Pros
Due to the fast growth of the company, there are many opportunities to grow your skills, try new things, and gain exposure to areas of the business you may not normally experience in a larger company. There are many strong, smart people at ServiceNow. They will challenge your thinking and you will grow and learn from the experience.
Cons
I have never worked at a company where people on the team are constantly worried about being fired. It is well known the company fires people quite readily. If a project goes the wrong way, someone is blamed. There is no mentoring. Leadership does not take time to mentor individuals nor teams with mutual goals. Leadership refuses to reflect or acknowledge their role in projects going sideways. Rapid growth of teams is causing many roles to step on top of each other while leadership competes for sustaining their headcounts instead of working toward a joint vision. It is every man for himself. Show your value or be gone. If you choose to interview here, ask about the team turnover rate.