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Full-Stack Engineer Intern

Thirdlayer

San Francisco, CAInternshipSeen 1mo agoStill listed 2 days ago

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At a glance

Compensation
No compensation found
Location
San Francisco, CA
Role Type
Internship
Schedule
Internship
Work Authorization
Not specified

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Job overview

Thirdlayer is seeking a Full‑Stack Engineer Intern to transform research prototypes into production‑ready systems, focusing on browser automation, agent infrastructure, and intuitive user experiences. The role involves building full‑stack browser extensions, end‑to‑end features with React/Next.js, Python, and SQL, and crafting beautiful frontend interfaces.

Skills & qualifications

RequiredNice to have

Skills

PythonReactTypeScriptTailwindReact/Next.jsSQLFigmaFramerBrowser ExtensionsDesign SystemsFullstack Development

Full job description

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 You'll Build

  • Fullstack browser extension interfaces based on research prototypes.
  • End-to-end features using React/Next.js, Python, and SQL.
  • Beautiful and intuitive frontend systems.

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

Sample Projects

  • 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.
  • Integrating third-party platforms (e.g. Slack, Notion, Gmail) to enable workflows.

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