I went through 3 rounds of technical discussion, Mostly asked plain old javascript, object-oriented and Design patterns. And some logical implementations in a very optimized way like Str reverse, remove duplicates from the array. you pretty much don't answer these but you need to write code for every question asked.

Faced six rounds to complete a Interview process 5 are purely technical followed by one Metal ability and one HR. Took almost 30 days to complete all 6 Rounds to finish and to get final feed back. Interview Process starts with Two technical on the same day, and one Cross Region on some day after a week and one more round, which is cross business unit which is again a technical round followed by Manager and Mental ability which is done by hiring HR Manager. last three rounds were happens on same day. each round took more than an hour. If you are preparing/attend for an interview with ServiceNow be prepared to spend long hours in their campus. Over all my experience with this is Awsome.