Pros
Great benefits Great people Steady career advancement Flourishing community They will train you They will give you all you need to develop (tools, mentoring, sponsorship, etc) Work from home Travel to different destinations Paid conferences Hackathons Ship-It Days Fidelity TV (watch hundreds of TEDx talks, presentations, and conferences from influential and successful people) - some of these you won't see anywhere else but at Fidelity) FCat library gives you access to paper and electronic books (Safari books including) Many talented technologists Fidelity Cares Gym, massage, doctor, cafeteeria on-site I can't list everything. Seriously. They are good!
Cons
My career was going well but unfortunately it took a sharp turn. Company motto "Turn here" did not really work well for me. I had bullies on my team including my senior manager who was plain incompetent. I had to leave because every day there became a terror. Mobbing and bullying would not stop after talking to my immediate manager. HR did not care when I reported unethical conduct. They told me I needed a good sense of humor. However, you will agree that being called jerk and hearing jokes about your nationality every day is not fun.