WESCO Senior Sdet Engineer Interview Questions and Answers

2 medium dsa que - one is of binary search, one is from graph

Q1. Define oops principle
Ans. 
OOPs principles are the fundamental concepts of object-oriented programming that help in designing and implementing software solutions.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

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

• Polymorphism: The ability of different classes to be treated as instances of a common superclass.

• Abstraction: ...read more
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Q2. Define os concepts
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OS concepts refer to fundamental principles and components of operating systems.
• Process management - handling processes, scheduling, and resource allocation

• Memory management - managing memory allocation, virtual memory, and paging

• File system - organizing and accessing files on storage devices

• Device management - controlling and communicating with hardware devices

• Security and protection - ensuring system and data securit...read more
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Hackerrank - 3 questions 2 hrs

Hackerrank test with medium questions

Q1. Machine coding round to design a shopping cart
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Q1. Automate calendar
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Q2. OOps concept in java
Ans. 
Object-oriented programming concepts in Java focus on classes, objects, inheritance, encapsulation, and polymorphism.
• Classes are blueprints for objects

• Objects are instances of classes

• Inheritance allows a class to inherit properties and behaviors from another class

• Encapsulation hides the internal state of an object and only exposes necessary functionalities

• Polymorphism allows objects to be treated as instances of their
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Q1. Technical questions for programming language like plc
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Round duration - 60 minutes
Round difficulty - Easy

It was a L1 technical round where questions from DS algo were asked, along with my work exp and projects. It was a face to face video round with 2 panel members

Q1. Find Number Of Islands
You are given a 2-dimensional array/list having N rows and M columns, which is filled with ones(1) and zeroes(0). 1 signifies land, and 0 signifies water.
A cell is said to be conn...read more
Ans. 
import java.io.*;
import java.util.*;
public class Main
{
public static void DFS(int[][] input, int i, int j, int row, int col){
if(i<0||j<0||i>row-1||j>col-1){
return;
}
if(input[i][j]==1){
input[i][j]=0;
DFS(input,i+1,j,row,col);
DFS(input,i-1,j,row,col);
DFS(input,i,j+1,row,col);
DFS(input,i,j-1,row,col);
}
}

public static int countNumber(int[][] input, int row, int col){
int count =0;
for(int i=0;i {
for(int j=0;j if(inpu...read more
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Q2. System Design Question
How to prevent breaking of singleton pattern using reflections?
Ans. 
Tip 1 : Provide correct answer i you know
Tip 2 : Revise Java concepts
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Round duration - 30 minutes
Round difficulty - Medium

It was a System design round and the interviewer was very friendly, he gave ample hints and it was a productive interaction.

Q1. System Design Question
Design LRU cache.
Ans. 
Tip 1 : Practise System Design well
Tip 2 : Ask questions wherein necessary
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Round duration - 45 minutes
Round difficulty - Easy

It was a standard manager where I was asked many questions related to my work exp and behavioural questions