LevaData Inc. Software Engineer Interview Questions and Answers

Q1. What is polymorphism?
Ans. 
Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Inheritance allows a child class to override a method from its parent class, exhibiting polymorphic b
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Q2. How abstraction is implemented?
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Abstraction is implemented in software engineering by hiding unnecessary details and exposing only relevant information.
• Abstraction is achieved through the use of abstract classes and interfaces in object-oriented programming.

• It allows developers to focus on the essential aspects of a concept without getting bogged down in implementation details.

• For example, in a car simulation program, the Car class may have abstract ...read more
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Q3. What is the difference between abstraction and Interface?
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Abstraction is hiding the implementation details while Interface is a contract that defines the methods that a class must implement.
• Abstraction focuses on hiding the internal implementation details of a class, allowing the user to only see the necessary details.

• Interface defines a contract that specifies the methods a class must implement, without providing the implementation details.

• Abstraction can be achieved through...read more
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Q1. What is your motivation when you are working on same project alone for long period?
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My motivation when working on a project alone for a long period is the satisfaction of seeing my hard work come to fruition.
• Setting small achievable goals to keep myself motivated

• Taking breaks to avoid burnout and maintain productivity

• Seeking feedback from others to stay motivated and improve my work

• Reminding myself of the end goal and the impact my project will have
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Q1. What is your salary expectation?
Ans. 
My salary expectation is based on my experience, skills, and the market rate for Software Engineers in this region.
• Research the average salary range for Software Engineers in the specific region or industry

• Consider your level of experience, skills, and qualifications when determining your salary expectation

• Be prepared to negotiate based on the company's offer and benefits package
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Q1. All the questions on OOPS, Shell script, linux, c, C++, database
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Q1. Advanced questions on above areas
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Three coding question

Two technical questions based on strings and linked lists.

Write code to return the maximum profit by buying and selling stocks using available money

Q1. Explain OAuth 2.0
Ans. 
OAuth 2.0 is an authorization framework that allows third-party applications to obtain limited access to a user's account.
• OAuth 2.0 is used for delegated authorization, allowing a user to grant access to their resources without sharing their credentials.

• It uses tokens (access token, refresh token) to grant access to resources on behalf of the user.

• OAuth 2.0 is widely used in APIs, social media platforms, and other web ...read more
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Q2. Design URL Shortener
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Design a URL shortener service
• Generate a unique short code for each long URL

• Store the mapping of short code to long URL in a database

• Redirect users from short URL to long URL when accessed

• Consider implementing custom short domains for branding

• Track analytics for shortened URLs for performance monitoring
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Q1. What is Event Loop In NodeJS?
Ans. 
Event Loop in NodeJS is a mechanism that allows NodeJS to perform non-blocking I/O operations by offloading operations to the system kernel.
• Event Loop is responsible for handling asynchronous operations in NodeJS.

• It allows NodeJS to perform multiple operations concurrently without blocking the execution.

• Event Loop continuously checks the event queue for any pending tasks and executes them in a non-blocking manner.

• Examp...read more
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Q2. What is Cluster ?
Ans. 
A cluster is a group of interconnected computers that work together to perform a task or provide a service.
• Clusters are used to improve performance, scalability, and availability of applications.

• They can be categorized into different types such as high availability clusters, load balancing clusters, and parallel processing clusters.

• Examples of clusters include Hadoop clusters for big data processing and Kubernetes clus
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Implement TODO List with ReactJS

Q1. Innerjoin, index, some logical question.
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