This unassuming app was one of the most challenging business-logic problems I've ever dealt with. AARP delivers brochures that are customized based on a laundry list of different factors and member attributes, and all of that logic was being maintained and delivered to the printer in a gigantic, unwieldy multi-tab spreadsheet.
It was up to our team at Hashrocket to take all of their necessary customization logic and re-abstract it into something hierarchical, systematic, and easily manageable by their content team.
We ended up building a system of Kits and Content Items, the latter of which can be customized by up to 3 variables at once, allowing for dozens of permutations of content in one place. Trust me, if you were the one in charge of updating these brochures, you'd be extremely excited right now.