ServiceNow Coding Interview Questions (2026)
Most-reported questions and how to practice them
72 coding questions reported by candidates for ServiceNow, sorted by how often they were reported. Source: community-sourced LeetCode company lists.
What the ServiceNow question data shows
Of the 72 questions reported for ServiceNow, 72% are medium, 18% are hard and 10% are easy. The most reported are Longest Substring Without Repeating Characters, LRU Cache, Lexicographically Smallest String After Operations With Constraint, Number of Distinct Roll Sequences, Find Minimum Diameter After Merging Two Trees.
This list comes from community-sourced LeetCode company lists. It covers coding questions only. It does not tell us how many rounds ServiceNow runs, what each round covers, or what it pays, and those change by role, level and team, so we do not list them. Ask your recruiter what each round covers, and check the company's careers page.
Prepare for the rest of the loop with the coding interview patterns guide, the system design framework, and the STAR method guide. Written by Kieron.
Practice what you read with a free AI mock interview, see how the tools compare in our AI interview copilot comparison, or check Aissence pricing.
ServiceNow Interview Questions
72 LeetCode questions — sorted by frequency. Question frequency is community-sourced from public interview reports and may not reflect the current process; verify details with the employer.
Last reviewed: September 5, 2026 · Source: LeetCode company-wise interview questions (community reports) · Reviewed by the Aissence Editorial Team.
Longest Substring Without Repeating Characters
LRU Cache
Lexicographically Smallest String After Operations With Constraint
Number of Distinct Roll Sequences
Find Minimum Diameter After Merging Two Trees
Generate Parentheses
Trapping Rain Water
Number of Islands
String Compression
Maximum Score with Co-Prime Element
Container With Most Water
Valid Parentheses
First Missing Positive
Asteroid Collision
Sliding Window Maximum
Pacific Atlantic Water Flow
Longest Repeating Character Replacement
Best Time to Buy and Sell Stock II
Two Sum
Longest Palindromic Substring
Tips for Success at ServiceNow
Start with the 30 most reported ServiceNow questions, then work down the list.
Mediums are the bulk of the list (72%), so spend most of your time there.
Time yourself: 20 to 30 minutes per medium, then explain your solution out loud as if to an interviewer.
After each problem write down the pattern and the signal that revealed it. Patterns transfer to problems you have not seen.
Pair coding practice with a system design framework and prepared behavioral stories; most loops include more than coding.
How to Practice for ServiceNow Interviews
Practice answering out loud with an AI interviewer built from your resume and the job description, and get a score and specific fixes for each answer. We are not affiliated with ServiceNow, and the mock interview is general practice rather than a simulation of ServiceNow's own format.
- ✓ Free mock interview built from your resume and the job description
- ✓ Desktop Interview Copilot for live interviews, where the rules allow it
- ✓ Behavioral practice with feedback on structure and specifics
- ✓ System design practice with follow-up questions
Frequently Asked Questions
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