ThirdLayer (YC W25) ยท 4 months ago
Summer 2026 Full-Stack Engineer Intern
San Francisco, CA, US
Internship
Onsite
Intern
Start in 2026 SummerThirdLayer 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
No H1B
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
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)
Applied research and product lab exploring the frontiers of memory, personalization, and intelligent interfaces. hiring@thirdlayer.inc
Founded in 2025
2-10 employees
Funding
Current Stage
Early StageLeadership Team
Regina Lin
Co-Founder, CEO
Kevin Gu
Co-Founder
Company data provided by crunchbase