Every company has it's benefits and downsides. Wiredrive is not without its faults. The transition from small to medium will have its growing pains as divisions and individuals try to define what their roles are supposed to be. This primarily affects managers and not the teams themselves. Teams, however, do need to be patient while the managers situate themselves.
This isn't a con as much as a disclaimer. While the work is challenging, not everything will be easy. There will be dev projects that are hard, complicated, difficult, etc. The Wiredrive application is not some simple consumer product. It is a B2B application that needs to service a demanding industry. Not every feature will be fun and exciting. Not every upgrade will be cool and shiny. It will be Work. If you want somewhere easy where you can check out, you won't like it here. If you want something that makes you better as an Engineer, you will like it here.