Perficient ETL Tester Interview Questions and Answers

Q1. L1 was scheduled and asked abt ETL basics, some sql queries related to string manipulation
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Q1. After 1st round I was asked to submit resume again and BGV details. Submitted them and Waiting for round 2
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Q1. What is Supervised machine learning? Which algorithm you think you can explain brilliantly? Why we use random forest then normal decision tree
Ans. 
Supervised machine learning is a type of ML where the algorithm learns from labeled data. Random forest is used over normal decision tree for better accuracy and to avoid overfitting.
• Supervised ML learns from labeled data to make predictions on new data

• Random forest is an ensemble learning method that uses multiple decision trees to improve accuracy

• Random forest is preferred over normal decision tree to avoid overfitti...read more
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Q2. Example of case study
Ans. 
Case study on a successful marketing campaign for a new product launch
• Identified target audience and their needs

• Developed a unique selling proposition

• Created a multi-channel marketing plan

• Implemented the plan and tracked results

• Adjusted strategy based on data analysis

• Achieved high sales and positive customer feedback
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Retail case study , company trends salw.. Total sale. Profit charts and reports

General Aptitude( Probability dominats) and objective coding

Moderate levels coding questions Refer hacker rank

Q1. Coding, guesstimate, probability,
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Q1. Generation HR questions refer youtube
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We had questions on aptitude - like upstream, downstream problems, etc.

Q1. Live coding using Python/CPP
Ans. 
Live coding using Python/CPP
• Practice coding challenges on platforms like LeetCode or HackerRank to improve coding skills

• Understand data structures and algorithms to solve coding problems efficiently

• Use online IDEs like Repl.it or CodePen for live coding sessions
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Q1. Questions on SQL
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Q1. 1st round- live python coding 2nd round- technical interview 3rd round - HR discussion
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Probability, coding, coordinate geometry , debugging, predict the output

1 hour test 3 questions , one was on numbers I don't remember much , random people get selected in 3rd round in campus placements

Q1. 1.) factorial code 2.) 2 probability questions 3.) prime factors 4.) any questions?
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DSA Questions, iOS Technical Questions

Q1. Basic IOS Question
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Q1. Leadership Round
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