About 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 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
About Semble
Takeoffs, design, and field work. Powered by AI.
Required skills
Refer someone
Know someone great for this role?
Share your link. If they get hired through Standout, you get $3,000.
Job details
Salary
$150,000 - $250,000
Equity
0.8% - 1.4%
Location
San Francisco, CA
Experience
1+ years
Funding
Total raised
$500K
Last stage
Seed
Investors
What happens next.
No applications, no recruiter spam. Just the intro.
Confirm the fit
A few questions to make sure this role is the right shape for you. Two minutes.
I pitch you to the company
I write the intro, send it to the founder, and handle the back-and-forth.
A meeting lands on your calendar
If they’re a yes, I book the chat. You show up — that’s the whole job-hunt.