S

Staff macOS Systems Engineer (Founding Team)

stealth ai startup (la/sf) • Los Angeles Metropolitan Area
Visa Sponsorship Relocation
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Technical lead responsible for the architecture and systems-level development of a native Mac AI application. Owns the entire macOS lifecycle including background services, sandboxing, signing, and distribution. Requires 10+ years of software engineering experience with deep expertise in Swift and macOS internals.

Key Highlights
Founding team member at a pre-seed AI startup
Technical leadership across both Mac and iOS engineering teams
End-to-end ownership of Mac app distribution, signing, and notarization
Key Responsibilities
Set technical direction and maintain quality standards for Mac and iOS code through design and code reviews.
Define and own the architecture of the Mac app, including interfaces and performance limits.
Write and maintain core macOS systems code in Swift.
Mentor engineers, interview candidates, and assist in hiring decisions.
Lead release cycles, including scheduling, criteria, and go/no-go recommendations.
Manage Mac distribution via the Mac App Store and direct downloads, including signing, notarization, and updates.
Technical Skills Required
Swift macOS XPC
Benefits & Perks
Competitive salary
Relocation assistance
Great benefits
Equity
Visa support
Nice to Have
Experience shipping the same app as both Mac App Store and direct-download editions
Experience with Core ML, Metal, or Accelerate
Experience using Instruments for allocations, energy, and signposts
Experience shipping SwiftUI and AppKit side by side in production
Experience managing releases for teams of 15 or more engineers

Job Description

About

We're a stealth AI startup building an agentic AI product and assembling our founding team in LA/SF. We're pre-seed funded and heads-down until launch. Full details are shared under NDA once we connect. We offer competitive salary, relocation assistance, great benefits, and equity, and visa support.

Description

This is a Mac systems role: you'll own what runs underneath the app (its processes, background services, sandboxing, signing and distribution), not only the app's interface. You'll be the technical lead for engineers across Mac and iOS, and write much of the hardest code yourself.

In this role, you will:

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