# Founding Engineer at Thirdlayer

- Company: Thirdlayer (YC W25)
- What the company does: Continual learning for enterprise AI. Backed by Y Combinator.
- Company website: https://thirdlayer.inc
- Type: Startups (AI role)
- Level: Mid level
- Location: San Francisco, CA, US
- Work setup: On-site
- Pay: $130K to $250K base salary per year (USD)
- Posted: 2025-05-20
- Apply by: 2026-10-08
- Apply: https://www.ycombinator.com/companies/thirdlayer/jobs/qYNyl01-founding-engineer
- Page: https://www.1752.vc/careers/jobs/thirdlayer-founding-engineer/

## About the role

We're creating the third layer of interaction — a personalized AI action layer that lives across all your workflows. If that excites you, and you’re a world-class infrastructure expert, please apply.

## What they're looking for

- Expert in React/Next.js, TypeScript, and Python
- Deep browser internals experience
- Proven rapid prototype to production track record
- Preferred: Prior experience with AI/ML infra or agentic systems

Tags: Engineering