Our servers are hosted in a managed colocation setup with secure connections to Amazon's EC2 infrastructure. We use VMWare to virtualize our infrastructure and CentOS is our Linux of choice. Our web application is actually a collection of services that are mostly written in Ruby. We use the Rails and Sinatra frameworks heavily, but are also fans of Plain Old Ruby Programs and have some services which employ a variety of other Ruby libraries.
We have a RESTful API-centric approach to development and are rapidly moving our client applications (native iOS, mobile web, and desktop web) to becoming strict consumers of this API. Our web application servers use Nginx, Unicorn, and HAProxy to handle requests, and we rely on Memcached, Redis, and PostgreSQL for caching and persistence.
We have a native iOS application and are actively working on modernizing and optimizing our user experience for all flavors of mobile browsers. We're trying to create a responsive, cutting-edge mobile experience for our users and employ a variety of Open Source Objective-C libraries like RESTKit in addition to being fluent in Apple's core iOS SDK. We have a small but growing mobile team that is driving development on the server side with its amazing product ideas and implementations.
We have a large analytics infrastructure that allows developers and product stakeholders to record and measure data over time. We use StatsD, Graphite, and our own Graphiti software to graph and keep track of our core metrics; our analytics team runs KPI queries against a database replica for our business statistics. We're trying to push the envelope with visualization and data recall, giving our investors and product team members insight into the data that comprises our day-to-day business as well as our long-term goals.