Semble AI

Compensation

Full Description

We're building AI agents that design building-systems (fire, HVAC, plumbing, security) instantly and code-compliantly. Construction companies use Semble AI to replace weeks of manual design work with a single automated workflow. The $600B building-system integration industry still runs on spreadsheets and hand-drawn markups, even as building codes grow more complex and localized every year. It’s one of the biggest untouched opportunities in construction tech, and we’re building the platform that becomes the industry standard. We’re looking for a founding engineer to work directly with the CTO and help shape the core AI, CV, and CAD/PDF automation stack that powers the product. What you’ll work on As a founding engineer, you’ll own and build systems such as: Vision pipelines that segment rooms, walls, and architectural elements from noisy PDFs/CAD files LLM + RAG workflows that interpret building codes and produce compliant designs Geometry pipelines using AutoCAD/Revit APIs to place devices automatically Full-stack features across our React/Node/Postgres platform You’ll have massive ownership and help set the technical direction of a company in a market that’s about to undergo a once-in-a-generation transition. Our tech stack Typescript / React / Node / Express / PostgreSQL Python (PyTorch, NumPy, etc.) Vision models: object detection, instance + semantic segmentation RAG pipelines: vector DBs + retrieval for code interpretation AutoCAD & Revit APIs for CAD extraction + geometry reasoning This role is ideal for someone who enjoys working across ML, backend, and system design. You might be a great fit if you Have strong experience in ML (vision AND LLMs), backend, or full-stack engineering Thrive in fast-moving environments and love shipping end-to-end Care about building reliable, production-grade AI systems Want to be early at a YC startup where your work directly defines the company’s trajectory Why join us You’ll work directly with the founding team (YC F25) Ship real AI systems into production for companies across the U.S. Own major pieces of the product and architecture Help shape the engineering culture from day zero Build something that materially improves building safety at scale