Pros
Disclaimer: My review is about Trifork.nl which was formerly DutchWorks (formerly Orange11 and even if you go further it was called JTeam!). Core team of company has been together for many years and despite several rebrandings, merge and acquisitions the super ninja technical guys are there. The team has strong connections with SpringSource and ElasticSearch if you are interested in those java tools. If you are looking forward a classic and capable custom development shop based on Java technologies here is the place. Nice office and friendly colleagues are a big plus.
Cons
Disclaimer: My review is only about Trifork (Amsterdam) and as far as I've heard from friends in other offices of Trifork in Denmark & Switzerland these are not true in their offices. * No focus at all: There is no vision, no plan and no nothing. They just say yes to any project proposal. Web, mobile, consulting , training you name. You may be juggling between 3 projects at a time that usually all of them are behind schedule and under fire. * Dishonesty by management: Some high ranked managers are strong believer in playing games, being super opportunist at any cost, trying to sell your billable hours under any circumstance and worst than all: micro management. * Not that much international in hearth: I know they like to be, and love to be considered as an office with international culture but this is not the exact case. However this is not necessarily bad thing and depends on your own mileage.