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Vodafone Idea Data Engineer Interview Questions and Answers

Updated 9 Sep 2022

Vodafone Idea Data Engineer Interview Experiences

1 interview found

I applied via Approached by Company and was interviewed in Aug 2022. There was 1 interview round.

Round 1 - Technical 

(1 Question)

  • Q1. What is the difference between group by and partition by
  • Ans. 

    Group by is used to group rows based on a column, while partition by is used to divide rows into partitions based on a column.

    • Group by is used with aggregate functions to summarize data

    • Partition by is used to perform window functions on each partition separately

    • Group by creates a single result set, while partition by can create multiple result sets

    • Group by is used in SQL, while partition by is used in window functions

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - basic resume related questions. prepare for the skills in the resume

Skills evaluated in this interview

Interview questions from similar companies

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I applied via Naukri.com and was interviewed in Nov 2024. There were 2 interview rounds.

Round 1 - Coding Test 

It was basic coding to test the Python skills like reading data from local and uploading in cloud then some basic dag related questions

Round 2 - Technical 

(4 Questions)

  • Q1. Clustering and partition difference in data warehousing solutions
  • Ans. 

    Clustering involves grouping similar data together, while partitioning involves dividing data into smaller, manageable sections.

    • Clustering is used to group similar data points together based on certain criteria, such as customer segments or product categories.

    • Partitioning involves dividing a large dataset into smaller, more manageable sections for easier data retrieval and processing.

    • Clustering is often used for data a...

  • Answered by AI
  • Q2. What are the different approaches to Optimising SQL
  • Ans. 

    Different approaches to optimizing SQL include indexing, query optimization, and database design.

    • Use indexing to improve query performance

    • Optimize queries by avoiding unnecessary joins and using appropriate functions

    • Design the database schema efficiently to reduce redundancy and improve data retrieval speed

  • Answered by AI
  • Q3. Spark and it’s architecture
  • Q4. Finding the count of Item bought by an customer from Flipkart during a year excluding February
  • Ans. 

    To find the count of items bought by a customer from Flipkart during a year excluding February, you need to aggregate the data and filter out February transactions.

    • Aggregate the data by customer and item purchased

    • Filter out transactions from February

    • Count the number of items bought by each customer

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - If it’s an entry level the basic knowledge plus in-depth understanding of the domine is more tha. Enough
Interview experience
4
Good
Difficulty level
Easy
Process Duration
-
Result
-

I applied via Approached by Company

Round 1 - Coding Test 

Python and SQL Questions (Easy to Medium)

Round 2 - Technical 

(5 Questions)

  • Q1. Project Work Discussion
  • Q2. SQL Coding (Can be with an online compiler)
  • Q3. Python Coding (Can be with an online compiler)
  • Q4. PySpark Coding (All the coding answers have to be submitted to the interviewer)
  • Q5. PySpark Joins, and Databricks, and Vanilla Spark difference
Round 3 - Technical 

(3 Questions)

  • Q1. SQL 2 Questions (Easy to Medium) (Maybe on the compiler)
  • Q2. Python (Easy) (Maybe on compiler)
  • Q3. Scenario-based questions on the project

Interview Preparation Tips

Interview preparation tips for other job seekers - Be prepared with your resume questions and Job Description Tech Stack Questions. Mostly it will be easy.
For Coding be prepared with:
DSA: Easy
SQL: Easy to Medium (Always be prepared with the NULL-based SQL queries and how they behave)
PySpark: Easy (RDD and data frame)
Interview experience
2
Poor
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
No response

I applied via LinkedIn and was interviewed in Jun 2024. There was 1 interview round.

Round 1 - Technical 

(3 Questions)

  • Q1. Sql question related to windows function
  • Q2. Unix basics - find a word in a set of files
  • Ans. 

    Using Unix command 'grep' to find a word in a set of files

    • Use 'grep' command followed by the word you want to search for and the file(s) you want to search in

    • Add the '-r' flag to search recursively in all files in a directory

    • Use '-i' flag for case-insensitive search

    • Example: grep 'hello' file.txt

    • Example: grep -r 'error' /path/to/directory

    • Example: grep -i 'apple' file1.txt file2.txt

  • Answered by AI
  • Q3. Python question related to file system, regex

Interview Preparation Tips

Interview preparation tips for other job seekers - First round was good, interviewer was supportive. They scheduled the second tech round after a week for the next week and then no one joined the call, furthermore the HR stopped answering my call, email or text and ghosted me.

Skills evaluated in this interview

Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-

I applied via Job Portal

Round 1 - Coding Test 

Python data analysis interview

Round 2 - Case Study 

Projects which i worked on

Round 3 - HR 

(2 Questions)

  • Q1. Salary negotation
  • Q2. Projects to work on
Interview experience
5
Excellent
Difficulty level
Hard
Process Duration
More than 8 weeks
Result
Selected Selected

I applied via Referral and was interviewed before Mar 2023. There were 2 interview rounds.

Round 1 - One-on-one 

(1 Question)

  • Q1. Basic questions about previous experience.
Round 2 - Technical 

(2 Questions)

  • Q1. SQL questions Basic
  • Q2. SQL questions advanced
Interview experience
5
Excellent
Difficulty level
Easy
Process Duration
Less than 2 weeks
Result
Selected Selected

I was interviewed before Feb 2023.

Round 1 - Technical 

(1 Question)

  • Q1. Basic questions about SAP and business workflow
Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-

I applied via Campus Placement

Round 1 - Aptitude Test 

Resume short listing

Round 2 - Coding Test 

2 coding questions easy with aptitude questions as well

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

Based on your job description coding questions will be asked in different categories. If you are able to manage time. It is easy to crack

Round 2 - Technical 

(2 Questions)

  • Q1. Optimization techniques in pyspark
  • Ans. 

    Optimization techniques in pyspark involve partitioning, caching, and using efficient transformations.

    • Partitioning data to distribute workload evenly

    • Caching frequently accessed data to avoid recomputation

    • Using efficient transformations like map, filter, and reduce

    • Avoiding unnecessary shuffling of data

  • Answered by AI
  • Q2. Few coding questions. Find the first unique character in string
Round 3 - Technical 

(1 Question)

  • Q1. It is bit difficult for me. Mention your work experience

Skills evaluated in this interview

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Recruitment Consulltant and was interviewed before Feb 2023. There were 2 interview rounds.

Round 1 - Technical 

(2 Questions)

  • Q1. Spark and SQL and previous experience
  • Q2. Scenario based questions
Round 2 - HR 

(1 Question)

  • Q1. Project architect

Vodafone Idea Interview FAQs

How many rounds are there in Vodafone Idea Data Engineer interview?
Vodafone Idea interview process usually has 1 rounds. The most common rounds in the Vodafone Idea interview process are Technical.
How to prepare for Vodafone Idea Data Engineer interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at Vodafone Idea. The most common topics and skills that interviewers at Vodafone Idea expect are Python, SQL, AWS, C++ and Data Analysis.

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Vodafone Idea Data Engineer Salary
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₹6.3 L/yr - ₹22.2 L/yr
29% more than the average Data Engineer Salary in India
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