Google App Engine Solutions Expert

We are building an application that will essentially accept up to a billion requests and will log parameters from the request into a data store. The application will be built on Google App Engine (GAE) We need someone experienced with GAE to help us architect a solution. This is NOT a coding role. * The solution must perform and scale well. * The solution must be cost effective. Clearly writing a billion entries to Google's Data Store will be too expensive, so what other options are available to us? * Although we use GO on GAE we are open to using one of the other languages, if there is a clear and compelling advantage in doing so. * You should have experience or have a very good understanding of the components of GAE, such as the data store, memcached, task api, blob store etc. This job will take the form "we ask questions, you provide the answers" type role. We do not need you to write code (unless to demonstrate an example) and we do not need you to produce documentation. More details will be provided to applicants.