InFynd Data Engineer Intern Interview Questions and Answers

Simple sql and python basic questions was asked.

I was hiring drive. First round was coding test with medium to advanced SQL, data modelling and python questions

Q1. Data model e commerce application
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Q2. Higest nth rank and lowest rank if no of employees less than 2
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If number of employees is less than 2, highest and lowest rank will be the same.
• If there are less than 2 employees, both highest and lowest rank will be the same.

• For example, if there is only 1 employee, their rank will be 1 which is both the highest and lowest rank.
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Q3. Event session data modeling
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Q1. Sql-self join, non equi join, window funtion, consecutive seats, data modeling, stock market maximum profit sql question
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Q1. This was hiring manager round. Detailed discussions on project and previous experience
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Q1. Strength, weakness and why myntra
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Q1. Question on sql and other stuff
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Q1. Question on sql and other stuff
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Q1. Question on sql and queries
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1 hr medium level DSA questions

Q1. DFS in tree Data Structure
Ans. 
DFS (Depth First Search) is a traversal algorithm used in tree data structures to explore as far as possible along each branch before backtracking.
• DFS starts at the root node and explores as far as possible along each branch before backtracking.

• It uses a stack to keep track of nodes to visit next.

• DFS can be implemented recursively or iteratively.

• Example: In a binary tree, DFS would visit the left child of a node before
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Q2. SQL normalisation types and explanation
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SQL normalisation types include 1NF, 2NF, 3NF, BCNF, and 4NF, each with specific rules for eliminating data redundancy.
• 1NF (First Normal Form) - Each column in a table must contain atomic values, and there should be no repeating groups.

• 2NF (Second Normal Form) - Table should be in 1NF and all non-key attributes should be fully functionally dependent on the primary key.

• 3NF (Third Normal Form) - Table should be in 2NF an...read more
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Q1. Preferred Location
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I am open to opportunities in various locations, depending on the job offer and company culture.
• Open to relocation for the right opportunity

• Prefer locations with good work-life balance

• Interested in cities with strong tech communities
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Q2. About the company
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Hackerrank test with medium level DSA and SQL questions

Q1. SQL joins and window functions
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Q2. Big data optimisation techniques
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Big data optimisation techniques involve strategies to improve the performance and efficiency of processing large volumes of data.
• Use of distributed computing frameworks like Hadoop and Spark to process data in parallel

• Implementing data compression techniques to reduce storage requirements

• Utilizing indexing and partitioning to optimize query performance

• Applying data pruning and filtering to reduce unnecessary data proc...read more
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Q3. DSA Medium level
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Q1. Big data Eco system
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Q2. SQL and Python related
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Q1. Managerial round on a specific use case designing
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Q1. 1) What is internal mechanism in spark . 2) tungsten project in spark explanation 3) sql problem to check where last two transaction belongs to particular retail
Ans. 
Questions related to Spark internals, Tungsten project, and SQL problem for retail transactions.
• Spark's internal mechanism includes components like Spark Core, Spark SQL, Spark Streaming, and MLlib.

• Tungsten project in Spark aims to improve the performance of Spark by optimizing memory usage and CPU utilization.

• To solve the SQL problem, we can use a query to filter transactions for a particular retail and then use the '...read more
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Q1. 1) scenario based question like , if a. job is launched with single executor will there be shuffling
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