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ThirdLayer- YC(W25) Logo

Full-Stack Engineer Intern

ThirdLayer- YC(W25)

Salary not specified
Aug 30, 2025
San Francisco, CA, US
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Reimagining the browser as an intelligent workspace that understands user actions and enhances productivity through AI integration.

Requirements

  • 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
  • Proof of meaningful open-source contribution.
  • Strong UI/UX or design portfolio.

Responsibilities

  • Full-stack browser extension interfaces based on research prototypes.
  • End-to-end features using React/Next.js, Python, and SQL.
  • Design intuitive interfaces for how users should delegate and override AI actions.
  • iMessage, communications channels, desktop-native, wearables integrations
  • Reusable tool call and output components for LLM-generated responses.
  • Building efficient indexing, search, and memory layer architecture.
  • Developing security and guardrails to approve and deny agent requests.

Other

  • US citizen/visa only
  • History of high-achieving projects/work experience, open source contributions, or competitive math/cs/physics experience.