1. The pace of growth is at times difficult to keep up with (but that's also part of the appeal). If you like working for a company where you can just come in and do your job and punch out, you might last but you certainly won't grow. Promotions and department transfers are competitive, as they should be - tenure alone will get you nowhere which some people have a hard time accepting.
2. Way too many emails. As with most companies, cross department communication is a challenge which some departments seem to have addressed with more and more emails. I could easily spend 30% of my day reading and responding to emails so one needs to develop a personal strategy for this. I'm not sure how to get around this, though. Slack certainly hasn't helped as that's just another channel one needs to manage, and that takes up more precious time.
3. Some of the technology we use that was developed in-house is buggy and the pace of development/improvement on that front is lacking. I understand that there is limited budget and tons of different priorities, but I don't think all the departments have the same customer in mind. Thankfully this seems to be improving, albeit rather slowly.
Not really a con since in some cases it would be impossible, but worth mentioning; some development opportunities only exist in UK or Portugal. I've seen numerous people move from their home country to London or Portugal to take the next step, but that's not an option for some. Working here will certainly prepare you for the next step in your career, though.
