I was interviewed at ServiceNow and didn't have a good experience. It took them more than 1 month to schedule rounds and I appeared only for 3 rounds. As It's been a while since I didn't hear anything from them, here is my experience.
1st round:
-> Resume discussion
-> HLD for capturing files from different data sources (Followed by the question, how to maintain uniqueness if multiple files are similar)
-> Reverse all words in a sentence (Code)
-> Find 1st and last index of number in a sorted array (discussed)
2nd Round:
-> Discussed the techniques used in the current project (end-to-end)
-> What can be done to improve the functionality
-> Discussion on the client side challenges
-> What makes the rendering slow on the client application
3rd Round:
-> Discussed current project (Again)
-> Discussed 3-4 features in details.
-> 2 Behavioural questions
And then they didn't reply, neither I contacted them after a while.