Pros
They respect senior engineers. Management does listen to and seek out input. The design phase of a project is fairly well done. The salary was good, as are the stock payouts.
Cons
Sadly you never get past the design phase, and further you have to do it between the gaps of operational fires. The on-call rotation is absolutely miserable. I once received 100 pages in a week, and I did not have a single week where I was not woken up in the middle of the night for a pointless and non customer affecting page. Further, if you are a US citizen you will be put on two separate on-call rotations (a second one for their gov clouds) and management does nothing to help you line up the rotations. Prior to being hired I was told there would be a single one call rotation if six people. Shortly after I was on two rotations of five people which often landed me on call twice in a month. Management was not forthcoming with this information before I was hired even tho I asked quite a bit about the rotation. If you are thinking of going to OCI make sure you ask very specific questions. To make it even more painful there is no interest in any kind of long term investment to make these alarms less frequent. They seem to be happy just throwing people at it without regard for the toll it takes on them.