EPAM Systems Java Developer Team Lead Interview Questions and Answers

Q1. What are microservices according to you?
Ans. 
Microservices are a software development technique where an application is divided into smaller, independent services that communicate with each other through APIs.
• Microservices are small, independent services that focus on specific business functions.

• Each microservice can be developed, deployed, and scaled independently.

• Microservices communicate with each other through APIs, typically using lightweight protocols like ...read more
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Q2. Explain Microservices Architecture used in your project
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Microservices architecture is a design approach where a single application is composed of small, independent services that communicate with each other.
• Each microservice is responsible for a specific business function or capability

• Microservices communicate with each other through APIs

• Each microservice can be developed, deployed, and scaled independently

• Microservices architecture promotes flexibility, scalability, and re
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Q3. How are 4-5 microservices connected in rest api's? which technique you are using?
Ans. 
Microservices are connected in REST APIs using communication protocols like HTTP, messaging queues, and service discovery.
• Microservices communicate with each other using HTTP requests and responses.

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

• Service discovery tools like Eureka or Consul help in locating and connecting to different microservices.

• API Gateway ca...read more
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Q4. Coding question - 1. Create a immutable class of orders. What happens when two objects are created out of it. 2.Using the immutable orders create a set of orders and how will you sort these out. 3.Given ...read more
Ans. 
Creating immutable class of orders, sorting orders, finding average of lists of integers.
• Create an immutable class Orders with private final fields and no setter methods.

• Override equals() and hashCode() methods to ensure uniqueness of objects.

• Use Collections.unmodifiableSet() to create a set of orders and Collections.sort() to sort them.

• Iterate through the List of List of String of integers, convert to integers, and ca
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Q1. Explain Spring Cloud and how you are using in microservices?
Ans. 
Spring Cloud is a set of tools and frameworks for building cloud-native applications in Java.
• Spring Cloud provides tools for service discovery, load balancing, configuration management, and more in microservices architecture.

• It includes projects like Eureka for service discovery, Ribbon for client-side load balancing, and Config Server for externalized configuration.

• Spring Cloud integrates with Spring Boot to simplify ...read more
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Q2. Explain your deployment build config?
Ans. 
Deployment build config includes settings for deploying the application.
• Use tools like Maven or Gradle to manage dependencies and build the project

• Specify deployment environment configurations in a separate file (e.g. application.properties)

• Define build scripts for tasks like compiling, packaging, and deploying the application

• Leverage CI/CD pipelines for automated builds and deployments
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Q1. Explain your project?
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Q2. Your expectations from the company
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Given a project, you need to create logic for a service using helpers and finally give a aggregate of the final converted price .

Given few java 8 programming functions, you need to convert them to respective java 11 functions

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Q2. Vvvhjjjc hhhjVv hsudjsj hsudjsh hdhdh
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Online coding test with spring boot rest API and a java problem solving.

Q1. Design a REST API
Ans. 
Design a REST API for a backend Java developer
• Define the resources and endpoints

• Use HTTP methods like GET, POST, PUT, DELETE

• Implement authentication and authorization

• Use JSON for data exchange

• Include error handling and status codes
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Q2. Provided a list of string with names. and the result should be with a map of the name as key and number of vovels as value. Use Java stream API only.
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They asked question about myself

Gave codeing in advance java concepts

Q1. What is Springboot
Ans. 
Spring Boot is a framework that simplifies the development of Java applications by providing pre-configured settings and tools.
• Spring Boot eliminates the need for manual configuration by providing defaults for most settings.

• It allows developers to quickly set up and run standalone Spring-based applications.

• Spring Boot includes embedded servers like Tomcat, Jetty, or Undertow for easy deployment.

• It promotes convention o...read more
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Q2. Questions on kafka
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Good coding questions related array and string

1. Basic Java
2. Code Snippet
3. Microservices

Q1. How does api gateway work
Ans. 
API gateway acts as a single entry point for all client requests, routing them to the appropriate microservices.
• API gateway handles authentication and authorization for client requests.

• It can perform load balancing and routing of requests to different microservices.

• API gateway can also handle caching, logging, and monitoring of requests.

• Examples of API gateways include Kong, Apigee, and AWS API Gateway.
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