Lumen Technologies Interview Questions, Process, and Tips

Very hard level of Coding for 2 years experience guy.

Q1. Interviewer and HR's both are arrogant and knowledge less persons
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Q1. Waste questions ,even doing well they don't want to take
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Q1. Managerial round,they
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Q1. What are the SOLID principles in Android development?
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SOLID principles are a set of five design principles that help developers create more maintainable and scalable code.
• Single Responsibility Principle (SRP) - A class should have only one reason to change.

• Open/Closed Principle (OCP) - Classes should be open for extension but closed for modification.

• Liskov Substitution Principle (LSP) - Objects of a superclass should be replaceable with objects of its subclasses without a...read more
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Q2. What is the difference between MVVM (Model-View-ViewModel) and MVC (Model-View-Controller) architectural patterns?
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MVVM separates the view and model using a ViewModel, while MVC separates the view and model using a controller.
• In MVVM, the ViewModel acts as an intermediary between the view and model, handling user interactions and updating the model accordingly.

• In MVC, the controller is responsible for handling user input, updating the model, and updating the view.

• MVVM allows for better separation of concerns and easier unit testing...read more
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Q1. What are the key concepts of Object-Oriented Programming (OOP) in Java?
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OOP in Java focuses on objects, classes, inheritance, encapsulation, and polymorphism to create modular and reusable code.
• 1. Classes and Objects: A class is a blueprint for creating objects. Example: 'class Dog { }' creates a Dog object.

• 2. Inheritance: Allows a new class to inherit properties and methods from an existing class. Example: 'class Puppy extends Dog { }'.

• 3. Encapsulation: Bundles data (attributes) and metho...read more
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Q2. What are all the framework design techniques
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Framework design techniques help structure software systems for flexibility, maintainability, and scalability.
• Modular Design: Breaks down the system into smaller, manageable modules (e.g., microservices architecture).

• Layered Architecture: Organizes code into layers (e.g., presentation, business logic, data access).

• Event-Driven Architecture: Uses events to trigger actions (e.g., message queues in distributed systems).

• As...read more
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Q1. HR system knowledge
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Q2. LMS system knowledge
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