Upstox Sde1 Interview Questions and Answers

Design dream11. Bonus - how notification will be sent to customer for milestone of a player they have followed at scale.

Two DSA Questions
1. Check whether two strings are anagram or not?
2. Create power function without using Math.pow() library?

Q1. LLD to design whatsapp
Ans. 
Designing WhatsApp involves creating a high-level design for the messaging app, focusing on features like chat, groups, calls, and media sharing.
• Implement chat functionality with real-time messaging using sockets

• Design group chat feature with ability to add/remove members

• Include end-to-end encryption for secure messaging

• Develop voice and video calling functionality

• Allow media sharing such as photos, videos, and documen
Answered by AI
Add your answer
Q2. System design ticket booking system
Ans. 
Design a ticket booking system for efficient and user-friendly experience.
• Use a database to store information about available tickets, users, and bookings

• Implement a user-friendly interface for users to search for and book tickets

• Include features like seat selection, payment processing, and booking confirmation

• Consider scalability and performance to handle a large number of users and bookings
Answered by AI
Add your answer

I was asked two DSA questions and duration was of one hour.
1. Calculate Sum of edges of LinkedList
2. Given a list of numbers, find out all the pythagorean triplets.

This was also a DSA round for 1 hour and expected to solve two problems (Medium)

This was a system design round for one hour

Q1. Explain the last technically challenging topic that you have worked on. The engineering manager is only interested in self boasting. Without even trying to understand the entire problem statement, they try...read more
Add your answer

Q1. Arraylist find duplicate
Ans. 
Find duplicates in an ArrayList of strings.
• Iterate through the ArrayList and use a HashSet to keep track of seen elements.

• If an element is already in the HashSet, it is a duplicate.

• Store the duplicates in a separate ArrayList or print them directly.
Answered by AI
Add your answer

Q1. What is difference between @primary and @Qualifier?
Ans. 
Primary is used to define a primary bean when multiple beans of the same type are present, while Qualifier is used to specify which bean to autowire when multiple beans of the same type are present.
• Primary annotation is used to give a higher preference to a bean when multiple beans of the same type are present in the Spring application context.

• Qualifier annotation is used to specify which bean to autowire when multiple...read more
Answered by AI
Add your answer
Q2. How we can handle fault tolerance in Microservices?
Ans. 
Fault tolerance in Microservices can be achieved through redundancy, graceful degradation, and circuit breakers.
• Implementing redundancy by having multiple instances of each microservice running to handle failures.

• Using graceful degradation to ensure that the system can still function even if certain microservices are unavailable.

• Utilizing circuit breakers to prevent cascading failures by temporarily stopping requests t
Answered by AI
Add your answer
Q3. How to implement spring security?
Ans. 
Implementing Spring Security involves configuring security settings in the Spring application.
• Add Spring Security dependency in pom.xml

• Configure security settings in SecurityConfig class

• Define user roles and permissions

• Use annotations like @EnableWebSecurity and @Secured
Answered by AI
Add your answer
Q4. Explain OAuth 2 implementation?
Ans. 
OAuth 2 is an authorization framework that allows a third-party application to obtain limited access to an HTTP service.
• OAuth 2 is used for delegated access, allowing a user to grant a third-party application access to their resources without sharing their credentials.

• It involves the use of access tokens, which are issued by the authorization server after the user authenticates and authorizes the application.

• OAuth 2 su...read more
Answered by AI
Add your answer

Q1. Memory management in Java ?
Ans. 
Java uses automatic memory management through garbage collection to allocate and deallocate memory.
• Java uses garbage collection to automatically manage memory by deallocating objects that are no longer needed.

• The JVM has a heap where objects are allocated and garbage collection is performed to reclaim memory.

• Java provides the 'finalize()' method for objects to perform cleanup before they are garbage collected.

• Memory le...read more
Answered by AI
Add your answer
Q2. Different types of gc?
Ans. 
Different types of garbage collection algorithms in software development.
• Mark and Sweep: Identifies and removes unreachable objects.

• Generational: Divides objects into different generations based on age.

• Parallel: Uses multiple threads to perform garbage collection concurrently.

• Incremental: Spreads garbage collection work over multiple cycles to reduce pause times.
Answered by AI
Add your answer
Q3. Difference between executors &executorservice?
Ans. 
Executors are a class that provides factory and utility methods for Executor, ExecutorService is an interface that represents an asynchronous execution service.
• Executors class provides factory and utility methods for Executor interface

• ExecutorService is an interface that represents an asynchronous execution service

• ExecutorService extends Executor interface

• ExecutorService provides methods to manage termination and produ...read more
Answered by AI
Add your answer