Wissen Technology Principal Engineer Interview Questions and Answers

Q1. Program to remove the duplicates
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Q1. Spark related performnace tunning quetions
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I was tasked with creating a Spring Boot microservice.

Q1. What are python libraries used as a data engineer?
Ans. 
Python libraries commonly used by data engineers include Pandas, NumPy, Matplotlib, and Scikit-learn.
• Pandas: Used for data manipulation and analysis.

• NumPy: Provides support for large, multi-dimensional arrays and matrices.

• Matplotlib: Used for creating visualizations and plots.

• Scikit-learn: Offers machine learning algorithms and tools for data analysis.
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Q2. What is PySpark
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PySpark is a Python API for Apache Spark, a powerful open-source distributed computing system.
• PySpark allows users to write Spark applications using Python programming language.

• It provides high-level APIs in Python for Spark's functionality, making it easier to work with large datasets.

• PySpark can be used for data processing, machine learning, graph processing, and more.

• Example: PySpark can be used to perform data anal...read more
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Q3. Explain about your project Architecture
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Q1. What is Delta Lake and its benefits
Ans. 
Delta Lake is an open-source storage layer that brings ACID transactions to Apache Spark and big data workloads.
• Provides ACID transactions for big data workloads

• Ensures data reliability and quality by enabling schema enforcement and data versioning

• Supports batch and streaming data processing

• Improves data quality and reliability by enabling schema enforcement and data versioning
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Q2. How will you create a end to end pipelines in Data Factory if my source and target are SQL and ASQL respectively?
Ans. 
Create end to end pipelines in Data Factory with SQL and ASQL as source and target respectively.
• Use Copy Data activity to move data from SQL source to ASQL target

• Define linked services for SQL and ASQL in Data Factory

• Create datasets for SQL and ASQL tables

• Map columns between source and target datasets

• Configure data flow activities for any transformations needed
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Q1. .Net core and Azure
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Q2. Scenario based questions
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Regex and aptitude discussion

Q1. Expectations asked
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Q1. What is volatile how to use gdb what is singleton
Ans. 
Questions on volatile, gdb usage, and singleton pattern.
• Volatile is a keyword in C that tells the compiler not to optimize the variable.

• GDB is a debugger tool used to analyze and debug code during runtime.

• Singleton is a design pattern that restricts the instantiation of a class to one object.

• To use GDB, compile the code with the -g flag, run the executable with gdb, set breakpoints, and use commands like 'next' and 'pr...read more
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Q1. Basic ruby questions
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Q1. Some deep questions in ruby
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Use case was given to solve

Q1. This was client round , asked about coding solution and asked to write specs
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Q1. Basic HR questions
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