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Cognizant Software Engineer Interview Questions and Answers
100 Interview questions
The Singleton design pattern restricts a class to a single instance and provides a global access point to that instance.
Ensures a class has only one instance.
Provides a global point of access to that instance.
Useful for managing shared resources, like database connections.
Implemented using private constructors and static methods.
Example in Java: public class Singleton { private static Singleton instance; private S...
A HashMap uses a hash table to store key-value pairs, allowing for efficient data retrieval and storage.
HashMap uses an array of buckets to store entries, where each bucket can hold multiple entries in case of collisions.
A hash function computes an index based on the key, determining where to store the value in the array.
When two keys hash to the same index, a collision occurs, which is typically handled using cha...
An .exe file is an executable file format used to run programs on Windows operating systems.
Executable Format: .exe files contain a program that can be executed directly by the operating system.
Windows OS: Primarily used in Windows environments, .exe files are not natively supported by other operating systems like macOS or Linux.
Installation Packages: Many software applications are distributed as .exe files, such ...
Transfer data from on-premise SQL Server to Azure Data Lake Storage (ADLS) and then to Azure SQL Database efficiently.
Use Azure Data Factory: Create a pipeline in Azure Data Factory to copy data from SQL Server to ADLS using the Copy Data tool.
Linked Services: Set up linked services in Azure Data Factory for both the on-premise SQL Server and ADLS to facilitate data transfer.
Integration Runtime: Use a Self-hosted ...
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Lookup activity is used in Azure Data Factory to retrieve a single row from a dataset based on a specified key.
Lookup activity is used to retrieve data from a database or file system in Azure Data Factory.
It can be used to perform lookups on tables, views, or files.
The lookup activity requires a dataset and a query to specify the data to retrieve.
It is commonly used in data integration pipelines to fetch reference...
OOP concepts include encapsulation, inheritance, polymorphism, and abstraction.
Encapsulation: Bundling data and methods that operate on the data into a single unit (class).
Inheritance: Allows a class to inherit properties and behavior from another class.
Polymorphism: Objects of different classes can be treated as objects of a common superclass.
Abstraction: Hides complex implementation details and only shows the ne...
List is mutable and can be modified, while tuple is immutable and cannot be changed.
Lists are defined using square brackets [], while tuples are defined using parentheses ().
Elements in a list can be changed, added, or removed, while elements in a tuple cannot be modified once it is created.
Lists are typically used for collections of similar items that may need to be modified, while tuples are used for fixed colle...
Physical file stores data on disk, while logical file is a view of data from physical files.
Physical file contains actual data on disk
Logical file is a view of data from one or more physical files
Physical file is used for storage and retrieval of data
Logical file simplifies data access by providing a single view of related data
Changes to physical file structure affect all logical files based on it
To declare a file in software development, you typically need to specify the file type, name, and location.
Use a file declaration statement in the programming language you are using (e.g. 'File myFile = new File("example.txt");' in Java)
Specify the file type if necessary (e.g. '.txt' for text files, '.csv' for CSV files)
Provide the file name and location within the declaration statement (e.g. 'example.txt' or 'C:/...
Arrays are data structures that store multiple values of the same type in a single variable, allowing efficient data management.
Arrays are indexed collections, meaning each element can be accessed using its index. Example: `String[] fruits = {"Apple", "Banana", "Cherry"};`
They have a fixed size, defined at the time of creation. Example: `int[] numbers = new int[5];` creates an array of 5 integers.
Arrays can hold p...
Cognizant Software Engineer Interview Experiences
214 interviews found
Anonymous
Selected
(5 Questions)
- Q1. What is Adls?how is it works
- Ans.
Azure Data Lake Storage (ADLS) is a scalable data storage service for big data analytics in the cloud.
ADLS is designed for big data analytics, allowing storage of large amounts of unstructured data.
It integrates seamlessly with Azure services like Azure Databricks and Azure HDInsight.
ADLS supports hierarchical namespace, enabling efficient organization of data in directories.
It provides fine-grained access control usin...
- Q2. What is integration pipeline?how is it work?
- Ans.
An integration pipeline automates the process of integrating code changes into a shared repository, ensuring quality and consistency.
Continuous Integration (CI) is a key component, where developers frequently merge code changes.
Automated tests run on each integration to catch bugs early, e.g., unit tests, integration tests.
Build automation tools like Jenkins or Travis CI are often used to manage the pipeline.
Deployment...
- Q3. Copy data from one on premise sql server to Adls and Adls to Azure SQL?
- Q4. What is Azuredata bricks?
- Q5. What is cluster? How is it work?
- Ans.
A cluster is a group of interconnected computers that work together to perform tasks as a single system.
Clusters improve performance by distributing workloads across multiple machines.
They provide redundancy; if one node fails, others can take over (e.g., database clusters).
Common types include load-balancing clusters and high-availability clusters.
Examples include Hadoop clusters for big data processing and Kubernetes...
Interview Preparation Tips
I applied via Company Website and was interviewed in Nov 2024. There were 3 interview rounds.
Standard quantitative questions accompanied by logical reasoning and related topics.
(4 Questions)
- Q1. Asked about my projects.
- Q2. What are the basic Object-Oriented Programming (OOP) concepts, including polymorphism and inheritance?
- Ans.
OOP concepts include encapsulation, inheritance, polymorphism, and abstraction.
Encapsulation: Bundling data and methods that operate on the data into a single unit (class).
Inheritance: Allows a class to inherit properties and behavior from another class.
Polymorphism: Objects of different classes can be treated as objects of a common superclass.
Abstraction: Hides complex implementation details and only shows the necessa...
- Q3. Can you explain React, how it functions, and the related concepts?
- Ans.
React is a JavaScript library for building user interfaces.
React allows developers to create reusable UI components.
It uses a virtual DOM for efficient rendering.
React uses a declarative approach to define how the UI should look based on the application state.
It supports server-side rendering for improved performance.
React can be used with other libraries like Redux for state management.
- Q4. About my final year project and how would you improve it?
(2 Questions)
- Q1. Can you introduce yourself and provide some information about your family?
- Ans.
I am a software engineer with a passion for coding and problem-solving. I come from a close-knit family with supportive parents and siblings.
Software engineer with coding and problem-solving skills
Close-knit family with supportive parents and siblings
- Q2. What are your strengths and weaknesses, and how are you addressing your weaknesses?
- Ans.
My strengths include problem-solving and teamwork, while my weaknesses are time management and public speaking. I am addressing my weaknesses by taking time management courses and practicing public speaking.
Strengths: problem-solving, teamwork
Weaknesses: time management, public speaking
Addressing weaknesses: taking time management courses, practicing public speaking
Interview Preparation Tips
I appeared for an interview in May 2025, where I was asked the following questions.
- Q1. What is java?
- Q2. What are in opps concepts?
mounika chittinni
I applied via Walk-in and was interviewed in Nov 2024. There were 5 interview rounds.
Aptitude is one of best round, to improve our skills knowledge technology.
GD is one of best round, because I love this round, sharing my knowledge ideas thinking views, to others for company growth organization growth, this round shows how much skills r there in person can be easily identified .
(2 Questions)
- Q1. Urs work experience ?
- Q2. Urs new skills ?
- Ans.
I have recently acquired skills in machine learning and data analysis.
Completed online courses in machine learning algorithms
Practiced data analysis techniques using Python and R
Attended workshops on deep learning models
(2 Questions)
- Q1. Do u act as team lead?
- Q2. Urs projects
(2 Questions)
- Q1. On technical how could u work from projects to projects
- Q2. How many days u will work on single project
- Ans.
The duration of working on a single project varies depending on the project complexity and requirements.
The duration of working on a single project can range from a few days to several months or even years.
Factors such as project scope, team size, resources, and deadlines influence the duration of the project.
For example, a small project with a clear scope may take a few days to complete, while a large-scale project ma...
Interview Preparation Tips
- Aws Devops Python
Selected
I applied via Campus Placement and was interviewed in Nov 2024. There were 2 interview rounds.
Simple aptitude questions, multiple-choice questions, database management systems, and data structures.
(3 Questions)
- Q1. What is the difference between a list and a tuple in Python?
- Ans.
List is mutable and can be modified, while tuple is immutable and cannot be changed.
Lists are defined using square brackets [], while tuples are defined using parentheses ().
Elements in a list can be changed, added, or removed, while elements in a tuple cannot be modified once it is created.
Lists are typically used for collections of similar items that may need to be modified, while tuples are used for fixed collection...
- Q2. Basic sql queries
- Q3. Project in detail questions
(5 Questions)
- Q1. String vs Stringbuffer
- Ans.
String is immutable, while StringBuffer is mutable, allowing for dynamic string manipulation without creating new objects.
Strings are immutable: Once created, their values cannot be changed. Example: String str = 'Hello'; str = str + ' World';
StringBuffer is mutable: It allows modification of the string without creating a new object. Example: StringBuffer sb = new StringBuffer('Hello'); sb.append(' World');
Performance:...
- Q2. Explain Collections
- Ans.
Collections in programming are data structures that store groups of related objects, enabling efficient data management and manipulation.
Collections can be categorized into Lists, Sets, and Maps.
Lists (e.g., ArrayList) allow duplicate elements and maintain order.
Sets (e.g., HashSet) do not allow duplicates and are unordered.
Maps (e.g., HashMap) store key-value pairs for efficient data retrieval.
Collections provide meth...
- Q3. What is OOPS and explain
- Ans.
OOP (Object-Oriented Programming) is a programming paradigm based on objects and classes to structure software design.
Encapsulation: Bundling data and methods that operate on the data within one unit (e.g., a class).
Inheritance: Mechanism to create a new class using properties and methods of an existing class (e.g., a 'Dog' class inheriting from an 'Animal' class).
Polymorphism: Ability to present the same interface for...
- Q4. What is Arrays and explain
- Ans.
Arrays are data structures that store multiple values of the same type in a single variable, allowing efficient data management.
Arrays are indexed collections, meaning each element can be accessed using its index. Example: `String[] fruits = {"Apple", "Banana", "Cherry"};`
They have a fixed size, defined at the time of creation. Example: `int[] numbers = new int[5];` creates an array of 5 integers.
Arrays can hold primit...
- Q5. What is hashcode and explain
A challenging session featuring mathematical questions, puzzles, and a game round.
It is quite easy and manageable to solve.
(2 Questions)
- Q1. Coding Question
- Q2. HTML,CSS,Data Structure,OOPS
(2 Questions)
- Q1. How to declare file
- Q2. Difference between Physical file and logical file
Skills evaluated in this interview
I applied via Campus Placement and was interviewed in Sep 2024. There were 3 interview rounds.
General aptitude questions
Basic coding question
(2 Questions)
- Q1. Basics of SQL and cloud
- Q2. Some Python programming question
Interview Preparation Tips
I applied via Campus Placement
(2 Questions)
- Q1. Python Data types
- Q2. What is immutability
Cognizant Interview FAQs
Some of the top questions asked at the Cognizant Software Engineer interview -
The duration of Cognizant Software Engineer interview process can vary, but typically it takes about less than 2 weeks to complete.
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