Pros
It has beautiful outlook of really cool startup with all groovy interiors. But in reality, Its just like any software service company, struggling with business and finding its own identity. It is living on past glory and current politics. Once upon a time, these were the pioneers who wrote libraries of core java, defined what Agile meant. But it failed to sustain that culture of being leader. There are few good people to get insight from. But lately, most of them just became anarchist. Less business and more of this leftist activist thing for social cause. Both of them are failing miserably for basic reasons, like honesty and integrity.
Cons
As far as UX is concerned, since company itself is dealing with new methodologies of "Agile", the UX needs to align to it. Unfortunately, UX leadership comes with no formal background of design. A. It doesn't clearly understand the difference between BA and UX. B. The interview process for UX is extremely weird. One has to go through some logic test and later a role playing kind-a QA. Its absolutely unclear what UX leadership is expecting from designer. Its neither design question nor a design process questions. There is sense of insecurity in UX leadership, which shows up as they defend their views at work. The process and structure for UX is not undefined. Advise for management: Specially for Thoughtworks, UX is key enabler to fetch/retain projects. Consider investing/changing UX leadership (at least for Pune, other Bangalore/Noida teams seem decently good)