Barclays PLC Full Stack Developer Interview Questions and Answers

Q1. Ask questions related to CSS, Javascript, React, Node and Cloud stuff
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Quantitative , figure ,mcq question based on tech stack and 2 coding question which are basic. 90 minute time limit.

Q1. Angular question
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Q2. .net question and sql question
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Quantitive Aptitude, General programming,oops

GK, Quantitative Aptitude

C# Fundamentals , ADO.NET,LINQ

Q1. Why there are so frequent change.
Ans. 
Frequent changes in technology are driven by advancements, market demands, and user feedback.
• Advancements in technology lead to new tools and frameworks being developed.

• Market demands require companies to adapt quickly to stay competitive.

• User feedback helps improve products and services, leading to updates and changes.

• Examples: Introduction of new programming languages like Swift, shift towards cloud computing, update...read more
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Q2. Please tell me about your understanding with roll
Ans. 
Roll is a term used in web development to describe the process of deploying code changes to a live server.
• Rolling back changes means reverting to a previous version of the code.

• Rolling forward means applying new changes to the live server.

• Rolling deployments involve gradually updating servers in a controlled manner to minimize downtime.

• Automated rollbacks can be triggered in case of errors or issues during deployment.
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Q1. Explain architecture of project
Ans. 
The project architecture follows a microservices design pattern with separate front-end and back-end components.
• Utilizes microservices architecture for scalability and flexibility

• Separate front-end and back-end components for modularity

• May include technologies like Docker for containerization and Kubernetes for orchestration
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Q2. Async and await difference
Ans. 
Async and await are keywords in JavaScript used for handling asynchronous operations.
• Async is used to define a function as asynchronous, allowing it to use the await keyword.

• Await is used to pause the execution of an async function until a Promise is settled.

• Async functions always return a Promise, which resolves with the value returned by the function.

• Using async/await makes asynchronous code easier to read and write
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Round duration - 70 minutes
Round difficulty - Medium

There were 3 problems 1 was easy and 2 were of medium types.

Q1. 
Odd Even Levels in Binary Tree
Given a binary tree, the task is to compute the modulus of the difference between the sum of nodes at odd levels and the sum of nodes at even levels.
Input:
The first line...read more
Ans. DFS
1. Create two variables, one for storing the sum of nodes at the odd level and one for storing the sum of nodes at even level.
2. Use the below algorithm to calculate level sums where:
oddSum: denotes sum of nodes at odd levels, initially 0.
evenSum: denotes sum of nodes at ecen levels, initially 0.
level: the level of the current node, initially 1. 
void oddEvenLevelHelper(current, oddSum, evenSum, level)
 
• If the cur...read more
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Q2. 
Rotting Oranges Problem Statement
You are given a grid containing oranges where each cell of the grid can contain one of the three integer values:
• 0 - representing an empty cell
• 1 - representing a fre...read more
Ans. Naïve Solution
The idea is very simple and naive. We will process the rotten oranges second by second. Each second, we rot all the fresh oranges that are adjacent to the already rotten oranges. The time by which there are no rotten oranges left to process will be our minimum time.
 
In the first traversal of the grid, we will process all the cells with value 2 (rotten oranges). We will also mark their adjacent cells ...read more
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Round duration - 50 minutes
Round difficulty - Medium

the interviewer was very polite and straightforward, he didn't ask me to introduce myself and he directly jumps to the coding problems.
What is new about the relationship between the and tags in HTML5?
Explain Components, Modules and Services in Angular

Q1. 
Circular Move Problem Statement
You have a robot currently positioned at the origin (0, 0) on a two-dimensional grid, facing the north direction. You are given a sequence of moves in the form of a string ...read more
Ans. Optimal Approach
Initialize a variable ‘direction’ with 0 which means that the robot is initially facing towards the north.
direction: 0 -> Robot is facing towards the North
direction: 1 -> Robot is facing towards the West 
direction: 2 -> Robot is facing towards the South 
direction: 3 -> Robot is facing towards the West
 
Initialize two variables ‘x’ and ‘y’ as 0. They will represent the position ...read more
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Round duration - 70 minutes
Round difficulty - Easy

What is a View in sql? What are the TRUNCATE, DELETE and DROP statements?

Q1. 
Rotate Matrix by 90 Degrees Problem Statement
Given a square matrix 'MATRIX' of non-negative integers, rotate the matrix by 90 degrees in an anti-clockwise direction using only constant extra space.
Inpu...read more
Ans. Transpose and Reverse
The idea is to find the transpose of the given matrix and then reverse the columns of the transposed matrix. For example:
For the given 2D matrix:
	[ [ 1,  2,  3 ],
	  [ 4,  5,  6 ],
	  [ 7,  8,  9 ] ]
After taking transpose, it will become:
	[ [ 1,  4,  7 ],
	  [ 2,  5,  8 ],
	  [ 3,  6,  9 ] ]
After reversing the columns, it will ...read more
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Q2. 
Minimum Characters to Make a String Palindrome
Given a string STR of length N, determine the minimum number of characters to be added to the front of the string to make it a palindrome.
Input:
The first...read more
Ans. Brute Force
• The idea is pretty simple, as we can add only at the front, thus, we need to work on the prefix of the string.
• We need to find the largest prefix that is a palindrome. For example, in case of “abbac”, the largest prefix that is a palindrome is “abba”, now all you need to do is add the reverse of left out suffix i.e. “ca” at the front to make it a palindrome.
• This can be done in the following way:-
  • Until the str...read more
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Round duration - 20 minutes
Round difficulty - Easy

Round duration - 60 minutes
Round difficulty - Medium

11:05am – 12:05pm (IST). What are classes in javascript? how do you integrate js in html.

Q1. 
Longest Substring Without Repeating Characters Problem Statement
Given a string S of length L, determine the length of the longest substring that contains no repeating characters.
Example:
Input:
"abac...read more
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Q2. 
Print Nodes at Distance K from a Given Node
Given an arbitrary binary tree, a node of the tree, and an integer 'K', find all nodes that are at a distance K from the specified node, and return a list of th...read more
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Q3. 
Number of Islands Problem Statement
Given a non-empty grid of 0s and 1s, determine the number of distinct islands. An island is a collection of '1's (land) connected horizontally, vertically, or diagonall...read more
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Round duration - 60 minutes
Round difficulty - Medium

12:30pm – 1:30pm (IST). SQL questions What are Aggregate and Scalar functions? What is a Stored Procedure?

Q1. 
Next Greater Element Problem Statement
Given a list of integers of size N, your task is to determine the Next Greater Element (NGE) for every element. The Next Greater Element for an element X is the firs...read more
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Q2. 
Container with Most Water Problem Statement
Given a sequence of 'N' space-separated non-negative integers A[1], A[2], ..., A[i], ..., A[n], where each number in the sequence represents the height of a lin...read more
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Round duration - 60 minutes
Round difficulty - Easy

5pm – 6pm (IST)

It is very easy. Practice daily on Indiabix

I was given 2-3mins yo speak on the topic. It was is Indian Education system needs modification. Be confident while speaking.

A piece of paper was given to me and I need to tell the some basics of computer languages

How can I lead my team