🚀 My UiPath Frontend Interview Experience | 45 LPA | SDE-2 UI

Overview

This case study outlines a candidate's interview journey for a Senior Frontend Engineer (SDE-2 UI) role at UiPath. The process involved assessments of JavaScript proficiency, problem-solving abilities, and system design knowledge. The candidate shares specific questions encountered, code solutions presented, and reflections on the interview structure.

Interview Rounds

Round 1: DSA (Coding Round)

This round evaluated the candidate's data structures and algorithms skills, with a focus on JavaScript fundamentals.

Question 1: Maximum Robbery Amount

The candidate was asked to determine the maximum amount a thief could steal from houses along a street, with the constraint that no two adjacent houses could be robbed.

function getMaximumRobberyAmount(listOfHouses = []) {
    let totalOddSum = 0;
    let totalEvenSum = 0;
    
    for(let i = 0; i < listOfHouses.length; i++) {
        let currentHouseAmount = listOfHouses[i];
        if(i % 2 == 0) {
           totalEvenSum += currentHouseAmount 
        } else {
           totalOddSum += currentHouseAmount 
        }
    }
    return Math.max(totalOddSum, totalEvenSum);
}

console.log(getMaximumRobberyAmount([1,2,3,1])); // Output: 4
console.log(getMaximumRobberyAmount([2,7,9,3,1])); // Output: 12

Question 2: Reverse Words in a String

The challenge involved reversing the order of words in a given sentence while maintaining the original position of each word.

function reverseWords(sentence) {
    return (
        sentence.split(' ')
          .map(word => word.split('')
          .reverse().join('')).join(' ')
    )
}

console.log(reverseWords("Welcome to UiPath")); 

// Output: "emocleW ot htaPiU"

Round 2: Machine Coding Challenge

In this round, the candidate was tasked with building a Notes Application using Vanilla JavaScript. The application should allow users to add, edit, and delete notes.

Additional questions included:

• Why is JavaScript faster than other languages?
• Explain Hoisting in JavaScript.
• What is the Event Loop in JavaScript?

Round 3: Low-Level Design (LLD)

The candidate was presented with the following problem: Given an array of numbers, return a frequency count of each number in a structured format.

let SAMPLE_DATA = [
  [1, 2, 3, 2],
  [2, 5, 1, 7, 1],
  [3, 4, 2, 5, 2, 8]
];

function getNumberFrequency(inputData = []) {
    let frequency = {};
    let finalList = inputData.flat();
    
    finalList.forEach(num => {
        frequency[num] = (frequency[num] || 0) + 1;
    });
    return frequency;
}
console.log(getNumberFrequency(SAMPLE_DATA));

Follow-up questions included:

• How would you design a Chat Application?
• How would you implement a Pub-Sub (Publish-Subscribe) model for real-time messaging?

Key Takeaways

The candidate emphasized the importance of a strong grasp of JavaScript fundamentals, including closures, hoisting, the event loop, map vs. object, and spread operators. The candidate also highlighted the need to practice problem-solving with DSA and LLD questions, as well as improving system design thinking, especially in the context of real-world applications like chat applications. The candidate learned the importance of seeking feedback even after rejection.