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Summer 2026 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 seeks a Summer 2026 Full‑Stack Engineer Intern to turn research prototypes into production‑ready systems, focusing on browser automation, agent infrastructure, and intuitive UX for complex agent behavior.

Skills & qualifications

RequiredNice to have

Skills

React/Next.jsTypeScriptPythonSQLFigmaBrowser ExtensionsOpen‑Source ContributionUI/UX Design Portfolio

Full job description

Full-Stack Engineer Intern 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. Preferred: History of high-achieving projects/work experience, open source contributions, or competitive math/cs/physics experience. What You'll Do

  • 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

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
  • 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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