I interviewed for ServiceNow for the position of Senior Software Engineer(IC3). Applied via Employee referal.
The whole process took around 1 month to complete.

YOE: 5+

Round1 : 60min

1. [DSA] Number of sub arrays whose sum = K. Variation of https://leetcode.com/problems/subarray-sum-equals-k/
   Provided O(N^3), O(N^2), O(N) solution
2. LLD design of JDBC type of service, SOLID Principles, Design patterns.

Round 2: 120min

1. [DSA] Matrix based problem. We have to find the row with least number of ones. Provided O(NlogN) solution.
2. [DSA] Math based problem. Provided O(N^2) solution. Few test cases failed.
3. Discussion on Java, Spring internals, Db Internals, Resume

Round 3: 60min

1. Discussion on Work experience
2. DB design for Restaturent booking apps.

Round 4: 60min

1. Discussion on Work experience
2. Discussion on Different programming languguges pros, cons
3. Discussion on Mongo vs postgresql, Consistent Hashings, Scaling issues, Resume.
4. [DSA] Customized sorting algorithm(Couldn't find the question anywhere). Able to provide solution using Top-Down DP with O(N^2) solution.

Result: SELECTED