Each major shift in computing has come from a better way to interact with machines.
Hardware gave us the foundation. Operating systems made machines programmable. Graphical interfaces made them usable.
Today's interfaces weren't built for intelligence. They can't adapt, anticipate, or understand real context.
The next leap isn't just about better models. It's about a new kind of interface that works the way you think.
AI is advancing fast, but the interface hasn't kept up.
The most powerful models are still stuck behind static UIs and prompt boxes, while real work lives across tabs, tools, and passing thoughts.
Every context switch breaks focus. Every restart slows you down.
The browser has become a bottleneck. UI adds friction. Apps forget everything about your workflow. And every AI platform is yet another silo — locked in chats, dashboards, or closed ecosystems.
We think that's backwards.
Dex is a context engine for AI-native work.
Like an extension of your mind, Dex embeds directly into your workflows, turning your entire web workspace into an intelligent, proactive system. It recognizes your intent, remembers your preferences, and helps you move with speed and clarity — without switching between tools.
Behind the scenes, we're solving these core problems:
- Multiagent orchestration — coordinated sub-agents mixing tool-use and browser control
- Living memory — a context engine that learns workflows, denoises actions, and retrieves with precision
- Intent-aware perception — linking on-screen state to user goals, powering adaptive, intelligent interfaces
- Trajectory prediction — predicting personalized action flows into full workflows that build trust
We're building systems that extend how you think and move. Augmenting you, not replacing you.
Dex works with you, not around you. It enhances the tools you already use and becomes a bridge between thought and action.
ThirdLayer is where research meets product design.
We're an applied research and product lab backed by Y Combinator and leading investors in deep tech, HCI, and consumer tech.
Our team has experience and received offers from top quant trading firms, frontier labs, and academic labs. We work with advisors and collaborators in research and design from MIT Media Lab, Stanford SAIL, Berkeley BAIR, Sakana AI, DeepMind, and Eleven Labs.
If you're exploring adjacent questions in HCI, long-term context, multiagent architectures, generative UI, or intent prediction, we'd love to connect.
Join us.
We're looking for exceptional builders and operators who can drive bold ideas from research to execution.
Open Roles