About the role#
ThirdLayer is looking for engineers to turn research prototypes into production-ready systems. You will work at the intersection of browser automation and agent infrastructure. Your goal is to build intuitive interfaces that make complex agent behavior understandable and controllable.
What you'll do#
- Build full-stack browser extension interfaces using research prototypes.
- Develop end-to-end features with React, Next.js, Python, and SQL.
- Create intuitive frontend systems.
- Develop reusable tool call and output components for LLM-generated responses.
- Build efficient indexing, search, and memory layer architecture.
- Create security and guardrails to manage agent requests.
- Integrate third-party platforms like Slack, Notion, and Gmail to enable workflows.
What you'll need#
- Strong foundation in React, Next.js, and TypeScript.
- Experience building and shipping complex web applications or browser extensions.
- Familiarity with design systems such as Figma or Framer.
- A strong UI/UX or design portfolio is preferred.
- Meaningful open-source contributions are a plus.
Location & details#
- Location: San Francisco, California, United States.
- Modality: On-site.
- Term: Rolling.
- Compensation: $5.2K to $10.4K monthly.
- Employment: Full-time internship.
- Note: Sponsorship is not available.
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.
