Pros
Many people in the company are passionate and pragmatic technologists who want to help their clients to deliver value to customers.
Cons
ThoughWorks is about travel. Do not join the company if you want to be based and work in a given city. Management can be fine, but if you're unlucky you'll suffer. Most managers in the company are not trained or experienced to act as managers, which means they end up causing a lot of damage. I had a great time with some managers in the NY office, but in the past one of the MDs had a management style that caused a high attrition rate, and despite the shortcomings she was kept for years. HR management is generally not great either. Unfortunately the company has a policy of moving inept managers into "social responsibility" roles, as opposed to let them go. Consultants in general are great, and make good colleagues to work with. However, the "principal" consultants are generally disconnected from technical work and seem to spend most of their time doing sales-related activities (or personal marketing). Whenever they end up coming with actual technical solutions, they generally cause a lot of damage to clients. The company is fairly inconsistent among its offices. In the USA, in general, it's not a company I'd recommend. In Europe it's ok-ish. In India and China it's about offshore work, and substantially better than other local companies. In Brazil it's mostly about left-wing politics. In Australia it seems to be a decent company.