Northcorp Software Springboot Developer Interview Questions and Answers

Q1. Number series in aptitude
Ans. 
Number series in aptitude involves identifying the pattern in a sequence of numbers and predicting the next number.
• Look for patterns such as arithmetic progression, geometric progression, or a combination of both.

• Check for alternate numbers, differences between consecutive numbers, or multiplication factors.

• Consider prime numbers, squares, cubes, or other mathematical operations applied to the series.

• Example: 2, 4, 6, ...read more
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Q2. Relation ships in berbal
Ans. 
Relationships in verbal communication are crucial for effective collaboration and understanding.
• Verbal communication involves both verbal and non-verbal cues

• Active listening is key to building strong relationships in verbal communication

• Clarity and conciseness in speech can enhance relationships

• Empathy and understanding of others' perspectives are important in verbal relationships
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Q1. Explain the four branches of oops
Ans. 
The four branches of OOP are encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Allowing a class to inherit properties and behavior from another class.

• Polymorphism: The ability for objects of different classes to respond to the same method call.

• Abstraction: Hiding the complex implementation details and showing only
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Q2. Explain about the structures in c
Ans. 
Structures in C are user-defined data types that allow grouping of variables of different data types under a single name.
• Structures are used to represent a record which consists of different data types.

• They are defined using the 'struct' keyword.

• Each variable in a structure is called a member.

• Structures can be nested within other structures.

• Example: struct employee { int emp_id; char emp_name[50]; float emp_salary; };

• E
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Q1. Can you introduce yourself?
Ans. 
Experienced Full Stack Developer with expertise in front-end and back-end technologies.
• Experienced in HTML, CSS, JavaScript for front-end development

• Proficient in Node.js, Express, MongoDB for back-end development

• Familiar with React, Angular for building interactive web applications
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Q2. What is graphQL?, What is REST API? and which is better graphQL or REST API?
Ans. 
GraphQL is a query language for APIs and a runtime for executing those queries. REST API is a set of rules for building web services. Both have their own advantages.
• GraphQL allows clients to request only the data they need, reducing over-fetching and under-fetching.

• REST API follows a more rigid structure and is easier to understand for beginners.

• GraphQL is more efficient for complex queries involving multiple resources...read more
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I was asked to discuss the system design of Google Meet, with a primary focus on video processing and WebRTC.

A graph question regarding LC 1334.

Q1. Can you provide an introduction and a summary of your past experiences, as well as your motivations for wanting to join this company?
Ans. 
Experienced Full Stack Developer with a passion for creating innovative solutions and a strong desire to contribute to a dynamic team.
• Over 5 years of experience in full stack development, working on various projects from concept to deployment.

• Proficient in front-end technologies such as HTML, CSS, JavaScript, and React.

• Skilled in back-end technologies including Node.js, Express, and MongoDB.

• Motivated by the opportunity...read more
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Questions on string and arrays both are moderate level questions on hacherrank type for 20 marks

Q1. Constructor chaining
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Q2. Hasmap and treemap
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Give 10 questions from node js backend

Q1. Ask about angular and node js
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Q2. What is package.json
Ans. 
package.json is a file used in Node.js projects to manage dependencies, scripts, and metadata.
• It is a JSON file that contains information about the project, such as name, version, dependencies, and scripts.

• It is used to manage project dependencies by listing them in the 'dependencies' and 'devDependencies' fields.

• It allows developers to define scripts for tasks like building, testing, and running the project.

• Example: {...read more
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Q3. What is components in angular,how share data to component
Ans. 
Components in Angular are building blocks of an application. Data can be shared between components using input properties and output events.
• Components in Angular are reusable, self-contained units of code that define a part of the user interface.

• Data can be shared to a component using input properties, where data is passed from the parent component to the child component.

• Data can also be shared from a child component t...read more
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Q4. What is === and == ,and wher use === is real time projects
Ans. 
=== is strict equality operator, while == is loose equality operator. === is commonly used in real-time projects for accurate comparisons.
• === is a strict equality operator that checks both value and type of operands

• == is a loose equality operator that only checks the value of operands

• === is commonly used in real-time projects to ensure accurate comparisons and prevent unexpected type coercion issues
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Q5. Write arrow function syntax
Ans. 
Arrow function syntax in JavaScript
• Arrow functions are concise syntax for writing function expressions in JavaScript

• They have a shorter syntax compared to traditional function expressions

• They do not have their own 'this', 'arguments', 'super', or 'new.target' keywords
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Q6. What is difference between arrow function and anonymous function
Ans. 
Arrow functions are concise syntax for writing function expressions, while anonymous functions do not have a name.
• Arrow functions have a shorter syntax compared to anonymous functions.

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

• Arrow functions do not have 'arguments' object, while anonymous functions do.

• Arrow functions are not hoisted, while anonymous functions are hoisted.
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Aptitude questions with some basic coding questions

They have given 3 coding questions and some pseudo codings

Q1. Tell about your self
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Q2. Some coding questions
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It is easy to solve the Aptitude question and some identifying outputs of program.

Q1. What is class?and write a logic for object in a class.
Ans. 
A class is a blueprint for creating objects in object-oriented programming.
• A class defines the properties and behaviors of objects.

• An object is an instance of a class.

• Example: Class 'Car' can have properties like 'color' and 'model', and behaviors like 'drive' and 'stop'.
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Q2. 1.swap two numbers without using temp variable 2.Reverse the string.
Ans. 
Swap two numbers without using temp variable and reverse a string without using built-in functions.
• To swap two numbers without using temp variable, use bitwise XOR operation.

• To reverse a string without using built-in functions, use two pointers approach.

• Example for swapping numbers: a = a ^ b; b = a ^ b; a = a ^ b;

• Example for reversing a string: use two pointers to swap characters from start and end of the string.
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Now, I am preparing for the third round.
So, I don't know the Coding Question.

Easy aptitude, 30 min with 20 question

Q1. What is Virtual DOM, Explain ?
Ans. 
Virtual DOM is a concept in web development where a lightweight copy of the actual DOM is created and manipulated for efficient rendering.
• Virtual DOM is an abstraction of the real DOM.

• It is used in frameworks like React to improve performance.

• Changes made to the virtual DOM are compared with the actual DOM, and only the necessary updates are applied.

• This approach reduces the number of direct manipulations on the actual...read more
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Q2. What is Higher Order Component ?
Ans. 
Higher Order Component is a function that takes a component and returns a new component with additional functionality.
• Higher Order Components (HOCs) are a pattern in React for reusing component logic.

• They are functions that accept a component and return a new component with enhanced capabilities.

• HOCs can be used for cross-cutting concerns like authentication, logging, or data fetching.

• They enable code reuse, compositio...read more
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Q3. Life Cycle Methods in React
Ans. 
Life Cycle Methods in React
• React components have several life cycle methods that are called at different stages of a component's life

• These methods allow developers to perform actions like initializing state, fetching data, and updating the UI

• Some commonly used life cycle methods are componentDidMount, componentDidUpdate, and componentWillUnmount
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