Pros
Many great engineers and other people, hackathons, game room, guess the catered lunch & snacks are worth something
Cons
Doing exciting work with like-minded passionate people in a fun environment sold me on Addthis so I never could understand why I kept sensing fear from some coworkers who had been at the company longer. Then people started disappearing. Senior management told us everything was great, that they were simply cutting some unneeded positions and the outlook was still peachy. Just a couple weeks before getting cut along with 15% of my colleagues I was told everything was fantastic with the company and with my personal performance. They sent us home in a matter of minutes and gave nearly no severance. I've since been told by several other ex-Addthis (Clearspring) employees that this was nothing new. Besides total lack of job-security other cons are: Unresolved disagreements in senior leadership, culture divisions within company seemingly stemming from the different merged companies, and the lack of defined, earned PTO makes it hard to take time off