I designed the entire product and built the backend for the Guidance Dogfooder, an internal tool that let anyone on the guidance team test advertiser guidance experiences before advertisers ever saw them. Before this tool, testing meant navigating broken queries, unknown experiment combinations, and scattered docs, which wasted time and made quality testing harder. In the tool, a person could select a guidance type like fragmentation or auction overlap, add parameters like experiment variant and surface, and get a list of test ad accounts to launch from, then walk through the full guidance flow in practice to find bugs and check how it worked. I built the backend data model for saved selections, while also fixing UI bugs. The tool reached about 150 users, launched Ads Manager more than 7,000 times, and saved about 266 hours of testing time, while making bugs easier to find and helping new team members learn the guidance inventory by trying it themselves.