Upstox Senior Android Developer Interview Questions and Answers

1 hr
3 questions Easy - Medium

Q1. Design payment gateway SDK
Ans. 
Designing a payment gateway SDK involves creating a software development kit that allows developers to easily integrate payment processing into their Android applications.
• Define the API methods for processing payments, such as authorize, capture, refund, and void.

• Implement secure communication protocols, such as HTTPS, to ensure data privacy and security.

• Include error handling mechanisms to handle various payment proce...read more
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Singleton, Explain MVVM and what are advantages over MVC

Q1. Explain MVVM in brief
Ans. 
MVVM is a design pattern that separates the UI logic from the business logic in an application.
• Model: Represents the data and business logic of the application

• View: Represents the UI components of the application

• ViewModel: Acts as a mediator between the Model and View, handling the UI logic and data binding

• Encourages separation of concerns and easier unit testing
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Q2. Explain dependency injection
Ans. 
Dependency injection is a design pattern where components are provided with their dependencies rather than creating them internally.
• In dependency injection, the dependencies of a component are injected from the outside.

• This helps in making components more modular, testable, and reusable.

• There are three types of dependency injection - constructor injection, setter injection, and interface injection.
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Q1. Maximum Water trapping
Ans. 
Calculate the maximum amount of water that can be trapped between given bars.
• Use two pointers approach to keep track of the left and right boundaries.

• Calculate the water trapped at each bar and update the maximum water trapped.

• Move the pointers towards each other until they meet.

• Example: Given bars [0,1,0,2,1,0,1,3,2,1,2,1], the maximum water trapped is 6 units.
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Q2. Kth most occuring element in a array
Ans. 
Find the Kth most occurring element in an array of strings.
• Count the frequency of each element in the array.

• Sort the elements based on their frequency.

• Return the Kth element from the sorted list.
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DSA Easy to Medium level questions

Q1. Android fundamentals and basics
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Q2. Coroutines deep dive, past projects deep dive
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Q3. Android memory management and profiling
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Q1. How would I fit in from a large organisation to a small org.
Ans. 
I would bring adaptability, flexibility, and a strong work ethic to seamlessly transition from a large organization to a small one.
• I would be able to quickly adapt to the smaller team size and take on a wider range of responsibilities.

• I would be able to work more closely with team members and have a direct impact on projects.

• I would be able to contribute my experience from a large organization to help streamline proces
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1 hr
3 questions Easy - Medium

Q1. Design payment gateway SDK
Ans. 
Designing a payment gateway SDK involves creating a software development kit that allows developers to easily integrate payment processing into their Android applications.
• Define the API methods for processing payments, such as authorize, capture, refund, and void.

• Implement secure communication protocols, such as HTTPS, to ensure data privacy and security.

• Include error handling mechanisms to handle various payment proce...read more
Answered by AI
Add your answer