About Semble AI

Semble AI builds AI agents that design building-systems (fire, HVAC, plumbing, and security). Construction companies use Semble to replace weeks of manual design work with instant, code-compliant system layouts and bills of materials.

The $600B building-system integration industry still runs on spreadsheets and hand-drawn markups, even as building codes evolve rapidly and grow more localized. It’s one of the largest blind spots in construction tech, and we’re fixing it.

Jonathan and Ethan met studying computer science at Stanford. Jonathan worked at Convergint, one of the world’s largest building-system integrators, to learn the industry from the inside. Ethan’s motivation is personal: his home burned down in 2017 due to a faulty fire system.

We’re building the platform that will become the industry standard for construction-system design, and we’re looking for people who want to build foundational AI products that touch every building on the planet.

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

What you’ll work on

Our tech

You might be a great fit if you

Why join us

Apply Here: https://www.workatastartup.com/jobs/86167

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Founding AI Engineer