# Full-Stack Engineer Intern 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: Internship
- Location: San Francisco, CA, US
- Work setup: On-site
- Posted: 2025-05-20
- Apply by: 2026-10-08
- Apply: https://www.ycombinator.com/companies/thirdlayer/jobs/1ZzDdz8-full-stack-engineer-intern
- Page: https://www.1752.vc/careers/jobs/thirdlayer-full-stack-engineer-intern/

## About the role

We're looking for engineers who can turn research prototypes into production-ready systems. You'll work at the intersection of browser automation, agent infrastructure, and intuitive UX that make complex agent behavior understandable and controllable.

## What they're looking for

- Strong foundation in React/Next.js and TypeScript
- Experience building and shipping complex web apps and/or browser extensions
- Familiarity with design systems like Figma or Framer
- Preferred: Proof of meaningful open-source contribution
- Preferred: Strong UI/UX or design portfolio

Tags: Engineering