Long the provence of specialists in the hermetic world of enterprise software development, business intelligence (BI) is increasingly important to smaller, more agile companies and startups who need access to near-real-time information to make critical business decisions. With its support for aggregation and reduction of massive amounts of data and its flexible schemas, MongoDB is a great choice for creating lightweight, denormalized data stores optimized for BI, with the added bonus of peaceful co-existence with transactional data stores. In this talk I will explore how Trunk Club captures and analyzes customer information, monitors user behaviour, feeds machine-learning algorithms for decision support, and delivers value to business stakeholders through simple querying and reporting interfaces.