Member of Technical Staff, Security

Threeum

Threeum is a frontier company building physical AI. We design the model and the machine as one system, so the full loop of training, deployment, and improvement runs faster, more capable, and more autonomous. Our goal is to make frontier AI physical, and to make it widely accessible.

The Role

We are looking for an engineer to secure machines that live in the world: device identity, update integrity, tenant isolation, and the threat model of hardware anyone can touch.

Some example areas you might work on (not limited to):

• Build attestation, signed updates, and key management for a physically exposed fleet
• Design isolation between tenants who share hardware they do not own
• Red-team the agent harness and the paths from model output to physical action

If you want to build the machines the models deserve, we would love to hear from you.

We offer a base salary of $250,000 to $400,000 USD and a meaningful equity grant, depending on experience and background, along with competitive benefits.