CoinSwitch Technical Operations Engineer Interview Questions and Answers for Experienced

Q1. Project overview?
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Q2. Technical programming questions?
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You will get base code from HR and you will be asked to enhance the code with few additional requirements and this will be reviewed in the next One On One discussion.
As part of One On One discussion, you need to explain your thought process and need to add few more enhancements

Q1. This round is mainly on checking your understanding on the projects you have worked on and why the project was implemented in a specific way
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Q1. This was a system design round. You will receive an open ended product requirement. You need to ask questions to refine the requirement and provide the solution
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Q1. This was the Bar Raiser round. Questions were mainly on how you will handle a certain situations in the company
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Q1. How to build an caching layer for iOS Apps
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Building a caching layer for iOS Apps
• Identify the data that needs to be cached

• Choose a caching mechanism (e.g., NSCache, CoreData, SQLite)

• Implement caching logic in the app's data access layer

• Define cache eviction policies to manage memory usage

• Consider using a cache expiration mechanism

• Handle cache invalidation when data changes

• Optimize cache performance by using appropriate data structures
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Q2. How to optimise image rendering for iOS Apps
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Optimizing image rendering for iOS Apps involves techniques like image compression, caching, lazy loading, and using the appropriate image formats.
• Use image compression techniques like JPEG or PNG optimization to reduce file size without compromising quality

• Implement caching mechanisms to store and retrieve images locally, reducing network requests

• Utilize lazy loading to load images only when they are needed, improving...read more
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Q3. Tell me about framework types in iOS
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There are several types of frameworks in iOS, including system frameworks, third-party frameworks, and custom frameworks.
• System frameworks are provided by Apple and include UIKit, Foundation, and Core Data.

• Third-party frameworks are developed by external developers and can be integrated into iOS apps, such as Alamofire and Firebase.

• Custom frameworks are created by developers for specific project needs and can be reused...read more
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Machine Coding Round

Low level design - ATM design

High level design - Uber

Q1. Director of engineering round
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Q2. Motivation to join the company
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Q3. Previous roles and responsibilities held
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There was a take home coding test - application to allot a parking lot.

Q1. Questions around optimisations around parking lot application submitted in round1. Implement more use cases asked on the spot System Design/Scaling related questions
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Q1. Mine was java, so Java technical questions, Java new features Questions around Design patterns Questions on SOLID principles
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Q1. Use case was given for wallet(e.g. pay later wallet) and asked to design basic REST APIs. E.g. User have balance in wallet User makes transaction via the wallet User add money in wallet
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Q1. It was 1 hour round. This was round with Engineering Technical Head. The questions were around willingness to work, long term / short term goals, high level behavioural questions, cross questions to evalua...read more
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Q1. This was HR round, around 20 minutes
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Q1. Have you ever faced OutOfMemoryError? How did you resolve that?
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Q2. How you will load text data into DB systems?
Ans. 
Text data can be loaded into DB systems using various methods such as SQL INSERT statements, bulk loading, or ETL processes.
• Use SQL INSERT statements to insert text data into the database one record at a time.

• For large datasets, consider using bulk loading techniques like BULK INSERT or LOAD DATA INFILE.

• ETL (Extract, Transform, Load) processes can be used to extract text data from different sources, transform it as per...read more
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Q1. What are OOPS concepts
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OOPS concepts refer to Object-Oriented Programming principles like Inheritance, Encapsulation, Polymorphism, and Abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation detail
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Q2. What are solid Concept
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Solid concepts are fundamental principles or ideas that are well-established and widely accepted in a particular field.
• Solid concepts provide a strong foundation for further learning and development.

• They are essential for understanding complex topics and solving problems effectively.

• Examples of solid concepts in software engineering include object-oriented programming, design patterns, and data structures.
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Q3. Write Code for Palindrome String
Ans. 
Code to check if a string is a palindrome or not.
• Iterate through the string from both ends and compare characters.

• Use two pointers, one starting from the beginning and one from the end.

• If characters at both pointers are equal, move both pointers towards the center.

• If characters at any point are not equal, return false.

• If both pointers meet in the middle, return true as the string is a palindrome.
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Q1. Circle process related questions
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Q2. Scripting language questions
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