ServiceNow Coding Interview Questions
26 ServiceNow coding interview problems with full optimal solutions — 15 easy, 8 medium, 3 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an ServiceNow interviewer values, and a FAQ section.
Showing 3 problems of 26
- #24hardrarely asked
24. Median of Two Sorted Arrays
Find the median of two sorted arrays in O(log(m+n)) time using binary search on partition points. ServiceNow asks this hard problem for senior roles because the binary-search-on-partition insight mirrors the data-partitioning reasoning required when merging sorted incident streams across multiple database shards.
- #25hardsometimes asked
25. Trapping Rain Water
Calculate the total water trapped between elevation bars after rain using two-pointer or stack approaches. ServiceNow asks this hard classic to test multi-pointer reasoning under constraints — the capacity-calculation pattern maps to buffer-management logic in their event ingestion queues.
- #26hardrarely asked
26. Serialize and Deserialize Binary Tree
Design algorithms to convert a binary tree to a string and back without information loss. ServiceNow asks this hard problem because serializing and restoring hierarchical data structures is core to their workflow-snapshot and CMDB-export features — interviewers grade candidates on null-marker strategy and delimiter robustness.