CGI Group Software Engineer Interview Questions, Process, and Tips

There were 3 coding questions in the test.

Q1. Question was mainly on basic java and OOPs questions.They asked one coding question related to palindrome.
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Q1. Technical round related to role
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Q1. Discussion about project work
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Q1. Basic program in any language, Sql queries using leftjoin. Questions related to python list and dictionary. Constructor in python .
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Round duration - 60 Minutes
Round difficulty - Medium

This round was majorly focused towards some core concepts in Java and OOPS.

Q1. What are the various access specifiers in Java?
Ans. 
Access specifiers in Java control the visibility of classes, methods, and variables.
• There are four access specifiers in Java: public, private, protected, and default.

• Public: accessible from any other class.

• Private: accessible only within the same class.

• Protected: accessible within the same package and subclasses.

• Default: accessible only within the same package.
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Q2. What do you know about the JIT compiler?
Ans. 
JIT compiler stands for Just-In-Time compiler, which compiles code during runtime instead of ahead of time.
• JIT compiler improves performance by compiling code on the fly as it is needed

• It can optimize code based on runtime conditions and platform specifics

• Examples include Java HotSpot VM's JIT compiler and .NET's JIT compiler
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Q3. How many types of memory areas are allocated by the JVM?
Ans. 
JVM allocates 5 types of memory areas: Method Area, Heap, Stack, PC Register, and Native Method Stack.
• Method Area stores class structures and static variables.

• Heap is where objects are allocated.

• Stack holds method-specific data and references.

• PC Register stores the address of the current instruction being executed.

• Native Method Stack is used for native method execution.
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Q4. What is the difference between an abstract class and an interface in OOP?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, fields, and methods, while interface cannot have any implementation.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract classes are used to define a common behavior for subclasses, while interfaces are used to define a contract f...read more
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Q5. What do you mean by data encapsulation?
Ans. 
Data encapsulation is the concept of bundling data and methods that operate on the data into a single unit or class.
• Data encapsulation helps in hiding the internal state of an object and restricting access to it.

• It allows for better control over the data by preventing external code from directly modifying it.

• Encapsulation also promotes code reusability and modularity by grouping related data and functions together.

• Exam...read more
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Round duration - 60 Minutes
Round difficulty - Medium

This round started with some basic questions from Spring Boot and then the interviewer switched to SQL and asked me to execute some questions on SQL followed by some more questions from OOPS and Java Design Pattern.

Q1. 
String Compression Problem Statement
Ninja needs to perform basic string compression. For any character that repeats consecutively more than once, replace the repeated sequence with the character followed...read more
Ans. 
Implement a function to compress a string by replacing consecutive characters with the character followed by the count of repetitions.
• Iterate through the input string and keep track of consecutive characters and their counts

• Replace consecutive characters with the character followed by the count of repetitions if count is greater than 1

• Return the compressed string
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Q2. What is dependency injection?
Ans. 
Dependency injection is a design pattern where components are given their dependencies rather than creating them internally.
• Allows for easier testing by providing mock dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Examples: Constructor injection, Setter injection, Interface injection
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Q3. What are the basic annotations that Spring Boot offers?
Ans. 
Spring Boot offers basic annotations like @RestController, @RequestMapping, @Autowired, @Component, @Service, @Repository.
• @RestController - used to define RESTful web services.

• @RequestMapping - maps web requests to specific handler methods.

• @Autowired - used for automatic dependency injection.

• @Component - marks a Java class as a Spring component.

• @Service - marks a Java class as a Spring service.

• @Repository - marks a Jav
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Q4. What is the purpose of using @ComponentScan in class files?
Ans. 
@ComponentScan is used in class files to enable component scanning for Spring beans.
• Enables Spring to automatically detect and register Spring beans within the specified package(s)

• Reduces the need for manual bean registration in configuration files

• Can be used with basePackages attribute to specify the base package for scanning

• Can also be used with includeFilters and excludeFilters to customize the scanning process
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Q5. What are the types of design patterns in Java?
Ans. 
Design patterns in Java are reusable solutions to common problems encountered in software design.
• Creational Patterns: Singleton, Factory, Builder

• Structural Patterns: Adapter, Decorator, Facade

• Behavioral Patterns: Observer, Strategy, Template Method
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Round duration - 30 Minutes
Round difficulty - Easy

This is a cultural fitment testing round. HR was very frank and asked standard questions. Then we discussed about my
role.

Q1. What is something about you that is not included in your resume?
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Q2. Why should we hire you?
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