use appropriate tools and techniques to debug any issu

Task is a unit of work, process is an instance of a program, and thread is a subset of a process.

• Task is a single unit of work that needs to be completed.

• Process is an instance of a program that is being executed.

• Thread is a subset of a process that can run concurrently with other threads.

• A process can have multiple threads, but a thread can only belong to one process.

• Threads share the same memory space, while processe...read more

Multi-threading, multi-processing and multi-tasking are different ways of achieving parallelism in computing.

• Multi-threading is a technique of dividing a single process into multiple threads that can run concurrently.

• Multi-processing is a technique of dividing a single process into multiple processes that can run concurrently.

• Multi-tasking is a technique of running multiple processes or tasks concurrently on a single p...read more

Mutex is a synchronization mechanism used to prevent multiple threads from accessing shared resources simultaneously.

• Mutex stands for mutual exclusion.

• It is used to protect shared resources from race conditions.

• Mutex provides exclusive access to a shared resource.

• It is used in multi-threaded programming.

• Mutex can be implemented using locks or semaphores.

I am a software engineer with experience in developing web applications and mobile apps.

• Developed a web application for a retail company using React and Node.js

• Created a mobile app for a fitness startup using React Native

• Worked on a project to automate data entry for a healthcare organization using Python

• Contributed to an open-source project for a social media platform using Ruby on Rails

I enjoy reading, playing video games, and hiking.

• Reading: I love to read books on various topics, including science fiction, history, and philosophy.

• Video games: I enjoy playing games that challenge my problem-solving skills, such as puzzle games and strategy games.

• Hiking: I like to explore new trails and enjoy the beauty of nature.

Qualcomm is a semiconductor and telecommunications equipment company based in San Diego, California.

• Qualcomm is a leading provider of wireless technology and services.

• They are known for their Snapdragon processors used in smartphones and other devices.

• Qualcomm has been involved in several legal disputes with Apple and other companies over patent infringement.

• They also have a strong presence in the development of 5G tec...read more

Developed a web application for online shopping with user authentication and payment gateway integration.

• Implemented user authentication using JWT tokens

• Integrated Stripe API for payment processing

• Designed responsive UI using React and Bootstrap

Insertion in binary search trees involves finding the appropriate position for a new node based on its value.

• Start at the root node and compare the value of the new node with the current node.

• If the new node's value is less than the current node, move to the left child node.

• If the new node's value is greater than the current node, move to the right child node.

• Repeat the comparison and movement until reaching a leaf nod...read more