Volkswagen Group Technology Solution Interview Questions and Answers

Q1. Exception hierarchy
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Q2. Factory vs abstract factory design patterns
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Factory pattern creates objects without exposing the instantiation logic, while Abstract Factory pattern provides an interface for creating families of related objects.
• Factory pattern is a creational design pattern that provides a way to create objects without specifying the exact class of object that will be created.

• Abstract Factory pattern is a creational design pattern that provides an interface for creating familie...read more
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Q3. Design a systems for large millions of users
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Design a scalable system for millions of users
• Use microservices architecture to break down the system into smaller, independent services

• Implement load balancing to distribute traffic evenly across servers

• Utilize caching mechanisms to reduce database load and improve performance

• Use horizontal scaling by adding more servers to handle increased traffic

• Implement monitoring and alerting systems to track system performance a
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Q1. Kafka implemenation in spring boot
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Kafka implementation in Spring Boot allows for easy integration of Kafka messaging system in Java applications.
• Use Spring Kafka to configure Kafka properties in Spring Boot application

• Create Kafka producer and consumer beans to send and receive messages

• Use @KafkaListener annotation to listen for messages on specific topics
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Q2. How Kafka delete messages
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Kafka deletes messages based on retention policies and compaction
• Kafka deletes messages based on retention policies set at topic level

• Messages can also be deleted through log compaction process

• Retention policies can be based on time or size of messages
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Q3. Kafka configuration
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Kafka configuration involves setting up properties like broker, topic, partitions, replication factor, etc.
• Configure Kafka broker properties in server.properties file

• Create topics using kafka-topics.sh script

• Set up partitions and replication factor for fault tolerance

• Adjust consumer and producer configurations as needed
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Q4. Structured vs unstructured logs
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Structured logs have a predefined format for easy parsing, while unstructured logs do not.
• Structured logs are easier to search, filter, and analyze compared to unstructured logs.

• Unstructured logs can be harder to parse and may require more manual effort to extract useful information.

• Examples of structured logs include JSON or CSV format, while unstructured logs may be plain text or free-form messages.
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Q5. How micro services communicate each others
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Microservices communicate through lightweight protocols like HTTP, messaging queues, and RPC.
• Microservices can communicate over HTTP using RESTful APIs.

• Message queues like RabbitMQ or Kafka can be used for asynchronous communication between microservices.

• Remote Procedure Calls (RPC) can be used for synchronous communication between microservices.

• Service discovery mechanisms like Eureka or Consul help microservices loca...read more
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Q1. Salary structure discussion
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Q2. Why choice this company
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I chose this company because of its innovative projects, strong team culture, and opportunities for growth.
• Innovative projects that challenge me to learn and grow

• Strong team culture that fosters collaboration and support

• Opportunities for career growth and advancement
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Q3. Why looking for new opportunities
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Seeking new challenges and growth opportunities in a dynamic environment.
• Looking to expand skill set and knowledge in Java development

• Interested in working on innovative projects and technologies

• Seeking a more collaborative and supportive work culture
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Q1. Git handson, Jenkins terraform kubernetes handson
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Q1. Kubernetes arch scencerio based questions handson
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Q1. Mangergial interview questions such a what process u have in our previous company and what are your strong areas
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Portions covered:- maths, DBMS, OS, programming and verbal ability question

Q1. Explanation about projects in detail.
Ans. 
I have worked on various projects including a web application for a retail company and a mobile app for a fitness tracker.
• Developed a web application using HTML, CSS, and JavaScript for a retail company to manage inventory and sales.

• Created a mobile app using React Native for a fitness tracker to track workouts and calories burned.

• Implemented RESTful APIs for communication between front-end and back-end systems.

• Utilize...read more
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Q2. Basics of SQL and DBMS
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Q1. How to debug in python
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Debugging in Python involves identifying and fixing errors in the code to ensure it runs correctly.
• Use print() statements to check the values of variables at different points in the code

• Utilize the built-in debugger pdb for more complex debugging tasks

• Check for syntax errors, logical errors, and runtime errors

• Use try-except blocks to catch and handle exceptions

• Consider using logging to track the flow of the program and
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Q2. For loop vs while loop. Full explanation, not only points
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For loop is used when the number of iterations is known, while loop is used when the condition is true.
• For loop is used when the number of iterations is known beforehand.

• While loop is used when the condition needs to be checked before each iteration.

• For loop is more concise and easier to read for iterating over a range of values.

• While loop is more flexible as it allows for more complex conditions to be checked.
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Q1. Very basic level data engineering question about project and very basic level sql
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Q2. Basic sql qns asked
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Q3. Basic system for data engineering
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