One system, many surfaces
The component library that kept it all consistent
The real engine of the project was the design system, built on Atomic Design principles: tokens and core components, then a pattern library for the negotiation and inventory flows, then page templates the team could assemble fast. I built it as a Sketch Cloud symbol library so everything updated globally without visual drift, and paired it with a Zeplin developer hand-off. That let a lean in-house team keep shipping, from the linesheet to product pages to a unified email system for offers, counter-offers, and marketing, all speaking the same language.