Xebia Interview Questions, Process, and Tips

Q1. What are Java 8 new features? Which of these have you used?
Ans. 
Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions: Enable functional programming in Java by expressing instances of single-method interfaces (functional interfaces) concisely.

• Functional interfaces: Interfaces with a single abstract method, such as java.util.function.Function or java.util.function.Predicate.

• Streams: Allow for proce...read more
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Q2. Are you aware of Eviction Policy in Cache?
Ans. 
Eviction policy in cache determines which items should be removed when the cache reaches its maximum capacity.
• Eviction policy helps in managing the cache size and ensuring that the most relevant data is retained.

• Common eviction policies include LRU (Least Recently Used), LFU (Least Frequently Used), and FIFO (First In, First Out).

• For example, in LRU policy, the least recently accessed items are removed from the cache w
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Q3. LRU in cache? WAP to demonstrate LRU in Cache.
Ans. 
LRU (Least Recently Used) is a cache eviction policy where the least recently accessed items are removed from the cache when it reaches its capacity.
• LRU cache stores key-value pairs with a maximum capacity. When the cache is full, the least recently used item is evicted to make space for new items.

• Each time a key is accessed in the cache, it is moved to the front of the cache to indicate it was the most recently used i...read more
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Q4. Implement Factory Pattern.
Ans. 
Factory pattern is a creational design pattern that provides an interface for creating objects in a superclass, but allows subclasses to alter the type of objects that will be created.
• Create an interface or abstract class for the factory with a method to create objects

• Create concrete classes that implement the factory interface and return specific types of objects

• Client code uses the factory to create objects without k
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Q5. What are profiles in spring boot?
Ans. 
Profiles in Spring Boot allow you to define different configurations for different environments.
• Profiles are used to customize application behavior based on the environment it is running in.

• You can define profiles in application.properties or application.yml using 'spring.profiles.active' property.

• Common profiles include 'dev', 'test', and 'prod' for development, testing, and production environments.

• You can have differ...read more
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Q6. Which cache have you used? Why is Cache needed
Ans. 
I have used Redis and Memcached. Cache is needed to improve performance by storing frequently accessed data in memory.
• Used Redis for key-value storage and Memcached for object caching

• Cache is needed to reduce database load and improve response time

• Helps in storing frequently accessed data in memory for quick retrieval
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Q7. Have you worked on Kafka? How many partitions did your code have?
Ans. 
Yes, I have worked on Kafka. My code had 10 partitions.
• Yes, I have experience working with Kafka and have implemented code with multiple partitions.

• In one of my projects, I used Kafka with 10 partitions to distribute the workload efficiently.

• Having multiple partitions in Kafka helped in achieving high throughput and scalability for real-time data processing.
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Q1. What is higher order functions
Ans. 
Higher order functions are functions that can take other functions as arguments or return functions as results.
• Higher order functions can accept functions as parameters.

• Higher order functions can return functions as output.

• Examples include map, filter, and reduce functions in JavaScript.
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Q2. What is difference b/t types and interface and there use cases
Ans. 
Types define the structure of data while interfaces define the behavior of classes. Types can be used for defining variables and parameters, while interfaces can be used for defining contracts for classes.
• Types define the structure of data, such as primitive types (int, string) or custom types (class, struct)

• Interfaces define the behavior that a class must implement, without specifying how it should be implemented

• Types...read more
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Q1. Project Management
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Q1. Project Management
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Leetcode easy medium questions.

Q1. SQL queries and Matrix based questions.
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Q2. Resume based questions.
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Binary Tree Implementation with example

Q1. What is hadoop.
Ans. 
Hadoop is an open-source software framework for storing and processing large datasets in a distributed computing environment.
• Hadoop consists of the Hadoop Distributed File System (HDFS) for storage and MapReduce for processing.

• It allows for the distributed processing of large data sets across clusters of computers.

• Hadoop is designed to scale from a single server to thousands of machines, each offering local computation...read more
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Q2. What is hdfs? explain in brief.
Ans. 
HDFS stands for Hadoop Distributed File System, a distributed file system designed to store and manage large amounts of data across multiple machines.
• HDFS is a key component of the Hadoop ecosystem, providing high-throughput access to application data.

• It is designed to be fault-tolerant, scalable, and reliable.

• HDFS divides files into blocks and stores multiple copies of each block across different nodes in a cluster.

• It...read more
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Q1. Tell me about yourself.
Ans. 
I am a passionate Big Data Engineer with a strong background in data analytics and machine learning.
• Experienced in designing and implementing big data solutions using Hadoop, Spark, and other technologies

• Skilled in data processing, ETL pipelines, and data visualization

• Proficient in programming languages such as Python, Java, and SQL

• Strong problem-solving skills and ability to work in a fast-paced environment

• Certified i...read more
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Q2. Current role. details of jobs
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