AutomationEdge Senior Software Engineer Interview Questions and Answers

Medium leetcode question related to dp.

LLD round to create a cache library

Q1. Design Paytm like system
Ans. 
Design a system similar to Paytm for online payments and transactions.
• Implement user authentication and authorization for secure transactions

• Develop a user-friendly interface for easy navigation and transactions

• Integrate various payment options like credit/debit cards, net banking, UPI, and wallets

• Implement a robust backend system to handle transactions and store user data securely
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Q2. Design Url Shortner
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Design a URL shortener service to generate short URLs for long URLs.
• Use a unique identifier for each long URL to generate a short URL.

• Implement a mapping system to map short URLs to long URLs.

• Consider implementing features like custom short URLs, expiration dates, and analytics.

• Ensure the short URLs are unique and not easily guessable.

• Optimize the service for performance and scalability.
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Q1. Basic beaviour question.
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Q2. Design Notification Service.
Ans. 
Design a Notification Service for sending alerts to users.
• Define types of notifications (email, SMS, push notifications)

• Implement a system for users to subscribe/unsubscribe from notifications

• Include a scheduling system for sending notifications at specific times

• Consider implementing a notification history for users to view past alerts
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Q1. Technical questions
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Q1. Technical questions
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Q1. Technical questions
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Q1. Salary expectation
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Q1. Design of some machine
Ans. 
Designing a machine involves creating a detailed plan for its structure, functionality, and operation.
• Consider the purpose of the machine and its intended use

• Identify the key components and their interactions

• Create a schematic or blueprint detailing the layout and connections

• Select appropriate materials and technologies for construction

• Test the machine for functionality and efficiency
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Q1. Multithreading, Spring boot, Singleton scope
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Q1. What is BDD and TDD
Ans. 
BDD stands for Behavior Driven Development and TDD stands for Test Driven Development.
• BDD focuses on the behavior of the system from the user's perspective.

• TDD focuses on writing tests before writing the actual code.

• BDD uses natural language to describe the behavior of the system.

• TDD helps in ensuring that the code meets the requirements and is well-tested.

• Both BDD and TDD help in improving the quality of the software
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Q2. What is JUnit and Mockito
Ans. 
JUnit is a unit testing framework for Java, while Mockito is a mocking framework used for creating mock objects in unit tests.
• JUnit is used for writing and running repeatable automated tests to ensure code behaves as expected.

• Mockito is used to create mock objects to simulate the behavior of real objects in unit tests.

• Both JUnit and Mockito are commonly used in test-driven development (TDD) to ensure code quality and r
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Q3. What is microservices architecture
Ans. 
Microservices architecture is an architectural style that structures an application as a collection of loosely coupled services.
• Each service is self-contained and can be developed, deployed, and scaled independently.

• Services communicate with each other over lightweight protocols like HTTP or messaging queues.

• Microservices allow for flexibility, scalability, and easier maintenance compared to monolithic architectures.

• Ex...read more
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Q4. Why HashSet has default size 16
Ans. 
HashSet default size 16 for performance balance between memory usage and lookup time.
• Default size 16 provides a good balance between memory usage and lookup time.

• Choosing a power of 2 size helps in distributing elements evenly across buckets.

• Resizing the HashSet is expensive, so starting with a larger size reduces the need for resizing.

• Example: If the default size was too small, it would lead to more collisions and deg
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Q5. What is diff between ActiveMQ and RabbitMQ
Ans. 
ActiveMQ is Java-based messaging broker while RabbitMQ is a message broker that implements the Advanced Message Queuing Protocol (AMQP).
• ActiveMQ is written in Java and supports multiple messaging protocols like OpenWire, STOMP, MQTT, and AMQP.

• RabbitMQ is written in Erlang and specifically implements the AMQP protocol.

• ActiveMQ is more feature-rich and has a larger user base, while RabbitMQ is known for its reliability a...read more
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Q6. What are databases are present in Azure DB
Ans. 
Azure DB offers various databases including SQL Database, Cosmos DB, MySQL, PostgreSQL, and MariaDB.
• SQL Database

• Cosmos DB

• MySQL

• PostgreSQL

• MariaDB
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Q7. Diff between HashSet and HashMap
Ans. 
HashSet is a collection of unique elements, while HashMap is a key-value pair collection.
• HashSet does not allow duplicate elements, HashMap allows duplicate keys but not duplicate values.

• HashSet uses Set interface, HashMap uses Map interface.

• Example: HashSet set = new HashSet<>(); HashMap map = new HashMap<>();
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Q8. Internal working of HashMap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap allows null keys and values, and...read more
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Q1. Related to OOPS Concepts.
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Q2. C# basic and high level concept based questions.
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Q1. Sql server based questions
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Q2. C# coding programs
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Q1. Discussion with manager
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Q2. Salary expectations
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Q1. Explain redux thunk
Ans. 
Redux Thunk is a middleware that allows asynchronous actions to be dispatched in Redux.
• Redux Thunk is a middleware that extends the Redux store's abilities.

• It allows actions to return functions instead of plain objects.

• These functions can perform asynchronous operations and dispatch actions when needed.

• Thunk functions have access to the store's dispatch and getState methods.

• Example: dispatching an asynchronous action t
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Q1. React middleware
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