CME Group Senior QA Engineer Interview Questions and Answers

Q1. Simple question not very hard related to java
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Any online ideas, ds-algo, medium level

Swift, security framework, api, memory management

Q1. Basic ds-algo nd technical question
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Q1. Managerial question
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Q1. What is dependency injection
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Q2. What is state in react
Ans. 
State in React is a JavaScript object that stores data and determines how a component renders and behaves.
• State is mutable and can be updated using the setState() method

• State should be used for data that will change over time and affect the component's rendering

• State should not be modified directly, use setState() instead
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Q1. Have you ever faced OutOfMemoryError? How did you resolve that?
Ans. 
Yes, I've encountered OutOfMemoryError and resolved it through various strategies like optimizing memory usage and increasing heap size.
• Identified memory leaks using profiling tools like VisualVM or YourKit.

• Optimized data structures, e.g., using ArrayList instead of LinkedList for better memory efficiency.

• Increased JVM heap size with -Xmx option based on application needs.

• Implemented caching strategies to reduce memory...read more
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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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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
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Q1. Circle process related questions
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Q2. Scripting language 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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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
Ans. 
Design REST APIs for a pay later wallet system with user balance, transactions, and fund additions.
• GET /wallet/{userId} - Retrieve the user's wallet balance.

• POST /wallet/{userId}/transaction - Create a new transaction using wallet balance.

• POST /wallet/{userId}/add-funds - Add money to the user's 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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