Cognizant Interview Questions, Process, and Tips

Aptitude test involved with quantative aptitude, logical reasoning and reading comprehensions.

Q1. Tell me your introduction.
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Q2. Tell me about your skills.
Ans. 
I have strong skills in data processing, ETL, data modeling, and programming languages like Python and SQL.
• Proficient in data processing and ETL techniques

• Strong knowledge of data modeling and database design

• Experience with programming languages like Python and SQL

• Familiarity with big data technologies such as Hadoop and Spark
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Q1. Are you ready relocate,?
Ans. 
Yes, I am open to relocating for the right opportunity.
• I am willing to relocate for the right job opportunity.

• I have experience moving for previous roles.

• I am flexible and adaptable to new locations.

• I am excited about the possibility of exploring a new city or country.
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Q2. Document verification
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Q1. What is the difference between coalesce and repartition in data processing?
Ans. 
Coalesce reduces the number of partitions without shuffling data, while repartition reshuffles data to create a specific number of partitions.
• Coalesce is used to reduce the number of partitions without shuffling data

• Repartition is used to increase or decrease the number of partitions by shuffling data

• Coalesce is more efficient when reducing partitions as it avoids shuffling

• Repartition is useful when you need to explici...read more
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Q2. What is the difference between a DataFrame and an RDD (Resilient Distributed Dataset)?
Ans. 
DataFrame is a higher-level abstraction built on top of RDD, providing more structure and optimization capabilities.
• DataFrames are distributed collections of data organized into named columns, similar to tables in a relational database.

• RDDs are lower-level abstractions representing a collection of objects distributed across a cluster, with no inherent structure.

• DataFrames provide optimizations like query optimization a...read more
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Q1. Relevant to your project experience and technology
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Q2. Technical round
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Q3. Job related and project worked based questions
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Q1. Mostly salary discussed
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The aptitude test was hard, with over 70% of people likely to fail. However, by thinking practically and answering seriously, we can pass this round easily. There are 20 questions, but they don't reveal the cut-off marks or our scores. In my opinion, the cut-off may be 15 because I cleared this round and I think I scored 15. This is just my guess, as they didn't tell me my exact score.

Q1. Self introduction
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Q2. Strength and weakness
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