About the role#
We are looking for engineers to turn research prototypes into production-ready systems. You will work at the intersection of browser automation, agent infrastructure, and intuitive UX. The goal is to make complex agent behavior understandable and controllable for users.
What you'll do#
- Build full-stack browser extension interfaces based on research prototypes.
- Implement end-to-end features using React, Next.js, Python, and SQL.
- Design intuitive interfaces for how users delegate and override AI actions.
- Integrate iMessage, communication channels, desktop-native tools, and wearables.
- Build reusable tool call and output components for LLM-generated responses.
- Develop efficient indexing, search, and memory layer architecture.
- Create security and guardrails to approve and deny agent requests.
- Integrate third-party platforms like Slack, Notion, and Gmail.
What you'll need#
- Strong foundation in React, Next.js, and TypeScript.
- Experience building and shipping complex web apps or browser extensions.
- Familiarity with design systems like Figma.
- A history of high-achieving projects or relevant work experience.
- Open source contributions or competitive experience in math, computer science, or physics.
- A strong UI/UX or design portfolio.
Location & details#
- Location: San Francisco, California, United States.
- Modality: On-site.
- Term: Rolling.
- Employment: Full-time.
- Compensation: $6,000 - $10,000 per month.
- Education: Computer Science, Mathematics, or Physics majors.
About ThirdLayer
ThirdLayer builds infrastructure for enterprise agents. The company focuses on continual learning systems that use organizational context to improve outcomes. Founded in 2025, the business operates out of San Francisco. It employs eight people.
How to get in at ThirdLayer
Applying to ThirdLayer early provides a distinct advantage because smaller teams review applications as they arrive. Intern Insider sends an instant alert the moment a role matching your target is published, helping you apply among the first before the candidate pile grows. You gain a better chance at being seen by the hiring team. Reaching out to the recruiter directly often improves your response rates compared to submitting into a queue. Intern Insider surfaces the recruiters behind ThirdLayer roles so you can contact them to ask about the position or a potential referral. This direct approach shows you are serious about the work.
