Junior Developer

70+ Junior Developer Interview Questions and Answers

Updated 4 Jul 2025
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2d ago

Q. If a client website is experiencing issues and losing money, would you stop working at the end of your shift, or would you continue working until the problem is resolved?

Ans.

I am dedicated and committed to solving the problem, even if it means staying up all night to ensure the client's website is back on track.

  • I am committed to providing the best service to the client, even if it requires working extra hours.

  • I understand the urgency of the situation and will prioritize resolving the issue to prevent further financial loss for the client.

  • I believe in going above and beyond to ensure client satisfaction and maintain a good reputation for the compa...read more

Asked in Syngenta

6d ago

Q. Why are you shifting from electronics and telecommunications to software?

Ans.

I am shifting to software because of my passion for coding and the potential for growth in the industry.

  • Passionate about coding and software development

  • Believe software industry has more potential for growth

  • Enjoy problem-solving and creating solutions through software

  • Interested in exploring new technologies and advancements in software

Junior Developer Interview Questions and Answers for Freshers

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Asked in ICRA

2d ago

Q. Difference between truncate delete Ddl dml commands Primary key unique key defination difference Composite key Foreign key Code to link two tables Sql-foreign key Print name and marks of stu with max marks Oops...

read more
Ans.

The question covers various topics related to database management, SQL, and object-oriented programming concepts.

  • Truncate is a DDL command used to delete all records from a table, while delete is a DML command used to remove specific records.

  • Primary key uniquely identifies each record in a table, while a unique key ensures that all values in a column are unique.

  • Composite key is a combination of multiple columns that uniquely identify a record in a table.

  • Foreign key establishe...read more

Asked in Syngenta

2d ago

Q. Given an unsorted array, find the first repeating number.

Ans.

Find the first repeating number from an unsorted array.

  • Iterate through the array and keep track of seen numbers using a hash set.

  • If a number is already in the set, it is the first repeating number.

  • Return the first repeating number or -1 if no repeating number is found.

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5d ago

Q. Given a string, find the number of unique characters in the string. All characters are in lower case.

Ans.

The task is to find the number of unique characters in a given string.

  • Create an empty array to store unique characters.

  • Iterate through each character in the string.

  • If the character is not already present in the array, add it.

  • Finally, return the length of the array as the number of unique characters.

Asked in Syngenta

5d ago

Q. How do callback functions work in JavaScript?

Ans.

Callback functions are functions passed as arguments to other functions and executed later when the parent function is called.

  • Callback functions are used for asynchronous programming.

  • They are commonly used in event listeners and AJAX requests.

  • Callback functions can be anonymous or named functions.

  • They can also be used to pass data between functions.

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Q. What is the code to determine whether a number is even or odd?

Ans.

To determine if a number is even or odd, check the remainder when divided by 2.

  • Use the modulus operator (%) to find the remainder.

  • If number % 2 == 0, the number is even.

  • If number % 2 != 0, the number is odd.

  • Example: 4 % 2 == 0 (even), 5 % 2 != 0 (odd).

Asked in Rubico

6d ago

Q. What is your experience in web development?

Ans.

I have 2 years of experience in web development, working with HTML, CSS, JavaScript, and various frameworks.

  • 2 years of experience in web development

  • Proficient in HTML, CSS, and JavaScript

  • Familiar with various frameworks like React and Angular

  • Developed responsive and interactive websites

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5d ago

Q. What is the difference between == and .equals() in Java?

Ans.

In Java, '==' checks for reference equality, while '.equals()' checks for value equality between objects.

  • Reference Equality: '==' compares the memory addresses of two objects. Example: 'String a = new String("test"); String b = new String("test");' a == b returns false.

  • Value Equality: '.equals()' compares the actual content of the objects. Example: 'a.equals(b)' returns true in the above case.

  • Primitive Types: '==' can be used with primitive types (int, char, etc.) to compare ...read more

Asked in Syngenta

3d ago

Q. What are the latest features of JavaScript ES6?

Ans.

ES6 introduced several new features to JavaScript including let and const, arrow functions, classes, and template literals.

  • let and const for block-scoped variables

  • arrow functions for concise syntax and lexical this

  • classes for object-oriented programming

  • template literals for string interpolation and multiline strings

  • destructuring for easily extracting values from arrays and objects

  • default parameters for function arguments

  • rest parameters for variable-length argument lists

  • spread...read more

Q. Tell us about your background and any programming languages you've worked with.

Ans.

I have a background in computer science with experience in various programming languages including Python, Java, and JavaScript.

  • Completed a Bachelor's degree in Computer Science, where I learned foundational programming concepts.

  • Worked on a project using Python to develop a web scraper that collects data from multiple websites.

  • Gained experience in Java through building a simple Android application for tracking personal expenses.

  • Utilized JavaScript and React to create a respon...read more

Q. Which coding language is your favorite and why?

Ans.

My favorite coding language is Python because of its simplicity and versatility.

  • Python has a simple syntax which makes it easy to learn and use.

  • It is a versatile language that can be used for web development, data analysis, machine learning, and more.

  • Python has a large and supportive community with a vast number of libraries and frameworks available.

  • It is also cross-platform, meaning that code written on one operating system can be easily run on another.

  • Python is constantly e...read more

Asked in Infosys

1d ago

Q. What are the key concepts of Object-Oriented Programming (OOP)?

Ans.

OOP is a programming paradigm based on objects that encapsulate data and behavior, promoting code reusability and organization.

  • Encapsulation: Bundling data and methods that operate on the data within one unit (e.g., a class).

  • Inheritance: Mechanism to create a new class from an existing class, inheriting its properties (e.g., a 'Dog' class inheriting from an 'Animal' class).

  • Polymorphism: Ability to present the same interface for different data types (e.g., a function that can ...read more

3d ago

Q. What do you know about frameworks?

Ans.

A framework is a pre-written code that provides a structure for building software applications.

  • A framework provides a set of rules and guidelines for developers to follow

  • It includes pre-written code for common tasks, such as handling user input or database interactions

  • Frameworks can be specific to a programming language or platform, such as React for JavaScript or Django for Python

  • Examples of popular frameworks include Angular, Laravel, and Ruby on Rails

Asked in Zibtek

5d ago

Q. What is the difference between a regular function and an arrow function?

Ans.

Regular functions are defined using the function keyword, while arrow functions use the => syntax.

  • Arrow functions have a shorter syntax than regular functions.

  • Arrow functions do not have their own 'this' keyword.

  • Arrow functions cannot be used as constructors.

  • Regular functions can be used as methods on objects, while arrow functions cannot.

  • Arrow functions are always anonymous, while regular functions can be named or anonymous.

Asked in Zivaka

4d ago

Q. Why do we use separate service providers in Flutter?

Ans.

Separate service providers in Flutter help to decouple the business logic from the UI layer, making the code more modular and maintainable.

  • Separate service providers help in following the single responsibility principle by separating the UI logic from the business logic.

  • They make the code more modular and easier to maintain by allowing for easier testing and reusability of code.

  • Service providers can be used to handle network requests, database operations, and other business l...read more

Asked in Motadata

2d ago

Q. How does a hash function work in Java?

Ans.

Hash functions in Java are used to convert an input into a fixed-size string of bytes, typically for data retrieval and security purposes.

  • Hash functions take an input (or 'key') and return a fixed-size string of bytes, known as the hash value.

  • In Java, the hashCode() method is commonly used to generate hash codes for objects.

  • Hash functions are used in data structures like HashMap to efficiently store and retrieve key-value pairs.

Q. How do you approach debugging a program or code?

Ans.

I systematically identify and resolve issues in code through a structured debugging process.

  • Reproduce the issue: Ensure the bug can be consistently replicated.

  • Check error messages: Analyze any error messages or logs for clues.

  • Use debugging tools: Utilize tools like breakpoints and step-through debugging to inspect code execution.

  • Isolate the problem: Narrow down the code to the smallest section that causes the issue.

  • Review recent changes: Look at recent code changes that might...read more

Asked in GwayERP

3d ago

Q. Can you explain inheritance with an example?

Ans.

Inheritance is a fundamental concept in object-oriented programming that allows a class to inherit properties and methods from another class.

  • Base Class: The class from which properties and methods are inherited is called the base class or parent class. Example: class Animal.

  • Derived Class: The class that inherits from the base class is called the derived class or child class. Example: class Dog extends Animal.

  • Method Overriding: A derived class can provide a specific implementa...read more

Q. What is the process for identifying prime numbers?

Ans.

Identifying prime numbers involves checking if a number has only two distinct positive divisors: 1 and itself.

  • A prime number is greater than 1 and has no divisors other than 1 and itself.

  • To check if a number n is prime, test divisibility from 2 to √n.

  • For example, 7 is prime (divisors: 1, 7), while 8 is not (divisors: 1, 2, 4, 8).

  • Special cases: 2 is the only even prime number; all other even numbers are not prime.

Q. Which algorithm is efficient and why?

Ans.

The binary search algorithm is efficient because it has a time complexity of O(log n).

  • Binary search is efficient for searching in a sorted array or list.

  • It works by repeatedly dividing the search interval in half.

  • Examples include searching for a word in a dictionary or finding a number in a phone book.

Asked in Saneforce

2d ago

Q. footer in html,Anger tag Details and Css Syntax and types

Ans.

Footer in HTML is used to display information at the bottom of a webpage. Anchor tag is used to create hyperlinks. CSS syntax includes selectors, properties, and values.

  • Footer in HTML is created using the <footer> tag.

  • Anchor tag <a> is used to create hyperlinks in HTML.

  • CSS syntax includes selectors (e.g. class, id), properties (e.g. color, font-size), and values (e.g. red, 16px).

Asked in Infosys

4d ago

Q. What is the difference between a stack and a queue?

Ans.

Stack is Last In First Out (LIFO) data structure, while Queue is First In First Out (FIFO) data structure.

  • Stack follows LIFO principle, where the last element added is the first one to be removed.

  • Queue follows FIFO principle, where the first element added is the first one to be removed.

  • Stack operations include push (add element) and pop (remove element).

  • Queue operations include enqueue (add element) and dequeue (remove element).

5d ago

Q. Can you code face recognition?

Ans.

Yes, I have experience coding for face recognition using OpenCV and Python.

  • I have worked on projects involving face detection, recognition, and tracking.

  • I am familiar with OpenCV libraries and have used them to implement face recognition algorithms.

  • I have experience with Python programming language and its libraries for image processing.

  • I have also worked with deep learning frameworks like TensorFlow and Keras for face recognition tasks.

6d ago

Q. Do you know python and Ai and Ml

Ans.

Yes, I have experience in Python, AI, and ML.

  • I have worked on various projects using Python for data analysis and automation.

  • I have also implemented machine learning algorithms using libraries like scikit-learn and TensorFlow.

  • I have experience in natural language processing and computer vision using AI techniques.

  • I have worked on projects like sentiment analysis, image classification, and recommendation systems.

Asked in Zivaka

3d ago

Q. What is feature branching in GitHub?

Ans.

Feature branching in Github is a practice of creating a separate branch for each new feature or task to isolate changes.

  • Feature branching helps in keeping the main branch clean and stable.

  • Developers can work on different features simultaneously without interfering with each other's code.

  • Once the feature is complete, it can be merged back into the main branch through a pull request.

  • Example: Creating a 'login-feature' branch to work on implementing a new login functionality.

1d ago

Q. What is Node.js and why do we use it?

Ans.

Node.js is a runtime environment that allows you to run JavaScript on the server side.

  • Node.js is built on Chrome's V8 JavaScript engine.

  • It is used for building scalable network applications.

  • Node.js uses an event-driven, non-blocking I/O model.

  • It is commonly used for building web servers and APIs.

  • Example: Creating a simple web server using Node.js.

Asked in Conduent

6d ago

Q. What are the OOPS concepts in C#?

Ans.

Object-oriented programming concepts in C#

  • Encapsulation: bundling data and methods into a single unit

  • Inheritance: creating new classes from existing ones

  • Polymorphism: using a single interface to represent different types

  • Abstraction: hiding unnecessary details and exposing only essential features

  • Example: Creating a class 'Car' with properties like 'color' and methods like 'startEngine'

  • Example: Inheriting from a base class 'Animal' to create derived classes like 'Dog' and 'Cat'

Asked in GwayERP

1d ago

Q. How do you implement a stack or queue?

Ans.

A stack is a LIFO data structure, while a queue is a FIFO structure, both used for managing collections of items.

  • Stack Implementation: Use an array or linked list to store elements. Example: Push and pop operations manage the stack's top element.

  • Queue Implementation: Use an array or linked list to store elements. Example: Enqueue adds to the back, dequeue removes from the front.

  • Stack Operations: Push (add), Pop (remove), Peek (view top element). Example: Push(1), Push(2), Pop...read more

1d ago

Q. Object Oriented Programming Concepts - with example - difference

Ans.

Object Oriented Programming Concepts involve encapsulation, inheritance, and polymorphism.

  • Encapsulation: Bundling data and methods that operate on the data into a single unit (class). Example: class Car with properties like make, model, and methods like start(), stop().

  • Inheritance: Allows a class to inherit properties and methods from another class. Example: class SUV extends Car, inheriting properties and methods from the Car class.

  • Polymorphism: Ability of objects to take on...read more

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