In some embodiments, a method receives a request for an interface. A configuration for the interface includes a plurality of slots that are associated with a plurality of collection pools, wherein each collection pool is configurable with a ranking strategy. The method determines a collection pool for a slot in the interface where the collection pool is associated with a plurality of collections. A collection is received for the slot. The collection is determined by ranking the plurality of collections using a ranking strategy for the collection pool to generate a ranking of the plurality of collections. The method outputs the collection for the collection pool for display in the slot of the interface.