Software Engineer, CUA Control

Control Layer Engineer

We're looking for an engineer to work on the control layer - the system that translates an AI model's intent into precise, reliable actions on a real computer. This means mouse movements, keyboard input, window management, UI element detection, and error recovery across macOS, Windows, and Linux.

What you'll do

• Work on the low-level computer control stack: mouse/keyboard injection, screen capture, coordinate mapping, input simulation
• Implement UI element detection using accessibility APIs (AXUIElement, UI Automation), DOM/a11y trees, and visual grounding
• Help build the abstraction layer that lets our agent operate across OS platforms and application types
• Tackle reliability problems: element targeting under UI changes, window occlusion, resolution scaling, cross-app focus management
• Contribute to feedback loops: how does the agent know its action worked? How does it recover when something unexpected happens?
• Work closely with the model and planning team on the interface between intent and execution

You might be a fit if

• You've built OS-level input automation (CGEvent, SendInput, xdotool, or similar)
• You understand accessibility frameworks - AXUIElement on macOS, UI Automation on Windows, AT-SPI on Linux
• You've dealt with flaky element selectors, timing issues, resolution-dependent coordinates
• You think carefully about reliability and edge cases
• You've worked with tools like Playwright, Appium, PyAutoGUI, Hammerspoon, or similar

Bonus

Experience with screen reader internals, remote desktop protocols (RDP/VNC), game automation, LLM agent tool-use systems, or mobile device automation (iOS UIAutomation / XCTest, Android UIAutomator / Accessibility).