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Intellimation.ai Interview Experience for Experienced Backend Developer, Aug 2025
Intellimation.ai interview experience Real time questions & tips from candidates to crack your interview

Backend Developer

Intellimation.ai
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1 rounds | 1 Coding problems

Interview preparation journey

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Journey
In my preparation for the Backend Developer role, I focused on strengthening my fundamentals in APIs, databases, authentication, and system design. I worked on projects where I implemented RESTful APIs, integrated databases, and managed user authentication, which helped me connect theory with practical applications. To improve further, I practiced SQL/NoSQL queries, optimized schema design, and explored concepts like scalability, caching, and error handling. Alongside this, I revised my past projects to clearly explain design choices and contributions, and I prepared through coding practice and mock interviews to build confidence for real-world problem-solving.
Preparation
Topics: Node.JS, JavaScript, SQL
Application process
Where: Coding Ninjas Placement Cell
Eligibility: NA, (Salary range: 8-10 LPA)

Interview rounds

01
Round
Easy
Online Coding Interview
Duration
Interview date28 Aug 2025
Coding problem1

1. Java and Spring Core Interview Questions

  1. Explain Java basics and Spring concepts.
  2. Why are Strings immutable in Java?
  3. What is the difference between == and .equals() when comparing objects in Java?
  4. Can you explain the concept of Dependency Injection in Spring?
  5. What are Collections in Java? Which collection would you use to maintain ordered and unique values?
Problem approach
  • Java Basics and Spring Concepts
    • Java is an object-oriented, platform-independent programming language that provides features like portability, robustness, and security. Spring, on the other hand, is a lightweight framework for building Java applications, offering key features such as Dependency Injection (DI), Aspect-Oriented Programming (AOP), and modular development.
  • Why are Strings Immutable in Java?
    • Strings in Java are immutable to ensure security, enable caching, maintain thread-safety, and allow sharing through the String Pool, which optimizes memory usage.
  • Difference Between == and .equals() in Java
    • == checks whether two object references point to the same memory location.
    • .equals() is used to compare the content or value of two objects.
  • Dependency Injection in Spring
    • Dependency Injection (DI) is a design pattern where the Spring framework takes responsibility for creating and injecting object dependencies into classes. This reduces tight coupling and increases flexibility, testability, and maintainability of the application.
  • Collections in Java & Maintaining Ordered Unique Values
    • The Collections framework in Java provides classes and interfaces to store and manipulate groups of objects. To maintain ordered and unique values, LinkedHashSet or TreeSet can be used:
      • LinkedHashSet maintains insertion order.
      • TreeSet maintains natural ordering or a custom comparator order.

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Skill covered: Programming

How do you remove whitespace from the start of a string?

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