Pros
They really invest in training people. They trust you with a lot of responsibility for early in your career. All Field Consultants are ostensibly equal so flat hierarchy, no promotion rat race
Decent work-life balance
Very smart, kind coworkers who you can ask for help. Cannot emphasize this aspect enough.
Had a lot of trust in leadership
The technology stack that you use is great and well-documented
Good food. Good office
Company has the benefits of a large enough company, e.g. great mentorship and organizational structure. It has the benefits of a small enough company: you know most people and you get ownership of projects.
Cons
Overall: the place is optimized for employees who stay there forever. Not necessarily the best place to start your career and then leave. Training takes forever. They're not great about giving code reviews, which makes learning tough. You get very good at Ab Initio's proprietary technologies, at cost of learning other tech. Lack of promotion structure feels a bit existential (not a huge problem).
Field consulting had a massive organizational restructure a few years back, which caused some growing pains and a "spikier" work/life balance.
Office is in Lexington, can be annoying to get to.