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GfK MODE
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GfK MODE Data Engineer Interview Questions, Process, and Tips
GfK MODE Data Engineer Interview Experiences
1 interview found
Anonymous
I applied via Referral and was interviewed in Sep 2024. There were 2 interview rounds.
(2 Questions)
- Q1. What is coalesce
- Ans.
Coalesce is a function used to return the first non-null value in a list of expressions.
Coalesce function is commonly used in SQL to handle null values.
It takes multiple arguments and returns the first non-null value.
Example: COALESCE(column1, column2, 'default') will return the value of column1 if not null, else column2, and if both are null, it will return 'default'.
- Q2. What is repartition
- Ans.
Repartition is the process of redistributing data across partitions in a distributed system.
Repartitioning helps in balancing the workload and improving performance in distributed computing environments.
It involves moving data between partitions based on certain criteria such as key values or hash functions.
Repartitioning can be done in Spark using operations like repartition() or coalesce().
(2 Questions)
- Q1. Non repeatable character
- Ans.
A non repeatable character is a character that appears only once in a given string.
Iterate through the string and count the frequency of each character
Identify the characters that have a frequency of 1
Return the first non repeatable character found
- Q2. Sort list without sort method
- Ans.
Sort list without using sort method
Create a custom sorting function using loops
Compare each element with every other element to determine the correct order
Swap elements based on the comparison results
Skills evaluated in this interview
Top trending discussions
Interview questions from similar companies
I was interviewed in Jul 2017.
Interview Questionnaire
3 Questions
- Q1. Tell me about yourself?
- Ans.
I am a data analyst with a strong background in statistics and programming.
I have a Bachelor's degree in Statistics and have completed several courses in programming languages like Python and SQL.
I have experience working with large datasets and conducting data analysis using statistical techniques.
I am proficient in data visualization tools like Tableau and have created interactive dashboards to present insights.
I hav...
- Q2. Why this company?
- Ans.
I am interested in this company because of its strong reputation in the data analytics industry and its commitment to innovation.
The company has a proven track record of success in the data analytics industry.
It has a strong reputation for delivering high-quality insights and solutions.
The company values innovation and encourages employees to think creatively.
There are opportunities for professional growth and developm...
- Q3. Why do you want to make a career in this field inspite being an engineer?
- Ans.
I am passionate about using data to solve complex problems and make informed decisions.
Data analysis allows me to apply my analytical skills and engineering background to extract valuable insights from data.
I enjoy working with numbers, statistics, and programming, which are all essential skills in the field of data analysis.
Data analysis offers a wide range of opportunities to work on diverse projects and industries, ...
Interview Preparation Tips
Experience: The written test consists of 2 sections. First section is of verbal reasoning which is very easy. And second section consists of data interpretation, quant questions.
Tips: Speed and accuracy are important in this test. Daily practicing of aptitude can get you through the exam.
Duration: 45 minutes
Total Questions: 40
Round: Technical + HR Interview
Experience: After entering the interview room, the first question asked to me was "Walk me through your CV ".After that, I was asked some puzzle questions, one math question and a case study question which was bit difficult. The interviewer was trying to make me stressed by picking one of my strengths and saying that he considers it as my weakness. He was not convinced with whatever I said but in order to overcome above stress be clam and cool. Say what you know without hesitation, be strong, and be yourself. Last but not the least, don't bluff because he will eventually figure it out, even if you bluff say it convincingly.
Tips: Be perfect about what you have written in your CV and just be yourself.
Round: HR Interview
Experience: HR round was very cool . Actually the panel was friendly with me. They asked some common HR questions. That's it about this round.
Tips: Be fluent and develop good communication skills.
College Name: NIT Bhopal
AYUSH KUMAR SINGH
I applied via Campus Placement and was interviewed in Oct 2024. There were 2 interview rounds.
(2 Questions)
- Q1. Maximal rectangal
- Q2. Loop in linked list
- Ans.
Loop in linked list is a situation where a node points to a previous node in the list, creating an infinite loop.
Check for loops using Floyd's cycle detection algorithm
Use two pointers, one moving twice as fast as the other, to detect a loop
If the fast pointer catches up to the slow pointer, there is a loop
(2 Questions)
- Q1. Basic hr question regarding your project and all
- Q2. He was more interested in what is my thinking pattern
Skills evaluated in this interview
Shweta Saini
1. The online test includes questions related to spark and a coding questions.
(2 Questions)
- Q1. Questions related to sql , spark, data structures were asked
- Q2. 1. Questions based on window functions (rank, dense_rank)
(1 Question)
- Q1. Overall discussion of the projects that you have worked on.
Vivek S Sirwal
Basic aptitude questions
(2 Questions)
- Q1. SQL basics questions like joins
- Q2. Pandas basics for data manipulation
Poongodi Vijay
(1 Question)
- Q1. Self intro and technical questions
(1 Question)
- Q1. Its all about statistical analysis
I applied via Campus Placement and was interviewed in Mar 2024. There were 2 interview rounds.
60 minutes 60 questions
(2 Questions)
- Q1. Tell me about yourself
- Q2. Why you want to join this company
Interview Preparation Tips
Kaustubh J Tikotikar
I applied via Referral and was interviewed in Aug 2024. There were 2 interview rounds.
(3 Questions)
- Q1. About SQL basics such as difference between delete and truncate, and some basic definitions.
- Q2. About Python basics such as list, tuple and all.
- Q3. Basic questions about Excel.
(2 Questions)
- Q1. Salary Negotiation
- Q2. About Company Work Culture
Interview Preparation Tips
- SQL
- Python
- Excel
I applied via Approached by Company and was interviewed in Apr 2024. There was 1 interview round.
(3 Questions)
- Q1. Introduce youself
- Ans.
I am a data analyst with a strong background in statistics and data visualization.
Experienced in using tools like SQL, Python, and Tableau for data analysis
Skilled in interpreting and presenting data insights to stakeholders
Strong understanding of statistical methods and data modeling techniques
- Q2. How are you suitable for this role
- Ans.
I have a strong background in data analysis, with experience in utilizing various analytical tools and techniques to derive insights from data.
I have a degree in Statistics and have completed multiple data analysis projects during my academic career.
I am proficient in using programming languages such as Python and R for data analysis.
I have experience in working with SQL databases and extracting data for analysis.
I hav...
- Q3. Explain your projects
- Ans.
I have worked on various projects involving data analysis, visualization, and interpretation.
Developed predictive models using machine learning algorithms
Performed data cleaning and preprocessing to ensure accuracy
Created interactive dashboards for data visualization
Conducted A/B testing to analyze the impact of changes
Collaborated with cross-functional teams to derive insights from data
Selected
I applied via Approached by Company and was interviewed before Aug 2023. There were 3 interview rounds.
1 coding test having a DP question and some spark based questions.
(2 Questions)
- Q1. Fibonacci using DP
- Ans.
Fibonacci using Dynamic Programming
Use an array to store calculated Fibonacci numbers to avoid redundant calculations
Start with base cases of 0 and 1, then iterate to calculate subsequent Fibonacci numbers
Time complexity can be reduced from exponential to linear using DP
- Q2. SQL questions ( ranks and partition)
(1 Question)
- Q1. Design based questions
Skills evaluated in this interview
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