H&R Block Data Engineer Interview Questions and Answers

Knowing about you, basic introduction

Asking you about the DSA questions

Q1. The moral test technical round
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Q1. What are the technology you have worked on
Ans. 
I have worked on a variety of technologies including Java, Python, SQL, and AWS.
• Java

• Python

• SQL

• AWS
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Q1. Tell me something about SOLID Principle
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SOLID principles are a set of five design principles in object-oriented programming to make software designs more understandable, flexible, and maintainable.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable...read more
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It includes - 2 coding questions + MCQ

Online aptitude test 1.30 hr....................

1 HR CODING test both aptitude coding combines 2.30 hours

Q1. Depends on your branch ..technical questions
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Q1. Easy questions only asked.........................
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It was a very easy aptitude test

It is a very easy coding test

Q1. Asked about AI, ML
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Q2. Asked about self intro, project
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Q1. What is Abstract class
Ans. 
An abstract class is a blueprint for other classes, allowing for shared methods and properties while preventing instantiation.
• An abstract class cannot be instantiated directly.

• It can contain abstract methods (without implementation) that must be implemented by derived classes.

• It can also have concrete methods (with implementation) that can be used by derived classes.

• Example: In a shape hierarchy, 'Shape' can be an abst...read more
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Q2. Difference between static method and class method?
Ans. 
Static methods belong to the class, while class methods can modify class state and take the class as the first argument.
• Static methods are defined using the 'static' keyword and do not take 'self' or 'cls' as the first parameter.

• Class methods are defined using the '@classmethod' decorator and take 'cls' as the first parameter, allowing access to class variables.

• Static methods cannot modify class state or instance state...read more
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Q3. MRO in Python ?
Ans. 
MRO (Method Resolution Order) in Python determines the order in which base classes are searched when executing a method.
• MRO is crucial in multiple inheritance scenarios to avoid ambiguity.

• Python uses the C3 linearization algorithm to compute MRO.

• You can view the MRO of a class using the __mro__ attribute or the mro() method.

• Example: For class D inheriting from B and C, and both B and C inheriting from A, MRO is D ->...read more
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Q4. How merge function used in pandas?
Ans. 
The merge function in pandas combines DataFrames based on common columns or indices.
• Used to combine two DataFrames based on a key column.

• Example: pd.merge(df1, df2, on='key') merges df1 and df2 on the 'key' column.

• Supports different types of joins: inner, outer, left, right.

• Example: pd.merge(df1, df2, how='outer') performs an outer join.

• Can merge on multiple columns using a list: pd.merge(df1, df2, on=['key1', 'key2'])
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Q1. Sql queries, java coding
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