Founding Engineer, Agent and Data Systems

Apply on YC · Original job listing

• Role: Engineering / Full stack
• Experience: Any (new grads ok)
• Visa: Will sponsor
• Skills: Distributed Systems, Software Architecture, Data Warehousing, ETL, Data Modeling, LLMs, Evals, AI Agents, ClickHouse

About Tenor

Tenor (YC S26) is building the full-stack infrastructure for AI-native businesses, redefining how companies are built, launched, and scaled in the 21st century. We're a four-person, seed-stage startup hiring our fifth teammate. Our team brings together engineering, ML, and product experience from Tesla, Waymo, Amazon, UC Berkeley, and Stanford, including research published at ICML.

The role

We are hiring a founding engineer with end-to-end ownership across agent, data, backend, and product systems. You will engineer harnesses across our agent systems, including tool-use loops, evidence-driven learning systems, replay and simulation infrastructure, evaluation and promotion gates, and the backend and full-stack product systems that hold everything together.

You will work directly with the founders to turn prototypes into reliable product infrastructure and shape both the technical architecture and the product.

What you will have ownership in

• Design and operate reliable agent harnesses, execution systems, replay and simulation infrastructure, and evaluation and promotion gates.

• Build backend systems for orchestration, state, versioning, observability, and reliability.

• Build data systems, including pipelines, ETL, data modeling, and warehousing.

• Ship full-stack product features across APIs, services, and user-facing workflows.

• Work closely with customers and the founding team to identify problems, test ideas, and ship quickly.

What we are looking for