Built a B2B SaaS tool that connects to billing APIs (OpenAI, AWS, Stripe, Datadog) and decodes every invoice line item into plain English. Detects waste — idle resources, unused tiers, overage spikes, and tells founders exactly what to cut with dollar-precise savings estimates and one-click cancellation emails. Built end-to-end: landing page, dashboard, AI parsing pipeline via Claude API, and Supabase backend.