NASDAQ Data Engineer Interview Questions and Answers

Q1. What is dependency injection
Ans. 
Dependency injection is a design pattern in which components are given their dependencies rather than creating them internally.
• Dependency injection helps in achieving loose coupling between classes.

• It allows for easier testing by providing mock dependencies.

• There are three types of dependency injection: constructor injection, setter injection, and interface injection.
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Q2. What is state in react
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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. Life cycle of thread
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Thread life cycle includes new, runnable, running, blocked, and terminated states.
• Thread is created in 'new' state

• It becomes 'runnable' when start() method is called

• Thread enters 'running' state when CPU starts executing its run() method

• It can go to 'blocked' state if it's waiting for a resource

• Finally, thread reaches 'terminated' state when run() method completes or stop() method is called
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Q2. İnternal working of hash map
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Hash map is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.
• Hash map consists of an array of buckets, each containing a linked list of key-value pairs.

• When inserting a key-value pair, the hash function is used to determine the index of the bucket where the pair should be stored.

• To retrieve a value, the hash function is used to find the corresponding bucket...read more
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Q1. Salary expectations
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Q2. Why I want to change the job
Ans. 
Seeking new challenges, growth opportunities, and a better work-life balance.
• Looking for new challenges and opportunities to learn and grow

• Seeking a better work-life balance

• Interested in working with new technologies or in a different industry

• Wanting to advance career progression
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In the aptitude test has 40 questions and give a answer in a proper manner l.

Q1. Myself introduction
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Q2. What is past experience in working in last organisation
Ans. 
I have 2 years of experience working as a Data Entry Operator in my last organization.
• Entered and updated data into computer systems

• Verified accuracy of data entered

• Maintained confidentiality of sensitive information

• Assisted in organizing and maintaining files and records
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Quantitative interview

Java coding and c language

Q1. C language question
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Q2. Java language question
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Q1. Why data analysis and data science
Ans. 
Data analysis and data science are crucial for extracting valuable insights from large datasets to drive informed decision-making.
• Data analysis and data science help in uncovering patterns and trends within data.

• They enable businesses to make data-driven decisions for improved efficiency and effectiveness.

• These fields also play a vital role in predictive analytics and forecasting.

• Examples include using machine learning...read more
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Q2. Why pgdm in business analytics
Ans. 
PGDM in Business Analytics provides specialized knowledge and skills for analyzing data to drive business decisions.
• Specialized curriculum focusing on data analysis techniques and tools

• Hands-on experience with real-world data sets

• Opportunities for networking with industry professionals

• Career advancement in the field of business analytics
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3 programs to write in arrays linked lists and trees

Q1. Was asked questions on core Java, spring framework, apis and micro services
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Q1. What expertise will you bring to cme group of you join?
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Q2. Why are you quitting your current company?
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Q1. RestAPIs and Webservices
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Q2. Microservices and Spring boot
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Q1. Simple question not very hard related to java
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