Product Engineer Intern
About the role
Product engineer intern role focused on building software with clean architecture, thoughtful API design, and strong typing. Collaborate across browser extension, web surfaces, and platform to ship features and improve user interactions with agents.
Responsibilities
- Ship product and talk to users. Build performant, beautiful experiences that people genuinely enjoy using.
- Own features end-to-end: gather context, scope the work, build it, ship it, and make sure it holds up.
- Define how users interact with agents across our surfaces.
- Build shared libraries, component systems, and internal tooling that make the rest of the team more productive.
- Work closely with the team on product direction, understand how customers use what you build, and let that shape what you build next.
- Build integrations and data pipelines that connect our platform to external systems.
Qualifications
- A strong engineer with attention to detail, thoughtful about UX, and deeply empathetic toward users.
- Strong fundamentals in TypeScript and/or Python. You write well-typed, well-structured code and take pride in it.
- You've built and shipped real software, whether personal projects, open source, or at a company.
- You're at your best when you own a problem end-to-end, comfortable with ambiguity and energized by turning vague asks into clean solutions.
- Good visual and interaction judgment, even if you're not a designer by title.
- Willingness to move fast and grow quickly in a rapidly changing environment.
- Strong communicator who can work closely with teammates and customers.
Skills
About ThirdLayer
Building Dex, the AI Browser Copilot
ThirdLayer is an applied research and product lab building the next interface for human–AI collaboration. Our first product is Dex, an AI copilot for the browser. Think Cursor for knowledge work, optimized for speed and embedded directly where you work. Most web agents are built for set-and-forget tasks. But real work is fluid and messy—spread across tabs, tools, and evolving decisions. Dex transforms your browser into an intelligent, multimodal workspace that understands your intent through voice, text, and action. It enhances familiar interfaces, automates tedious steps, and removes the friction of handoffs. Beneath the surface, Dex is more than a browser agent — it’s a foundation for: ● Long-term, cross-modal memory grounded in real workflows ● A new interaction layer to replace static UI with a collaborative canvas ● Personalization: understanding how individuals approach tasks and navigate software We're building the infrastructure for adaptive, intent-aware systems that work the way you do.
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