Thirdlayer
Summer 2026 Full-Stack Engineer Intern
- Compensation
- Not disclosed
- Location
- US
- Work setup
- Onsite
- Seniority
- Intern
- Employment
- Internship
- Experience
- Not specified
- Category
- Fullstack
- Posted
Skills
Must have
- 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.
Full 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.