ACE Infoway Node JS Developer Interview Questions and Answers

Logical reasoning and Aptitude

Functions with Pointers and strings concepts

Q1. Mainly on Pointers and Dynamic Memory Allocation of 2-D Array
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Q2. Structure Padding and Packing
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Q1. What is difference between springboot and spring
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Spring is a framework for building Java applications, while Spring Boot is a tool that simplifies the setup and configuration of Spring applications.
• Spring is a comprehensive framework that provides support for various functionalities like dependency injection, aspect-oriented programming, and more.

• Spring Boot is an opinionated tool that simplifies the setup and configuration of Spring applications by providing default...read more
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Q2. Explaing springboot annotation
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Spring Boot annotations are used to simplify the development process by providing shortcuts for common configurations and functionalities.
• Annotations like @SpringBootApplication, @RestController, @Autowired, @ComponentScan are commonly used in Spring Boot applications.

• Annotations help in reducing boilerplate code and configuring various aspects of the application.

• For example, @SpringBootApplication is used to mark the ...read more
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Q3. How do you use JPA in your project write it
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I use JPA in my project by defining entity classes, annotating them with JPA annotations, creating repositories, and using JPQL queries.
• Define entity classes with @Entity annotation

• Annotate fields with @Column, @Id, @GeneratedValue, etc.

• Create repositories by extending JpaRepository interface

• Use JPQL queries for custom database operations
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Q1. How microservices communicate in your project
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Microservices communicate through REST APIs and messaging queues in our project.
• Microservices communicate with each other using REST APIs for synchronous communication.

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

• Service discovery tools like Eureka or Consul are used to locate and communicate with other microservices.

• Microservices may also use gRPC for communicat
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Q2. Which design pattern used in your last project
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Q1. Asked about all projects
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Q2. Team size and agile methodology
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Q1. Why are you leaving current organization
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Q2. What do you know about Emtec
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Emtec is a global IT consultancy that provides technology solutions and services to help organizations drive digital transformation.
• Provides IT consultancy services

• Specializes in technology solutions

• Helps organizations with digital transformation
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Q1. Everything HTML CSS SQL and core java
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Had a DSA question based on maps, CSS related MCQ and prototype related MCQ

Q1. Solved basic DSA question hashmap
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Q1. What are oops concepts in java, explain real time scenario
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OOPs concepts in Java include inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance allows a subclass to inherit properties and methods from a superclass.

• Polymorphism allows objects to take on multiple forms and behave differently based on their context.

• Encapsulation hides the implementation details of an object and only exposes necessary information.

• Abstraction allows for the creation of abstract class...read more
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Q2. Uses of interface, inheritance
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Interfaces define contracts for behavior, while inheritance allows for code reuse and polymorphism.
• Interfaces allow for loose coupling and abstraction, enabling multiple implementations of the same behavior.

• Inheritance allows for code reuse and extension of existing classes, reducing code duplication.

• Polymorphism allows objects of different classes to be treated as if they were of the same class, simplifying code and i
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Q3. SQL query for join of tables
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SQL query for joining tables
• Use JOIN keyword to combine two or more tables based on a related column

• Specify the columns to be selected using SELECT keyword

• Use ON keyword to specify the condition for joining the tables

• Different types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN
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Q4. Java concepts used in your project
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Used Java concepts such as inheritance, polymorphism, and exception handling in my project.
• Implemented inheritance to create a base class and derived classes with specific functionalities.

• Utilized polymorphism to allow objects of different classes to be treated as if they were of the same class.

• Implemented exception handling to handle errors and prevent program crashes.

• Used interfaces to define a set of methods that a ...read more
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Q5. Overloading vs overriding, practical uses
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Overloading is having multiple methods with the same name but different parameters. Overriding is having a method in a subclass with the same name and parameters as a method in the superclass.
• Overloading is used to provide different ways to call a method with different parameters

• Overriding is used to provide a specific implementation of a method in a subclass

• Overloading is resolved at compile-time while overriding is r...read more
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Q1. Basic java questions
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Q2. Simple code analyze
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Q3. Some questions about architecture
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Filter out certain attributes from the hierarchy like data

Q1. String based questions
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Q1. Career aspirations
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A basic aptitude test consisting of theoretical questions.

Q1. Basic questions in Java,SQL and React
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Q1. Coding questions-Reverse String(World Hello), pattern, prime number
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Q2. Project related questions
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