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