Tazapay Senior DBA and Data Engineer Interview Questions and Answers for Freshers

Q1. Tell me something about your self
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Q2. Why should i hire u
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Q1. Minimum 30 word per min typing speed with 95+ accuracy
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Q2. How did i spent your yesterday
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Q1. Normal questions by operation manager
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Q1. Give a brief Introduction
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Q1. Does Java support pass by reference?
Ans. 
Yes
• Java uses pass by value for all variables, including object references.

• When an object reference is passed as an argument, a copy of the reference is passed, not the actual object.

• Modifying the reference inside the method will not affect the original reference outside the method.

• However, modifications to the object's state inside the method will be visible outside the method.
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Q2. Explain Singleton Pattern
Ans. 
Singleton pattern restricts the instantiation of a class to a single object.
• Singleton pattern ensures that only one instance of a class exists throughout the application.

• It provides a global point of access to the instance.

• Commonly used in scenarios where a single instance needs to coordinate actions across the system.

• Example: Database connection manager, logger, configuration manager.
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Q1. Internal Implementation of HashMap
Ans. 
HashMap is implemented using an array of linked lists to handle collisions.
• HashMap stores key-value pairs in an array of linked lists

• Hash function is used to determine the index of the array where the key-value pair will be stored

• Collision handling is done by chaining, where multiple key-value pairs with the same hash value are stored in the same linked list

• HashMap allows null keys and values

• HashMap is not synchronized...read more
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Q1. Basic details, qualification,skills int
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Q2. Last salary and expected
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Q1. How do you think Business analyst?
Ans. 
Business analysts think analytically and strategically to identify business needs and recommend solutions.
• Business analysts analyze data to identify trends and patterns.

• They work closely with stakeholders to gather requirements and understand business processes.

• They use tools such as SWOT analysis, process flow diagrams, and data modeling to recommend solutions.

• Business analysts communicate effectively to bridge the ga...read more
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Q2. Please tell me about your data analyst experience.
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Q3. Do you have any experience on SQL or Python
Ans. 
Yes, I have experience with both SQL and Python.
• I have used SQL to query databases and extract relevant information.

• I have written Python scripts to automate data analysis and reporting tasks.

• I am familiar with using SQLAlchemy in Python for database interactions.

• I have experience with data manipulation and visualization using Python libraries like Pandas and Matplotlib.
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Q1. Data Structure and algorithm
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Q2. System design question
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How to increase personal insurance revenue to 5x?