IBS Software Services Java Full Stack Developer Interview Questions and Answers

Q1. Exception hierarchy
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Q2. Factory vs abstract factory design patterns
Ans. 
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
Ans. 
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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Basic aptitude test with technical and non technical question

Q1. What is event loop
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Q1. Questions from JavaScript, React and Node. 1st round. 2 coding questions on String and Array. Questions on Past employment experiece.
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Q1. Event Loop, SQL queries. 2 coding questions on Array and Strings.
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Q2. JavaScript and Node questions
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Q1. Why Oracle Cerner etc....
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Q1. They ask me to write a code. What is normalization What is Generics
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Q1. Explain Solid Principles
Ans. 
Solid Principles are a set of five design principles for writing clean, maintainable, and scalable code.
• Single Responsibility Principle: A class should have only one reason to change.

• Open/Closed Principle: Classes should be open for extension but closed for modification.

• Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correctness...read more
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Q2. Explain Dependency InJection
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Dependency Injection is a design pattern where the dependencies of an object are provided externally rather than created within the object itself.
• Dependencies are passed to a class or method from the outside, rather than being created internally.

• This helps in achieving loose coupling between classes, making the code more modular and easier to maintain.

• Dependency Injection can be done through constructor injection, sett
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Q1. Explain Entity FrameWork or any Design Pattern
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Entity Framework is an ORM tool that enables developers to work with databases using .NET objects.
• Entity Framework is an Object-Relational Mapping (ORM) tool that allows developers to interact with databases using .NET objects.

• It eliminates the need for writing SQL queries by translating LINQ queries into SQL queries.

• It provides automatic generation of database schema based on the domain model.

• Entity Framework supports...read more
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Q2. Explain Routing in Angular
Ans. 
Routing in Angular is the process of navigating between different components based on the URL.
• Routing allows users to navigate between different parts of an Angular application without reloading the entire page.

• Routes are defined in the app-routing.module.ts file using the RouterModule and Routes classes.

• Each route maps a URL path to a component, which is then displayed when the corresponding URL is accessed.

• Angular us...read more
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Q1. What is your goal
Ans. 
My goal is to continuously improve my skills, contribute to innovative projects, and advance my career in software development.
• Continuous learning and skill improvement

• Contributing to innovative projects

• Advancing career in software development
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Q2. What are your strenght and weaknes
Ans. 
My strength is my problem-solving skills and attention to detail. My weakness is that I can be overly critical of my own work.
• Strength: Strong problem-solving skills - I enjoy tackling complex issues and finding creative solutions.

• Strength: Attention to detail - I am meticulous in my work and strive for perfection.

• Weakness: Overly critical of my own work - I tend to be hard on myself and may spend too much time perfect
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Q1. Project, Oops Concept, Java , which technology u have used ? Framework
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Q2. Framework, Explain Long Polling ,
Ans. 
Long polling is a web technique where the client sends a request to the server and the server holds the connection open until new data is available.
• Long polling is a variation of the traditional polling technique where the client sends a request to the server and the server keeps the connection open until new data is available.

• It is often used in web applications to simulate real-time updates without the need for const...read more
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Q3. GraphQL Vs Rest
Ans. 
GraphQL is a query language for APIs that allows clients to request only the data they need, while REST is an architectural style for designing networked applications.
• GraphQL allows clients to request specific data in a single request, reducing over-fetching and under-fetching of data.

• REST uses multiple endpoints for different resources, leading to multiple requests for related data.

• GraphQL provides a strongly typed sc...read more
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Synonyms,math, opposite words english, reasoning,

Oops, table,star,inverse,array, method overloading, overriding