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Qualcomm Senior Java Developer Interview Questions and Answers
Qualcomm Senior Java Developer Interview Experiences
1 interview found
Anonymous
I applied via Approached by Company and was interviewed in Jan 2024. There was 1 interview round.
(2 Questions)
- Q1. Mostly questions on Java 8 features, Spring basics some basic live examples
- Q2. Steam operations of student objects
- Ans.
Using Java Stream operations to manipulate student objects
Use Stream API to perform operations on a collection of student objects
Apply filter, map, reduce, and other stream operations to transform and manipulate data
Use lambda expressions to define the operations to be performed on each student object
Example: filtering students based on a certain criteria, mapping student names to uppercase, calculating the average gra
Skills evaluated in this interview
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I was interviewed before Apr 2021.
(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.
- 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
- 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...
- 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
- 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
- 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
- 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
Round duration - 30 minutes
Round difficulty - Easy
HR round with typical behavioral problems.
Interview Preparation Tips
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.
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.
Skills evaluated in this interview
I was interviewed before May 2016.
Interview Preparation Tips
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
I was interviewed before May 2021.
(1 Question)
Round duration - 60 Minutes
Round difficulty - Medium
Timing: Morning
How was the environment? It happened in the Computer Lab of my institution
All students were assigned a computer and we had to solve questions on hackerrank
- Q1.
Order of People Heights Problem Statement
Consider 'N' individuals numbered from 0 to N-1 standing in a queue. You are provided with two arrays:
HeightandInfront, each consisting of 'N' non-negative int... - Ans.
The task is to find the actual order of people in a queue based on their heights and the number of taller people in front of them.
Iterate through the given arrays and create a list of tuples containing the height and number of taller people for each person.
Sort the list of tuples in descending order of height and ascending order of the number of taller people.
Create an empty result list and insert each tuple into the r...
(1 Question)
Round duration - 60 Minutes
Round difficulty - Medium
Round was a mix of concepts from OOPS, OS and Problem Solving
- Q1.
Binary Search Tree Value Finder
Given a Binary Search Tree (BST) and a key value 'X', determine if there exists a node within the BST containing the value 'X'.
Example:
Input:
Consider the tree represe...
- Ans.
The task is to find if a given value is present in a Binary Search Tree (BST).
Start from the root node and compare the value with the target value.
If the value matches, return true.
If the target value is less than the current node value, move to the left child.
If the target value is greater than the current node value, move to the right child.
Repeat the process until a match is found or a leaf node is reached.
If a leaf...
Interview Preparation Tips
Tip 1 : Try to code the data structures that you have learned to understand things better
Tip 2 : Try to solve the problem even if it is the worst possible solution you think and then try to optimize don't jump to get the
best possible solution
Tip 3 : Discuss things among peers it helps to improve the understanding, even try to teach someone anything new you learn, this is very helpful during the interviews as you will have habit of explaining things
Tip 1 : Try to be honest in the resume don't write something you don't know, most of the time it backfires.
Tip 2 : Try to make 2 good projects for cv and know about the challenges you can face on the project and think about how you can solve that challenge.
Skills evaluated in this interview
I was interviewed before Sep 2020.
(1 Question)
Round duration - 45 minutes
Round difficulty - Medium
Its a zoom call interview which lasted for 45 minutes. initially there are two panel members in which one is very targetting at me. They asked me different type of questions like jumping from DSA to project then to python then again java. Its a mixed combo pack type interview. for each and every question they asked me the real time example. The discussion on my project lasted for 15-20 mins.
- Q1.
Count Set Bits Problem Statement
Given a positive integer
N, compute the total number of '1's in the binary representation of all numbers from 1 to N. Return this count modulo 1e9+7 because the result can... - Ans.
Count the total number of set bits in the binary representation of numbers from 1 to N modulo 1e9+7.
Use bitwise operations to count the set bits in each number from 1 to N.
Keep track of the total set bits and return the result modulo 1e9+7.
Optimize the solution to handle large values of N efficiently.
Consider using dynamic programming or precomputing values for faster computation.
Round duration - 30 mins
Round difficulty - Easy
This round was a zoom interview. The interview started with my brief introduction. This time the interview was more interested in my hobbies and passions. He asked me what do you do to keep yourself updated with the latest technology trends?
Interview Preparation Tips
Tip 1 : Do participate in all the coding contests, long challenges held by codechef, codeforces
Tip 2 : Practice all kinds of problems on leetcode, gfg, coding ninjas
Tip 3 : When you are writing a written exam for a particular company, make sure you get to know about the company in detail.
Tip 1 : Make your resume short and sweet(mostly 1 page, max 2 pages) is preferred.
Tip 2 : Make sure your resume is crisp rather than descriptive
Tip 3 : Do not lie on your resume
Skills evaluated in this interview
Selected
I applied via Company Website and was interviewed before Jan 2023. There were 2 interview rounds.
Simple Python Coding questions.
(1 Question)
- Q1. Logical questions on Memory allocation.
Interview Preparation Tips
Selected
I applied via Referral and was interviewed before Jul 2022. There were 3 interview rounds.
(1 Question)
- Q1. Questions about Thermal basics. JD also about melting point temperatures
(1 Question)
- Q1. Salary negotiations and joining date details
Selected
I applied via Approached by Company and was interviewed in Feb 2024. There were 3 interview rounds.
(2 Questions)
- Q1. What were your previous projects that you have worked on
- Ans.
I have worked on projects related to developing software for autonomous vehicles and implementing machine learning algorithms for predictive maintenance.
Developed software for autonomous vehicles to improve navigation and obstacle avoidance
Implemented machine learning algorithms for predictive maintenance in manufacturing plants
Collaborated with cross-functional teams to integrate new technologies into existing systems
- Q2. What all your technical skills and stacks that you have previously used for your projects
- Ans.
I have experience with Java, Python, SQL, AWS, Docker, and Kubernetes in my previous projects.
Java
Python
SQL
AWS
Docker
Kubernetes
(2 Questions)
- Q1. What is docker and why do we use it for containerising applications
- Ans.
Docker is a platform for developing, shipping, and running applications in containers.
Docker allows applications to be isolated in containers, making them portable and easy to deploy across different environments.
Containers share the host OS kernel but run as isolated processes, providing lightweight and efficient virtualization.
Docker simplifies the process of packaging applications and their dependencies, ensuring co...
- Q2. What is database normalisation and how your project benefited from it in the past
- Ans.
Database normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.
Database normalization involves breaking down data into smaller, more manageable tables and defining relationships between them.
It helps in reducing data redundancy, improving data integrity, and making the database more efficient.
For example, in a project I worked on, we normalized the database by spl...
(2 Questions)
- Q1. What has been your experience with challenging projects
- Ans.
I have extensive experience working on challenging projects in various industries.
Led a team in developing a complex software solution for a major client
Managed a project with tight deadlines and limited resources
Implemented innovative solutions to overcome technical obstacles
Collaborated with cross-functional teams to deliver successful outcomes
- Q2. How would you approach learning about new domain and technologies with a different background
- Ans.
I would approach learning about new domain and technologies with a different background by leveraging my existing skills, seeking out resources, and collaborating with experts in the field.
Identify key concepts and terminology in the new domain
Seek out online courses, tutorials, and books to gain foundational knowledge
Collaborate with colleagues or mentors who have experience in the new domain
Experiment with hands-on p...
Interview Preparation Tips
- IT Projects
- Python
- Reactjs
- Django
- Databases
Skills evaluated in this interview
(2 Questions)
- Q1. What is normalization
- Ans.
Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.
Normalization is used to eliminate data redundancy by breaking up tables into smaller, related tables.
It helps in reducing data anomalies such as insertion, update, and deletion anomalies.
Normalization is achieved through a series of stages called normal forms, with the most common being First Normal Form (1NF)...
- Q2. Code for armstrong alogrithm
- Ans.
Armstrong algorithm is used to find Armstrong numbers in a given range.
Iterate through the numbers in the given range
Calculate the sum of cubes of each digit in the number
Check if the sum is equal to the original number
Skills evaluated in this interview
Vaibhav Gupta
I applied via Company Website and was interviewed before May 2023. There was 1 interview round.
Questions related to digital and Analog electronics were asked
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