Kroll Senior Data Engineer Interview Questions and Answers

Set of questions on english , aptitude , all are at easy level

Sql basics and some query questions

Q1. Why do u want to join zs ; what do u know about zs; where do u see urself after 5 years ; question on real life scenarios ;
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Q2. Question on real life scenarios
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Q1. Salary expectation
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Q2. When can u join
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Q1. Project related discussions
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Q2. Meduim level SQl and DSA
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Q1. This was data modelling round
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Q2. Design a uber data model
Ans. 
Uber data model design for efficient storage and retrieval of ride-related information.
• Create tables for users, drivers, rides, payments, and ratings

• Include attributes like user_id, driver_id, ride_id, payment_id, rating_id, timestamp, location, fare, etc.

• Establish relationships between tables using foreign keys

• Implement indexing for faster query performance
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Three sections are there 1) Aptitude Test 2) SQL 3) DSA

Q1. What is DSA , sorting , difference between array and linked list
Ans. 
DSA stands for Data Structures and Algorithms. Sorting is the process of arranging data in a particular order. Array is a data structure that stores elements of the same data type in contiguous memory locations, while linked list is a data structure that stores elements in nodes with pointers to the next node.
• DSA stands for Data Structures and Algorithms

• Sorting is the process of arranging data in a particular order

• Arra...read more
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Q2. Written a SQL query
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Q1. Coding question like add numbers
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Q2. Experience on your project
Ans. 
I have experience working on various data analysis projects, including market research, customer segmentation, and predictive modeling.
• Developed predictive models to forecast customer behavior and optimize marketing strategies

• Conducted market research to identify trends and opportunities for growth

• Performed customer segmentation analysis to target specific demographics with personalized marketing campaigns
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Maxium sub string and reverse a string

Q1. Basics of power bi and sql
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Q2. What are joins and types of join
Ans. 
Joins are used to combine rows from two or more tables based on a related column between them.
• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• INNER JOIN returns rows when there is at least one match in both tables

• LEFT JOIN returns all rows from the left table and the matched rows from the right table

• RIGHT JOIN returns all rows from the right table and the matched rows from the left table

• FULL JOIN...read more
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Q3. How to add date table in power bi
Ans. 
To add a date table in Power BI, you can create a new table with a list of dates and relationships with other tables.
• Create a new table in Power BI with a list of dates

• Add columns for day, month, year, etc. for additional analysis

• Establish relationships between the date table and other tables in the data model
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Q1. Sql scenario based question on joins
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Q2. Window function questions
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Q3. Performance tuning
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Q4. Power bi dax question
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Q1. How good are you with numbers
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Q1. Vlookup, pivot table, sumif, average, graphs
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Q1. Do you know the role and responsibility of this position
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Q1. .net questions, web api
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Q1. About previous project exp & responsiblities
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Q2. Kubernetes rancher setup on bare metal
Ans. 
Setting up Kubernetes Rancher on bare metal involves installing Rancher server, setting up Kubernetes cluster, and configuring nodes.
• Install Rancher server on a dedicated machine

• Set up a Kubernetes cluster using Rancher UI or CLI

• Add bare metal nodes to the cluster for workload deployment
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Q3. What is High avaibility and how to implement approach
Ans. 
High availability is the ability of a system to remain operational and accessible for a high percentage of time.
• Implement redundancy in critical components

• Use load balancing to distribute traffic evenly

• Automate failover processes

• Monitor system health and performance

• Utilize cloud services for scalability

• Implement disaster recovery plans
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Q4. Monitoring experience and some cross questions
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Q5. CI/CD process in detail with each step
Ans. 
CI/CD process automates the building, testing, and deployment of code changes.
• Continuous Integration (CI) - Developers regularly merge code changes to a shared repository.

• Automated Testing - Code changes are automatically tested to ensure they meet quality standards.

• Continuous Deployment (CD) - Approved code changes are automatically deployed to production.

• Monitoring and Feedback - Continuous monitoring of deployed app...read more
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Q1. Background work experience
Ans. 
I have 5 years of experience working in various IT roles, including system administration and software development.
• Worked as a system administrator managing servers, networks, and security protocols

• Experience in software development using languages like Python, Java, and Ruby

• Implemented CI/CD pipelines using tools like Jenkins and GitLab

• Worked on cloud platforms like AWS and Azure

• Strong troubleshooting and problem-solv
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Q2. Salary expectations
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