ServiceNow - SDE -1 College Online Assessment
- Posted
- 19 Jan 2026
Summary
I recently underwent the ServiceNow SDE-1 college online assessment, which predominantly featured several coding challenges on data structures and algorithms, specifically linked lists and matrix problems.
How it went
My interview experience with ServiceNow for the SDE-1 role began with an online assessment. This assessment comprised multiple coding questions that tested my understanding of data structures and algorithms. I've listed the problems below that I encountered during the assessment, along with their LeetCode problem links for reference.
Questions asked (4)
- 01
Reverse Linked List II
Data Structures & Algorithms · Medium
Open the problemGiven the head of a singly linked list and two integers left and right where left <= right, reverse the nodes of the list from position left to position right, and return the reversed list.
- 02
Remove Duplicates from Sorted List II
Data Structures & Algorithms · Medium
Open the problemGiven the head of a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. Return the linked list sorted as well.
- 03
Insertion Sort List
Data Structures & Algorithms · Medium
Open the problemGiven the head of a singly linked list, sort the list using insertion sort, and return the head of the sorted list.
- 04
Count Negative Numbers in a Sorted Matrix
Data Structures & Algorithms · Easy
Open the problemGiven a m x n matrix grid which is sorted in non-increasing order both row-wise and column-wise, return the number of negative numbers in grid.