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Persistent Systems Senior Data Engineer Interview Questions, Process, and Tips

Updated 27 Sep 2024

Top Persistent Systems Senior Data Engineer Interview Questions and Answers

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Persistent Systems Senior Data Engineer Interview Experiences

2 interviews found

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

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

Round 1 - Technical 

(12 Questions)

  • Q1. Tell me about yourself and Project
  • Ans. 

    I am a Senior Data Engineer with experience in developing data pipelines and optimizing data storage for various projects.

    • Developed data pipelines using Apache Spark for real-time data processing

    • Optimized data storage using technologies like Hadoop and AWS S3

    • Worked on a project to analyze customer behavior and improve marketing strategies

  • Answered by AI
  • Q2. What was you day-to-day job in your project
  • Ans. 

    My day-to-day job in the project involved designing and implementing data pipelines, optimizing data workflows, and collaborating with cross-functional teams.

    • Designing and implementing data pipelines to extract, transform, and load data from various sources

    • Optimizing data workflows to improve efficiency and performance

    • Collaborating with cross-functional teams including data scientists, analysts, and business stakeholde...

  • Answered by AI
  • Q3. Spark Architecture
  • Q4. How DAG handle Fault tolerance?
  • Ans. 

    DAGs handle fault tolerance by rerunning failed tasks and maintaining task dependencies.

    • DAGs rerun failed tasks automatically to ensure completion.

    • DAGs maintain task dependencies to ensure proper sequencing.

    • DAGs can be configured to retry failed tasks a certain number of times before marking them as failed.

  • Answered by AI
  • Q5. What is shuffling? How to Handle Shuffling?
  • Ans. 

    Shuffling is the process of redistributing data across partitions in a distributed computing environment.

    • Shuffling is necessary when data needs to be grouped or aggregated across different partitions.

    • It can be handled efficiently by minimizing the amount of data being shuffled and optimizing the partitioning strategy.

    • Techniques like partitioning, combiners, and reducers can help reduce the amount of shuffling in MapRed

  • Answered by AI
  • Q6. What is the difference between repartition and Coelsce?
  • Ans. 

    Repartition increases or decreases the number of partitions in a DataFrame, while Coalesce only decreases the number of partitions.

    • Repartition can increase or decrease the number of partitions in a DataFrame, leading to a shuffle of data across the cluster.

    • Coalesce only decreases the number of partitions in a DataFrame without performing a full shuffle, making it more efficient than repartition.

    • Repartition is typically...

  • Answered by AI
  • Q7. How do you handle Incremental data?
  • Ans. 

    Incremental data is handled by identifying new data since the last update and merging it with existing data.

    • Identify new data since last update

    • Merge new data with existing data

    • Update data warehouse or database with incremental changes

  • Answered by AI
  • Q8. What is SCD ??
  • Ans. 

    SCD stands for Slowly Changing Dimension, a concept in data warehousing to track changes in data over time.

    • SCD is used to maintain historical data in a data warehouse.

    • There are three types of SCD - Type 1, Type 2, and Type 3.

    • Type 1 SCD overwrites old data with new data.

    • Type 2 SCD creates a new record for each change, preserving history.

    • Type 3 SCD maintains both old and new values in the same record.

    • SCD is important for...

  • Answered by AI
  • Q9. Scenerio based questions related to Spark ?
  • Q10. Two SQL Codes and Two Python codes like reverse a string ?
  • Ans. 

    Reverse a string using SQL and Python codes.

    • In SQL, use the REVERSE function to reverse a string.

    • In Python, use slicing with a step of -1 to reverse a string.

  • Answered by AI
  • Q11. Find top 5 countries with highest population in Spark and SQL
  • Ans. 

    Use Spark and SQL to find the top 5 countries with the highest population.

    • Use Spark to load the data and perform data processing.

    • Use SQL queries to group by country and sum the population.

    • Order the results in descending order and limit to top 5.

    • Example: SELECT country, SUM(population) AS total_population FROM table_name GROUP BY country ORDER BY total_population DESC LIMIT 5

  • Answered by AI
  • Q12. Using two tables find the different records for different joins
  • Ans. 

    To find different records for different joins using two tables

    • Use the SQL query to perform different joins like INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

    • Identify the key columns in both tables to join on

    • Select the columns from both tables and use WHERE clause to filter out the different records

  • Answered by AI
Round 2 - One-on-one 

(7 Questions)

  • Q1. What is a catalyst optimiser? How it works?
  • Ans. 

    A catalyst optimizer is a query optimization tool used in Apache Spark to improve performance by generating an optimal query plan.

    • Catalyst optimizer is a rule-based query optimization framework in Apache Spark.

    • It leverages rules to transform the logical query plan into a more optimized physical plan.

    • The optimizer applies various optimization techniques like predicate pushdown, constant folding, and join reordering.

    • By o...

  • Answered by AI
  • Q2. Tell me about the optimization you used in your project.
  • Ans. 

    Used query optimization techniques to improve performance in database queries.

    • Utilized indexing to speed up search queries.

    • Implemented query caching to reduce redundant database calls.

    • Optimized SQL queries by restructuring joins and subqueries.

    • Utilized database partitioning to improve query performance.

    • Used query profiling tools to identify and optimize slow queries.

  • Answered by AI
  • Q3. Pyspark question related to merging two schemas?
  • Q4. What is the best approach to finding whether the data frame is empty or not?
  • Ans. 

    Use the len() function to check the length of the data frame.

    • Use len() function to get the number of rows in the data frame.

    • If the length is 0, then the data frame is empty.

    • Example: if len(df) == 0: print('Data frame is empty')

  • Answered by AI
  • Q5. Spark Architecture
  • Q6. How do you decide on cores and worker nodes?
  • Ans. 

    Cores and worker nodes are decided based on the workload requirements and scalability needs of the data processing system.

    • Consider the size and complexity of the data being processed

    • Evaluate the processing speed and memory requirements of the tasks

    • Take into account the parallelism and concurrency needed for efficient data processing

    • Monitor the system performance and adjust cores and worker nodes as needed

  • Answered by AI
  • Q7. What happens when we enforce schema ?
  • Ans. 

    Enforcing schema ensures that data conforms to a predefined structure and rules.

    • Ensures data integrity by validating incoming data against predefined schema

    • Helps in maintaining consistency and accuracy of data

    • Prevents data corruption and errors in data processing

    • Can lead to rejection of data that does not adhere to the schema

  • Answered by AI

Interview Preparation Tips

Topics to prepare for Persistent Systems Senior Data Engineer interview:
  • SQL
  • Pyspark
  • Python
  • Spark
  • Database
Interview preparation tips for other job seekers - Be prepared with Spark core concepts and SQL Coding

Skills evaluated in this interview

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

I applied via Naukri.com and was interviewed before Jun 2023. There were 3 interview rounds.

Round 1 - One-on-one 

(2 Questions)

  • Q1. It’s general type of question
  • Q2. Experience n all
Round 2 - Group Discussion 

It’s just reasoning type questions.

Round 3 - Technical 

(2 Questions)

  • Q1. What is ssis? How we use
  • Ans. 

    SSIS stands for SQL Server Integration Services, a tool provided by Microsoft for data integration and workflow applications.

    • SSIS is a platform for building high-performance data integration and workflow solutions.

    • It allows you to create packages that move data from various sources to destinations.

    • SSIS includes a visual design interface for creating, monitoring, and managing data integration processes.

    • You can use SSIS ...

  • Answered by AI
  • Q2. When we use ssis packages? Difference between union merge
  • Ans. 

    SSIS packages are used for ETL processes in SQL Server. Union combines datasets vertically, while merge combines them horizontally.

    • SSIS packages are used for Extract, Transform, Load (ETL) processes in SQL Server.

    • Union in SSIS combines datasets vertically, stacking rows on top of each other.

    • Merge in SSIS combines datasets horizontally, matching rows based on specified columns.

    • Union All in SSIS combines datasets vertica...

  • Answered by AI

Skills evaluated in this interview

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Interview Preparation Tips

Round: Resume Shortlist
Experience: This round they want to know about why do you want to leave your job?
current ctc
expected ctc
how many experience do you have on particular technology?
Tips: this round is simple you have to tell all the details of your profile and if they want this profile candidate they shortlisted you..
they want positive response, so be positive.

I applied via Referral

Interview Questionnaire 

5 Questions

  • Q1. You have knowledge of data structure? Tell me about it
  • Ans. 

    Data structures are a way to organize and store data efficiently.

    • Data structures are used to store and manipulate data in a structured manner.

    • They provide different ways to access and perform operations on the data.

    • Examples include arrays, linked lists, stacks, queues, trees, and graphs.

  • Answered by AI
  • Q2. Tell me something about your major project
  • Ans. 

    Developed a web-based project management tool for tracking tasks and deadlines

    • Used React.js for front-end development

    • Implemented RESTful APIs using Node.js and Express for back-end

    • Utilized MongoDB for database management

    • Incorporated user authentication and authorization features

    • Integrated real-time notifications using Socket.io

  • Answered by AI
  • Q3. What is your name ?
  • Ans. 

    My name is John Smith.

    • Full name is John Smith

    • Common name in English-speaking countries

    • Easy to remember and pronounce

  • Answered by AI
  • Q4. What does my name mean?
  • Ans. 

    The question is unrelated to the medical field and is not a puzzle or riddle.

    • The question is asking about the meaning of the interviewer's name.

    • You can ask the interviewer about the origin or cultural significance of their name.

    • You can also mention that names often have different meanings in different languages or cultures.

  • Answered by AI
  • Q5. What are your strenghts?
  • Ans. 

    My strengths include problem-solving skills, attention to detail, and strong communication abilities.

    • Strong problem-solving skills - I enjoy tackling complex issues and finding creative solutions.

    • Attention to detail - I am meticulous in my work and strive for accuracy in all tasks.

    • Strong communication abilities - I can effectively convey ideas and collaborate with team members.

  • Answered by AI

Interview Preparation Tips

Round: Test
Experience: The written test of hexaware was way more tough than i thought. Basically you will see on other website that hexaware written test is easy but it was not trust me. So talking more about my test there were 4 sections verbal, aptitude, analytical reasoning and technical also. I am a electronics and communication student so there were technical question from my field of study only but for IT and Computer Science there were programming questions. And there is 10 mins of essay writting also.
Tips: Be prepare for anything. Dont judge the written exam will be easy or tough anything can happen and prepare your best.
Duration: 60 minutes
Total Questions: 75

Round: Group Discussion
Experience: Well, i think my group discussion topic was easy but the only problem was that every person is fully aware of that topic so thought process has become very simple. But still somehow i manage to clear this round also.
Tips: Be calm and if you dont know about some topic so wait for few minutes and listen what others are saYing . The HR will only be checking your communication skills.
Duration: 10 mins minutes

Round: Technical Interview
Experience: I am an EC student so there were very basic question of c and data structure programming and from my field he only asked about my project work and keep asking question from it. I guess he was checking my patience.

Round: HR Interview
Experience: The HR round was quite good. The question was really very basic from my family and strengths and weakness. But i dont know why he asked me a question of c programming and he asked me to make a program generally i have never heard that in HR interview, the HR asking you a technical question but anything can happen .
Tips: Keep yourself calm . Keep wide knowledge of your field.

Skills: Basic C/C++, Communication, Ability To Deliver On A Project, Ability To Work In A Team, Ability To Deliver On A Project, Advance Communication, Confidence
College Name: IPS College of Technology & Management
Motivation: Hexaware is globally recognised company plus its an MNC.

Skills evaluated in this interview

Interview Preparation Tips

Round: Group Discussion
Experience: The result were announced just after the session. The basis of selection was confidence & communication skill as usual.
It was mostly a nice & health discussion.
Tips: Talk short & precise.
Use your hands in explanations.
Dont argue just discuss
Duration: 15 min minutes

Round: Technical Interview
Experience: Questions from c programming, database management, c++, data structure were asked. The HR was trying to confuse and showing confidence was important.

Tips: Answer with confidence
Dont say directly NO to a question

Round: HR Interview
Experience: It was all about confidence and your ability to converse.
HR asked me about myself and why did i want to join the firm etc.
He was mostly looking for a positive attitude.
Tips: Keep a smile.
Converse well & again be confident.
Confidence is the key but overconfidence is bad.

General Tips: Keep your cool
Be confident
Have a positive approach
Skill Tips: Prepare well for Interview
Be confident about wat you know.
Skills: Programming, positive attitude, Confidence
College Name: Gandhi Institute Of Engineering And Technology
Motivation: It is a MNC.
Growth will be good
Future scopes are high

Interview Preparation Tips

Round: Resume Shortlist
Experience: A telephonic of technical round basics about C concepts and Embedded C Concepts in order to call for next round .

Interview Preparation Tips

College Name: Vidyalankar Institute Of Technology

Interview Questionnaire 

11 Questions

  • Q1. Hobbies: Drawing. Asked about drawing and pencil shading. Draw in next 5 mins something great to impress me else rejected
  • Q2. Sketch my face
  • Q3. If you are told to do a job of a peon for the company will you?
  • Q4. Remove all the pcs from the lab and keep in other lab RIGHT NOW?
  • Ans. 

    Yes, I can remove all the pcs from the lab and keep them in another lab right now.

    • Ensure all the necessary equipment and tools are available for the move

    • Coordinate with the lab staff to ensure a smooth transition

    • Label and document each PC for easy identification and setup in the new lab

    • Ensure proper packaging and handling to prevent any damage during the move

  • Answered by AI
  • Q5. Impress me with your talents
  • Q6. If a person asks you on a construction site to pick up bricks will you?
  • Q7. How crazy are you?
  • Q8. Show me how crazy are you in next 5 mins?
  • Q9. Write down Fibonacci series and also explain pseudo code for it?
  • Ans. 

    Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones.

    • The first two numbers of the series are always 0 and 1

    • The next number is the sum of the previous two numbers

    • The series goes on infinitely: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...

    • Pseudo code: 1. Initialize variables a=0, b=1, c=0 2. Print a and b 3. Repeat steps 4-6 until desired number of terms 4. c=a+b 5. Pr

  • Answered by AI
  • Q10. Write algorithm for matrix multiplication?
  • Ans. 

    Algorithm for matrix multiplication

    • Create a result matrix with dimensions of the two input matrices

    • Iterate through each row and column of the result matrix

    • For each element in the result matrix, multiply corresponding row in first matrix with corresponding column in second matrix

    • Add the products obtained in the previous step to get the final value for the element

  • Answered by AI
  • Q11. Explain your project and which algorithm you used in it. Why that algorithm?
  • Ans. 

    I worked on a project that involved sentiment analysis of customer reviews using Naive Bayes algorithm.

    • The project involved collecting customer reviews from various sources.

    • Preprocessing the data by removing stop words, stemming, and tokenizing.

    • Used Naive Bayes algorithm for sentiment analysis.

    • The algorithm was chosen because of its simplicity and effectiveness in text classification tasks.

    • The accuracy of the model was

  • Answered by AI

Interview Preparation Tips

Round: HR Interview
Experience: Confused

If they say do you have any questions?
NEVER ASK about your performance in that round.

Round: Technical Interview
Experience: Good
Tips: Interview depends on your basic knowledge

Skills: Presence Of Mind, Technical Skills, Analytical Skills
College Name: Vidyalankar Institute Of Technology
Motivation: Got rejected for TCS aptitude.
Funny Moments: Whole HR interview

Skills evaluated in this interview

Interview Questionnaire 

9 Questions

  • Q1. Talk about your BE project?
  • Ans. 

    Developed a web-based project management system for a construction company.

    • Used PHP and MySQL for backend development

    • Implemented user authentication and authorization

    • Designed a responsive UI using Bootstrap

    • Integrated Google Maps API for location tracking

    • Enabled file uploads and downloads for project documents

  • Answered by AI
  • Q2. If you belong to EXTC, then why IT?
  • Ans. 

    EXTC and IT are not mutually exclusive fields. My knowledge in EXTC complements my skills in IT.

    • My knowledge in EXTC gives me a strong foundation in electronics and communication, which are essential in the IT industry.

    • I have also gained programming skills through my coursework and projects in EXTC.

    • IT is a rapidly growing field with a lot of opportunities, and I believe my skills and knowledge make me a strong candidat...

  • Answered by AI
  • Q3. Are you ok with relocation?
  • Ans. 

    Yes, I am open to relocation for the right opportunity.

    • I am willing to relocate for a position that aligns with my career goals

    • I am excited about the prospect of exploring a new city and culture

    • I am flexible and adaptable to new environments

  • Answered by AI
  • Q4. Which languages are you familiar with?
  • Ans. 

    I am familiar with several programming languages.

    • Java

    • Python

    • C++

    • JavaScript

    • SQL

  • Answered by AI
  • Q5. BE project members and your guide
  • Q6. What/s the diffrencebetween leader and a manager
  • Ans. 

    A leader inspires and motivates while a manager plans and organizes.

    • Leaders focus on the big picture while managers focus on details

    • Leaders lead by example while managers delegate tasks

    • Leaders inspire and motivate while managers enforce rules and policies

    • Leaders are visionaries while managers are implementers

    • Examples of leaders: Steve Jobs, Martin Luther King Jr. Examples of managers: Tim Cook, COO of Apple

  • Answered by AI
  • Q7. Are you okay with relocation?
  • Ans. 

    Yes, I am open to relocation for the right opportunity.

    • I am willing to relocate for the right job opportunity

    • I am open to exploring new places and cultures

    • I understand that relocation may come with challenges, but I am prepared to face them

    • I am excited about the prospect of starting fresh in a new location

  • Answered by AI
  • Q8. What's the name of the person who took your technical interview?
  • Ans. 

    I'm sorry, I don't have that information.

    • N/A

  • Answered by AI
  • Q9. How was the TCS aptitude test?
  • Ans. 

    The TCS aptitude test was challenging but fair.

    • The test covered a wide range of topics including math, logic, and English.

    • The questions were designed to test problem-solving skills and critical thinking.

    • Time management was crucial as there were many questions to answer in a limited time.

    • Overall, the test was a good indicator of one's aptitude for software engineering.

  • Answered by AI

Interview Preparation Tips

Round: Technical Interview
Experience: pretty decent and interactive
Tips: be true, be yourself

General Tips: Do not fake a personality, be original. Avoid an answer if you have to, but , in an affirmative way.
Skills: Ability To Justify, Ability To Be Involved In Hands On Work, Ability To Deal Diplomatically, Ability To Convince
College Name: Vidyalankar Institute Of Technology
Funny Moments: The HR interviewer asked me the name of my tech interviewer.

Interview Questionnaire 

7 Questions

  • Q1. Introduce Yourself
  • Ans. 

    I am a software engineer with 5 years of experience in developing web applications using Java, Spring Boot, and Angular.

    • 5 years of experience in software development

    • Proficient in Java, Spring Boot, and Angular

    • Strong problem-solving skills

  • Answered by AI
  • Q2. About Your Family
  • Q3. About MindTree
  • Q4. Why MindTree?
  • Ans. 

    MindTree's focus on innovation, culture of learning, and diverse opportunities make it an ideal fit for my career growth.

    • Strong focus on innovation and cutting-edge technologies

    • Culture of continuous learning and development

    • Diverse opportunities for growth and career advancement

  • Answered by AI
  • Q5. Plans for Higher Study
  • Ans. 

    I am currently focusing on gaining practical experience in the software engineering field, but I may consider pursuing higher studies in the future.

    • Currently focusing on gaining practical experience in software engineering

    • Open to considering higher studies in the future

    • Higher studies could include a Master's degree in Computer Science or related field

  • Answered by AI
  • Q6. About Relocation
  • Q7. Any Question?

Interview Preparation Tips

Round: Test
Experience: First round was aptitude test organised by our college through AMCAT
It had 4 section –
1. English – 25 questions (25 minutes)
2. Quantitative – 25 questions (35 minutes)
3. Technical – 25 questions (35 minutes)
4. Logical – 24 questions (35 minutes)
Practice previous Amcat papers. Technical was mostly from data structure and algorithm. There were very basic questions from Operating System and SQL. Each section had individual cut off . It was adaptive test so you can not go back to your previous answer.
Tips: If you are good in basics then you can easily score well in AMCAT.There is no negative marking in AMCAT.You have to manage time as some of the questions are lengthy.Follow R.S.Aggarwal book.
Topics to concentrate for Quantative:
· Time and Work
· Pipes and Cisterns
· Problems on Trains
· Boats and Streams
· Calendar and Clocks
· Probability
· Ratios and Percentage
· Number systems

Logical Ability
Analogy Pattern Recognition
Classification Pattern Recognition
Coding Pattern Recognition
Number Series Pattern Recognition
Direction sense, Blood relations, CDL
Puzzles, Logical word sequence
Selection decision table
Data sufficiency
Objective reasoning

English:

Synonyms/Antonyms/Word Meaning (Vocabulary)
Complete the Sentence (Grammar)
Spot error/Correct sentence (Grammar/sentence construction)
Sentence Ordering (Comprehension skills)
Questions based on passage (Comprehension skills)
Duration: 130 minutes
Total Questions: 99

Round: Resume Shortlist
Experience: Eligibility Criteria:

10th and 12th percentage - 65%
Aggregate of 60% in Engineering (BE / B.Tech/MCA only)
Please note the percentage calculation in case of CGPA:
Total marks obtained from in all the subjects from the first to last semester divided by total of maximum marks in all the subjects from first to last semester.
Candidates need to clear all exams before joining & should come with Degree Certificates
At the time of recruitment, Mindtree allow candidates to appear for the selection/interview process if they have less than 2 backlogs
Only Students from circuit branches can take part in the Mindtree selection process (branches mentioned below) :-
Computer Science and Engineering
Electronics
Electronics and Electricals
Electronics & Communication Engineering
Electronics & Instrumentation
Electronics and telecommunication Engineering
Information Science
Information Technology
Instrumentation Engineering
Telecommunication
MCA

Round: Test
Experience: This round is elimination round and your programs will be considered for technical round. There were 2 C/C++/Java programming questions and you need to type the program, compile and submit. Some hints will be on the screen. This test is conducted by Aspiring Minds. You have to focus on basics programming. There were two questions.One question from pattern printing and other one from array/pointer/String.
Tips: Focus on basic programming
Duration: 20 minutes
Total Questions: 2

Round: Technical Interview
Experience: Thorough discussion about the projects. My major work was on Advance Java, so the interviewer kept on grilling me. Questions on the database, challenges faced, control flow were asked. She even asked me about the implementation of my project. The interview ended with some questions on OOPs concepts.
Tips: Prepare both the programs which have been asked in Programming test. You are surely going to face this question. Prepare well with Logics.Apart from that you need to focus on C/Data Structure/DBMS/Basics of Operating System/Basics of OOPS.

C- Pointer/Array/Strings/Structure/Union
Data Structure : Linked List/Stack/Tree/Sorting/Traversal/SEaching

Round: HR Interview
Experience: This was end of d interview, thankfully I was able to answer all of them. I was the first candidate to enter .

I hope all that I shared above could help you in your preparation. Be confident and give your best.
Tips: In HR round, questions are of fixed type. in every Interview So preparee it from Indiabix.

General Tips: Focus on basics. The "basic" is most difficult to cover :D So Prepare well and be Confident
Skill Tips: Confidence is the key in all interview
Skills: Smartness, Ability To Think Of Creative Solutions, Technical Skill, Confidence
College Name: B P Poddar Institute of management and technology
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Persistent Systems Interview FAQs

How many rounds are there in Persistent Systems Senior Data Engineer interview?
Persistent Systems interview process usually has 2-3 rounds. The most common rounds in the Persistent Systems interview process are One-on-one Round, Technical and Group Discussion.
How to prepare for Persistent Systems Senior 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 Persistent Systems. The most common topics and skills that interviewers at Persistent Systems expect are Java, Kafka, Python, HBase and Hadoop.
What are the top questions asked in Persistent Systems Senior Data Engineer interview?

Some of the top questions asked at the Persistent Systems Senior Data Engineer interview -

  1. What is the best approach to finding whether the data frame is empty or n...read more
  2. What is the difference between repartition and Coels...read more
  3. Two SQL Codes and Two Python codes like reverse a strin...read more

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