Pytheos Health Systems Full Stack Developer Interview Questions and Answers

An assignment on scenario is given and was asked to develop it and the time given was flexible.

Q1. Explain about OOPs concepts what are the benefits of them.
Ans. 
OOPs concepts are fundamental principles of object-oriented programming that help in creating modular and reusable code.
• Encapsulation helps in hiding the implementation details of an object and provides a clean interface for interacting with it.

• Inheritance allows creating new classes based on existing ones, reducing code duplication and promoting code reuse.

• Polymorphism enables objects to take on multiple forms, allowi...read more
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Q2. What is Activity? What is Binding?
Ans. 
Activity refers to a single screen with a user interface. Binding is a way to connect data to the UI elements.
• Activity is a component of an Android app that represents a single screen with a user interface.

• Binding is a way to connect data to the UI elements in an Activity.

• Data binding can be done using XML or programmatically.

• Binding can be used to update the UI automatically when the data changes.
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Q3. What is Services?
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Services are modular, reusable components that perform specific tasks and can be accessed by other parts of an application.
• Services are used to separate business logic from the UI layer.

• They can be used to perform tasks such as data retrieval, validation, and manipulation.

• Services can be shared across multiple components and modules.

• Examples include HTTP services for making API calls, authentication services, and loggi...read more
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Q4. What is Recyclerview and how it works internally?
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Recyclerview is a view group that displays a list of scrollable items and reuses views as they scroll off the screen.
• Recyclerview is a more flexible and efficient version of ListView and GridView.

• It uses a LayoutManager to arrange items in a list or grid format.

• It also uses an Adapter to provide data to the views and recycle views as they scroll off the screen.

• Recyclerview can also support animations and item decoratio...read more
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Q5. How you'll get data from backend and how you'll pass the data to the view?
Ans. 
Data can be fetched using APIs and passed to the view using templating engines or front-end frameworks.
• Use AJAX calls to fetch data from the backend APIs

• Parse the data received in JSON format

• Use templating engines like Handlebars or front-end frameworks like React to pass the data to the view

• Render the data dynamically on the view
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Q6. What is MVVM, MVC and MVP and tell the differences between them.
Ans. 
MVVM, MVC, and MVP are design patterns used in software development to separate concerns and improve code maintainability.
• MVC stands for Model-View-Controller and separates the application into three interconnected components. The model represents the data and business logic, the view displays the data to the user, and the controller handles user input and updates the model and view accordingly.

• MVP stands for Model-Vie...read more
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Q1. Just a discussion about salary done in this round.
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