Hitachi Data Engineer Interview Questions and Answers

Q1. What is ETL ?
Ans. 
ETL stands for Extract, Transform, Load. It is a process used to extract data from various sources, transform it into a consistent format, and load it into a target database.
• Extract: Data is extracted from different sources such as databases, files, APIs, etc.

• Transform: Data is cleaned, validated, and transformed into a consistent format suitable for analysis.

• Load: The transformed data is loaded into a target database ...read more
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Q1. How did manage risks during migration of DB
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I managed risks during migration of DB by conducting thorough risk assessments, creating backup plans, and involving key stakeholders.
• Conducted thorough risk assessments to identify potential issues

• Created backup plans to mitigate risks and minimize downtime

• Involved key stakeholders in the migration process to ensure alignment and support
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Focus on logical reasoning, quantitative analysis, and verbal reasoning.

Two questions were given that pertained to arrays and strings. It is advisable to practice more with array and string manipulation.

It was an elimination round, and the assigned topic was ChatGPT. We discussed it for 30 minutes.

Q1. Can you introduce yourself, and what do you know about the company?
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Q2. Data analysis-related questions were asked during the interview
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Q1. Basics of OOP and JavaScript related
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General Aptitude - Time Series, Probability & statistics

Q1. General Interview questions on Operator Overriding , Method Overloading
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Q1. What is polymorphism in OOPS
Ans. 
Polymorphism in OOPS refers to the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Inheritance allows a child class to override a method of its parent class, providing different implem
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Q2. How SQL Performance Can Be Optimized
Ans. 
SQL performance can be optimized by using indexes, optimizing queries, minimizing network round trips, and using proper data types.
• Use indexes on columns frequently used in WHERE clauses to speed up data retrieval.

• Optimize queries by avoiding unnecessary joins, using WHERE clauses effectively, and limiting the number of rows returned.

• Minimize network round trips by batching multiple queries into a single request.

• Use pr...read more
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Q1. Salary Expectation as per Your Role
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My salary expectation as a Senior Software Engineer is based on industry standards, my experience, and the responsibilities of the role.
• Research industry standards for Senior Software Engineer salaries

• Consider my years of experience and expertise in software development

• Factor in the specific responsibilities and requirements of the role

• Negotiate based on the company's budget and benefits package

• Be open to discussing sa
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Q2. How will manage If you see the application is crashed
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I will investigate the root cause, analyze logs, and work on fixing the issue to prevent future crashes.
• Investigate the crash logs to identify the root cause

• Analyze the code to understand the issue

• Implement a fix for the crash

• Test the fix thoroughly before deploying it

• Implement monitoring and alerting to catch similar issues in the future
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MCQ of programming languages - c/c++/Python , basic DS and OS questions

Q1. DS and programming language questions
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Q1. Project level discussion and questions
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