Large, modular ERP system, with UI written in ASP .NET MVC and backend services communicating via message passing and REST calls. Designed to be highly configurable and customizable, robust, resilient and scalable.
I have developed two business modules of the system. One of it used Event Sourcing and CQRS techniques. For some of that time I was also part of the software infrastructure team, where I have researched and developed software components to be used in whole system. We used Scrum and Domain Driven Design approach. The project involved over 50 people at that time and new versions and modules are still being developed (as of May 2015).