Founding Chromium Engineer

cmux is a native macOS terminal built on Ghostty, designed for running multiple AI coding agents in parallel. Hundreds of thousands of developers use cmux to drive their agentic coding workflows.

We're hiring a founding engineer to own cmux on Windows (and Linux) - built on our own fork of Chromium.

What you'll do

• Own our Chromium fork: track upstream, rebase cleanly, carry cmux patches (window/input/render integration, terminal surface, agent UI)
• Own cmux on Windows/Linux end to end: C++, installer, auto-update, crash reporting
• Port the Ghostty-based terminal core and agent-orchestration features (vertical tabs, notification rings, splits, CLI) to Windows
• Make performance feel native: startup time, GPU rendering, input latency
• Dogfood, test, and verify constantly

Who we're looking for

• Deep C++ and real Chromium work - ideally you've maintained a fork: carrying patches, rebasing on upstream milestones, debugging in content/ or blink
• Rust a big plus (our TUI and networking daemon are Rust)
• You've shipped or maintained a real Windows desktop app
• Bonus: upstream Chromium contributions, Swift/AppKit curiosity, open-source maintainer, former founder

Details

• Compensation: $130k - $170k + 0.5% - 1.5% equity
• Benefits: Health, dental, and vision insurance
• Location: San Francisco