Mountblue Technologies Software Developer Interview Questions and Answers

Q1. Explain the projects you have worked on
Ans. 
I have worked on various projects including a web application for a retail company, a mobile app for a fitness tracker, and a data analysis tool for a marketing agency.
• Developed a web application for a retail company to manage inventory and sales

• Created a mobile app for a fitness tracker to track workouts and progress

• Built a data analysis tool for a marketing agency to analyze customer behavior and campaign effectivene
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Q2. Authentication mechanism of the project
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The project uses JSON Web Tokens (JWT) for authentication.
• JWT is used to securely transmit information between parties as a JSON object.

• JWTs are signed using a secret (with HMAC algorithm) or a public/private key pair (using RSA or ECDSA).

• JWTs consist of three parts: header, payload, and signature.

• Example: Upon successful login, a JWT is generated and sent to the client for subsequent API requests.
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Logical thinking was important for preparation

Q1. About the field u chose provide with examples
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Q2. Explain about sql
Ans. 
SQL is a programming language used for managing and manipulating relational databases.
• SQL stands for Structured Query Language

• It is used to create, modify, and retrieve data from databases

• SQL is a declarative language, meaning you specify what you want to achieve rather than how to achieve it

• Common SQL commands include SELECT, INSERT, UPDATE, and DELETE

• SQL is used in various database management systems like MySQL, Orac
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Q1. The second round was also on techincal and the deep dicussion on field u chose
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Q1. Tell me about yourself
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Q2. Covered on all aspects and personality
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Q1. Oops related questions
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Q2. How you can handle exceptions in case of inheritance
Ans. 
Exceptions in inheritance can be handled by using try-catch blocks in the derived class.
• Use try-catch blocks in the derived class to catch exceptions thrown by the base class methods.

• Handle exceptions specific to the derived class in the catch block.

• Consider using super() to call the base class constructor within the try block.

• Avoid catching general exceptions unless necessary to maintain code clarity.

• Ensure proper exc...read more
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Q3. Collections questions
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Q4. Live coding based on the answers you give
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Q5. Your current project and how you handled difficulties in that
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Q1. Define SOLID principles
Ans. 
SOLID principles are a set of five design principles for writing maintainable and scalable code.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Classes should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correct...read more
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Q2. How is data binding achieved in WPF. Show with an example
Ans. 
Data binding in WPF allows synchronization of data between UI elements and data sources
• Data binding in WPF can be achieved using the Binding markup extension

• Properties of UI elements can be bound to properties of data objects

• Example: binds the Text property of TextBlock to the Name property of data object
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Q1. What is oops concepts
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Object-oriented programming concepts that help in organizing and structuring code.
• Encapsulation: Bundling data and methods together in a class.

• Inheritance: Creating new classes from existing ones, inheriting their properties and behaviors.

• Polymorphism: Objects of different classes can be treated as objects of a common superclass.

• Abstraction: Hiding complex implementation details and providing simplified interfaces.

• Enca...read more
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Q2. Abstraction polymorphism inheritance encapsulation
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