ServiceNow | Software Engineer | Hyderabad

Current Exp - 2+ year
I applied for ServiceNow through carrer portal and the recruiter contacted me next day.

Call from recruiter: She was polite and said there will be three rounds of interview.

Round 1: (DSA & Technical)
-> given code snippet of javascript and asked to debug
asked about let, var, const

var temp = 'hi'
function display () {
	console.log(temp);
	var temp = 'bye';
};
display();

follow up question - if var is replaced by let.

-> asked about javascript hoisting
-> Virtual DOM
-> one dsa question

arr[] = {1, 6, 11, 16, 21, 31};
this array has AM series
and one element will be missing except first and last
find missing element

I explained my brute force approach

private static int func(int[] arr) {
        int i = 0;
        int len = arr.length;
        int diff = (arr[len - 1] - arr[0]) / (len);
        
        for(i = 0; i < len - 1; i++) {
            if(arr[i] + diff != arr[i + 1]) {
                break;
            }
        }
        
        return arr[i] + diff;
    }

     public static void main(String []args){
        int arr[]  = {1, 6, 11, 16, 21, 31};
        int res = func(arr);
        System.out.println(res);
     }

where d = l - a / n - 1; by AM formulae of finding last term
Time complexity - O(N)
Space complexity - O(1)

She asked to further optimise it
i explained binary search approach and she asked to explain the complexity
Time complexity - O(log N)
Space complexity - O(1)

-> another dsa question,

input: S = banana, T = ban, Output: 3
input: S = Sosasossos, T = sos, Output: 6

how many ways we can make T from S
Unable to find the logic ☹️ (later i realises i was thinking the right logic, but unable to tell ☹️ actually question was this - Count distinct occurrences as a subsequence)

-> In github, we push the code and without refresh it is being updated in real time, she asked how it is ?
i was stuck, i gave one approach she said it is similar but think more.

I don't know how interview was, i am very scared, because i was expecting some design pattern, java or sql questions but she was more align towards frontend ☹️

Got rejection email next day :(

** Update: Another Recruiter scheduled my Interview Again**

Round 1: (DSA & Technical)

1. Product Array except self (https://leetcode.com/problems/product-of-array-except-self/)
2. Median of Running data stream (https://leetcode.com/problems/find-median-from-data-stream/description/)
3. Design Counter with proper css in React js having functionality that if we do any action(increment / decrement), It should block the action for next 5 sec, after 5 sec you can do action

i completed DSA questions, for react js question, i was unable to implement setInterval(), later he asked some css to implement some i did some part, but some part, i was very close to it

Overall, It went well :)

Update: Got Rejection email again :(
I tried my best this time and coded DSA questions well also
Overall interview was good, still they rejected without any feedback