We're building AI agents that design building-systems (fire, HVAC, plumbing, security) instantly and code-compliantly.
The $600B building-system integration industry still runs on spreadsheets and manual drawings, even as building codes rapidly evolve and become more localized. It’s a massive blind spot for the tech world.
We are transforming building-system design from a months-long, error-prone process into an instant, automated workflow. Semble AI is becoming the industry standard for top quality commercial building design.
### **What you’ll work on**
As a founding engineer, you’ll work directly with the founders to 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
* 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**
* **Typescript / React / Node / Express / PostgreSQL**
* **Python (PyTorch, NumPy, etc.)**
* **Vision models**: object detection, instance + semantic segmentation
* **AI Agents:** multi-agent reasoning, workflow orchestration, MCP
* **RAG pipelines**: vector DBs, embeddings, chunking strategies
### **You might be a great fit if you**
* Have strong experience in ML (vision AND LLMs), backend, building AI agents, and 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 will become the industry standard for top quality commercial building design
Visa sponsorship is not available for this role.
