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Staff/Senior Engineer, AI Platform (Dex)

ThirdLayer· Engineering
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Remotefull-timePosted 2mo ago

About the role

Engineer focused on production AI systems and platform-scale, real-time context capture, agent orchestration, and evaluation infrastructure for ThirdLayer’s Dex platform.

Responsibilities

  • Own and evolve our context capture and learning pipeline, building new capabilities with customers and pulling patterns back into the platform.
  • Ship agent systems and AI-powered workflows from early prototype through production.
  • Partner with customers to find the highest-leverage problems and build solutions that stick.
  • Build agentic features that let agents learn from user behavior, adapt to new workflows, and take action on behalf of users.
  • Build evaluation and reliability infrastructure so we know when agents are ready to act autonomously vs. when they should ask.
  • Design systems that handle real-time ingestion and orchestration at scale.
  • Shape the technical direction of the product.

Qualifications

  • You've built production AI or LLM-based systems and can walk through the engineering tradeoffs in detail.
  • You've taken something from idea to production and can talk about how it changed along the way.
  • You're drawn to open-ended problems where the solution isn't handed to you.
  • Interest in how systems get smarter over time: feedback loops, prompt engineering, context design.
  • Experience building agents or autonomous systems.
  • As comfortable reading a paper as writing production code.
  • Strong communicator who can talk through technical decisions with both teammates and customers.

Skills

Required:Production AI/LLM systemsEnd-to-end product pipeline from idea to productionAgent systems / autonomous agents
Nice to have:Context design / feedback loops

Benefits

  • Not specified in the description
Last updated Oct 21, 2026. Interested? Apply on the company site.
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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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