Founding Engineer
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Before you apply
Salary$130k – $170k
LocationSan Francisco, California, US
Work modeon-site
Typefull-time
SeniorityLead
EquityIncluded
Company size1–10 people
First seenSep 30, 2026 · 1mo ago
Verified live1d ago
At a glanceSummarised by Seekless from the posting.
Talented builder from any background
Uses 10B+ tokens a day
All-rounders and creative problem solvers
Great design taste and care for the craft
Swift/AppKit experience
C++ experience
Rust experience
Go experience
Chromium experience
Open-source maintainers, former founders, people who ship complete products
Sending cmux PRs for review or demoing custom cmux plugins/workflows
Skills
Swift
AppKit
Rust
C++
Chromium
Go
Benefits
Health insurance
Dental insurance
Vision insurance
About the company
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 talented founding engineers to help us build the future of coding with AI.
What you’ll do
•
Build frontier devtools across the stack: cmux macOS (Swift/AppKit), cmux TUI (Rust), cmux Windows/Linux (C++/Chromium), cmux iOS, cmux Cloud, subrouter (Go), chatmux, and more
•
Help invent the most useful product for developers to do work with AI
•
Own products and features end to end, including user feedback loops
•
Dogfood, test, and verify constantly; use cmux to build cmux
Who we’re looking for
No hard requirements. We want talented builders from any background.
Nice to have
Things that make us extra excited:
•
You use 10B+ tokens a day
•
All-rounders and creative problem solvers
•
Great design taste and care for the craft
•
Swift/AppKit, C++, Rust, Go, or Chromium experience
•
Open-source maintainers, former founders, people who ship complete products
•
Sending cmux PRs for us to review or demoing custom cmux plugins / workflows
Details
•
Compensation: 130k - 170k + 0.5% - 1.5% equity
•
Benefits: Health, dental, and vision insurance
•
Location: San Francisco
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