The design and an early data merge setup were already in place. My job was to make them hold up at scale and carry production through to print-ready files. I extended the data merge template so it drove almost every element on the page, with charts generated straight from the master spreadsheet, which cut production time massively. I also formalised the design itself: spacing, element placement and typographic hierarchy, defined as rules instead of approximations, so the last page follows the same logic as the first.