ALTRAN SOLUTIONS INDIA Senior Software Engineer Interview Questions and Answers

Q1. What are the best and worst solutions for the coding problem "Longest Substring Without Repeating Characters," including a detailed explanation of each solution along with their time and space complexity?
Ans. 
The Longest Substring Without Repeating Characters problem involves finding the length of the longest substring without any repeating characters.
• Best solution: Sliding Window approach with HashSet to track unique characters. Time complexity O(n), space complexity O(min(n, m)) where n is the length of the string and m is the size of the character set.

• Worst solution: Brute force approach checking all substrings for uniqu...read more
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Q1. Questions regarding Redis and cache eviction policies, and how would you implement a low-level design for the Least Recently Used (LRU) cache algorithm?
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Q1. Tell me about yourself?
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Q2. Introduction round about yourself
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Q3. About work experience in past company
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Q1. Explain some Design patterns
Ans. 
Design patterns are reusable solutions to common problems in software design.
• Design patterns help in creating flexible, maintainable, and scalable software.

• Some common design patterns include Singleton, Factory, Observer, Strategy, and Decorator.

• Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Factory pattern creates objects without specifying the exact class of object...read more
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Q2. Explain Delegates , async/ await
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Delegates are type-safe function pointers in C# used for implementing callbacks. async/await is used for asynchronous programming in C#.
• Delegates in C# are similar to function pointers in C or C++. They allow methods to be passed as parameters to other methods.

• Async/await in C# is used for asynchronous programming, allowing methods to run asynchronously without blocking the main thread.

• Delegates can be used with async/
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Q1. What is a interceptor
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An interceptor is a design pattern commonly used in software development to capture and manipulate requests and responses.
• Interceptors can be used for logging, authentication, authorization, caching, error handling, etc.

• In Angular, interceptors can be used to modify HTTP requests before they are sent and responses before they are received.

• In Spring framework, interceptors can be used to intercept client requests and se
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Q2. What is Authentication, how to achieve it
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Authentication is the process of verifying the identity of a user or system.
• Authentication involves confirming the identity of a user through credentials such as passwords, biometrics, or security tokens.

• Common methods of authentication include single-factor authentication (e.g. password) and multi-factor authentication (e.g. password + SMS code).

• Authentication can be achieved through protocols like OAuth, OpenID, SAML...read more
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Q1. Basic Java and react question
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Q1. Little technical and project oriented question
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Basic hacker rank problem

Q1. Asked few questions on react and java
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Q1. Difference between patch and post
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Q2. Api gateway
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Q1. Get minimum from stream. Query based.
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Q2. Minimum number of platforms for trains. Arrival n departure time is given.
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Q1. Java 8, Stream API
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Q2. Dependency Injection in Spring
Ans. 
Dependency Injection in Spring is a design pattern where objects are passed their dependencies rather than creating them internally.
• In Spring, dependencies are injected into a class through constructor injection, setter injection, or field injection.

• This helps in achieving loose coupling between classes and makes the code more testable and maintainable.

• Example: @Autowired annotation in Spring is used for dependency inj
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Q1. My Experience in IT
Ans. 
I have over 8 years of experience in IT, specializing in software development and project management.
• Developed web applications using Java, Spring, and AngularJS

• Led a team of developers in implementing a new CRM system for a large client

• Managed multiple projects simultaneously, ensuring on-time delivery and client satisfaction
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Q1. Java questions and basics of testing
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