Founding Chromium Engineer at cmux

About the role

What will you do at cmux?

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. Check us out at cmux.com and on GitHub.

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

Which skills does this role require?

C++

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