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We built StructCalc AI—a full-stack structural engineering calculation platform handling AISC 360-22, ACI 318-19, and ASCE 7-22 compliance—in production at structcalc-ai.vercel.app. This deep dive covers the 15 calculation engines powering 25 pages of structural design workflows, the FastAPI backend deployed on Railway, the React/Vite frontend on Vercel, PE stamp verification pipelines, and AI peer review integration that generates professional PDF calc packages. We'll walk through the exact architecture decisions, how we verified all 19 API endpoints for code compliance, and the infrastructure patterns that let a vertically integrated business (real estate wholesaling, demolition, valet services, credit repair, mineral rights) add a production SaaS layer without fracturing the stack—all built on Supabase, self-hosted PostgreSQL, and VAPI telephony for seamless customer handoff.
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