Summer 2026 Full-Stack Engineer Intern jobs in United States
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ThirdLayer (YC W25) ยท 4 months ago

Summer 2026 Full-Stack Engineer Intern

positionSan Francisco, CA, US
timeInternship
remoteOnsite
seniorityIntern
workcardStart in 2026 Summer

ThirdLayer is a company focused on engineering innovative solutions, and they are seeking a Summer 2026 Full-Stack Engineer Intern to help turn research prototypes into production-ready systems. The intern will work on developing full-stack browser extension interfaces and designing intuitive user experiences for AI delegation and control.

Artificial Intelligence (AI)Information TechnologyProduct Design
badNo H1Bnote

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

Qualification

ReactNext.jsTypeScriptPythonSQLUI/UX designFigmaOpen-source contribution

Required

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

History of high-achieving projects/work experience, open source contributions, or competitive math/cs/physics experience
Proof of meaningful open-source contribution
Strong UI/UX or design portfolio

Company

ThirdLayer (YC W25)

twittertwitter
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Applied research and product lab exploring the frontiers of memory, personalization, and intelligent interfaces. hiring@thirdlayer.inc
dateFounded in 2025
location
San Francisco, California, USA
people-size2-10 employees
web-link
https://www.thirdlayer.inc

Funding

Current Stage
Early Stage

Leadership Team

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Regina Lin
Co-Founder, CEO
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Kevin Gu
Co-Founder
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Company data provided by crunchbase