Software Engineer, Full Stack

$160k – $220k • 0.2% – 0.6%

Skip this job application if you’re looking for an easy calling.

Read on if you’re a hacker-minded engineer who ships weekly, owns problems end-to-end, and performs best in uncharted waters.

Humanity needs a defense layer against increasingly intelligent machines around us. Without it, the systems and devices we rely on can—and will—turn against us.

Join Sweep to build that layer and safeguard the freedoms that let people live, work, travel, create, and operate in a rapidly shifting world.

As our Full Stack Engineer, you’ll deploy systems that already protect some of the world’s highest-stakes teams. From decision-makers to elite market-movers and frontline journalists, to chart-topping artists, record-breaking athletes, and history-bending scientists.
Together, we’ll redefine cyber-physical security for the AI age.

Why You Should Join

• Mission & Impact – Operate with the intensity of Bletchley-Park—high stakes, rapid tempo, where mission-failure is not an option. Deploy code in support of missions and in places you’ll never discuss, but never forget.

• Innovation Ground-Zero – Push the frontier of mobile, spatial intelligence, IoT sensors, RF, and on-device AI. You’ll invent net-new capabilities, not just iterate.

• Founding Ownership – Join the first ten engineers, shape culture and standards, and build the security layer that defines how humans stay in control of autonomous machines.

What You’ll Do

• Build mission-critical full-stack systems across mobile, web, and backend.

• Deploy secure cloud infra (AWS/GCP) and edge AI for real-time defense.

• Integrate LLMs, graph reasoning, and sensor fusion for threat detection.

• Own reliability through testing, automation, and tight feedback loops.

• Directly engage elite users around the world—expect about 10-15% global travel.

Must-Have

• Polyglot developer (JS, Python, Rust/Go a plus) who rapidly picks up new languages.

• Deep cloud expertise (AWS/GCP) in secure, scalable deployment.

• 5+ years shipping systems that cannot fail production code.

• Worked with LLMs, vector databases, and prompt pipelines.

• Startup urgency: Independent, accountable, relentless execution. U.S. Person status required (may involve export-controlled data).

Nice-to-Have

• Experience building iOS applications.

• IoT, spatial computing experience (BLE/WiFi, AR/VR).

• Code-quality obsession (SonarQube or similar).

• Experience building secure operational dashboards or admin workflows

• Proven record optimizing database performance under scale.

Compensation

Base salary for this position is up to $220,000 annually, depending on your qualifications, experience, and impact. Total compensation also includes equity, premium insurance, and individual benefits.

Why Sweep?

Sweep selects for mission, impact, ownership. Face-to-face collaboration is how we operate, thrive, and deliver. You’ll join us on-site at our NYC HQ or Hybrid in DC, London/Cambridge, UK.

Selection Process

Initial 20-min intro → technical deep-dive → team exercise → references → offer.
Additional questions? Just ask.

This is civilizational infrastructure. If you want to build toys this might not be for you. But if you want to help stop the next existential threat, step forward.

Make history. Build humanity’s defense against machines.

Apply via Wellfound