Rebar builds AI-powered estimating software for commercial HVAC, plumbing, and electrical contractors. The platform ingests drawings, detects equipment schedules, identifies symbols, and produces a priced takeoff via a real-time, collaborative canvas editor. PMF is strong and the company raised a $14M Series A earlier this year. Stack includes TypeScript/React/Next.js, Python, PyTorch, Postgres, Temporal, AWS, Kubernetes, and Modal.