Indian Oil Corporation Senior Software Engineer Interview Questions and Answers

Hackerrank coding test

Q1. Questions related to Nodejs and reactjs and system design
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Q1. This is more related to behaviour round with hiring manager.
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Q1. Related to salary expectation
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Based on skillset, focus on coding

Q1. System design, coding, deep dive
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Q1. Behavioral questions to understand culture fit
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Coding test leetcode Medium

SQL query and Dynamic Programming problem.
Math games

Q1. Introduction and project details
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Q1. What is oops, explain them?
Ans. 
Object-oriented programming (OOP) is a programming paradigm that uses objects to represent and manipulate data.
• OOP is based on the concept of classes and objects.

• It allows for encapsulation, inheritance, and polymorphism.

• Encapsulation hides the internal details of an object and provides a public interface.

• Inheritance allows classes to inherit properties and methods from other classes.

• Polymorphism allows objects of diff...read more
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Q2. What is difference between interface and abstract class?
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Interface defines only method signatures while abstract class can have method implementations.
• An interface can be implemented by multiple classes while a class can extend only one abstract class.

• An abstract class can have instance variables while an interface cannot.

• An abstract class can have constructors while an interface cannot.

• An abstract class can provide default implementations for some methods while an interface...read more
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Q3. What is difference between docker and kubernet?
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Docker is a containerization platform while Kubernetes is a container orchestration tool.
• Docker is used to create, deploy, and run applications in containers.

• Kubernetes is used to manage and orchestrate multiple containers in a cluster.

• Docker provides a way to package and distribute applications in a portable manner.

• Kubernetes provides features like automatic scaling, load balancing, and self-healing.

• Docker is a lower-...read more
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Q4. What is event emitter in angular?
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Event emitter is a class in Angular that allows communication between components.
• Event emitter is used to emit custom events in Angular.

• It allows communication between parent and child components.

• It can be used to pass data from child to parent component.

• It is a part of the @angular/core package.

• Example: @Output() eventEmitter = new EventEmitter();
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Q5. What is view encapsulation in angular?
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View encapsulation is a feature in Angular that allows for the creation of isolated components.
• View encapsulation ensures that styles defined in a component do not affect other components.

• There are three types of view encapsulation: Emulated, Native, and None.

• Emulated is the default and uses CSS to emulate shadow DOM.

• Native uses the browser's native shadow DOM implementation.

• None does not provide any view encapsulation
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Q6. How to communicate with components in angular?
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Components in Angular can communicate with each other using @Input, @Output, and services.
• Use @Input to pass data from parent to child component

• Use @Output to emit events from child to parent component

• Use services to share data between components that are not directly related

• Use RxJS subjects to create a shared data stream between components
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Asked Real Time Scenario to create Microservice for Train and Station information. The interviewer asked what are the properties needs to be considered for evaluating service.

Core Java 11 questions: Webservices, Improvement in JVM, Threads

Java 8: Asked to write a program based on Group By Scenario.

The interview lasts around 2 hrs.

Q1. Managerical round: Asked about current project details, The reason to join BH, Scenario based question on LinkedList vs ArrayList
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Q1. It was easy. The HR told about company policies
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Streams related coding questions

Q1. Spring boot, security etc
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Q2. Java multithreading scenarios
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Q3. Scenario based questions on MS side
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Interviewer asked to create a case study on the current project and mention all the technologies involved

Q1. Implement Immutable class
Ans. 
Immutable class is a class whose state cannot be modified after creation.
• Use final keyword to make class immutable

• Make all fields private and final

• Do not provide setter methods

• If mutable objects are used, return a copy instead of original object
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Q2. Solid principles, questions followed by each principle with good and bad examples
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