Founding AI Engineer

About Semble

The all-in-one software for integrators.

The role

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 platformYou’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

Skills

• Express
• Node.js
• PostgreSQL
• Python
• React
• TypeScript
• Machine Learning
• Computer Vision