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    Thirdlayer

    B2B Software and Services

    Summer 2026 Full-Stack Engineer Intern

    San Francisco, United StatesOn-SiteInternship$6k – $10k / monthPosted 3mo ago
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    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.

    Job details are sourced from the employer's original posting.

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    About the company

    Thirdlayer

    Continual learning for enterprise AI

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    B2B Software and Services
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