As a Staff Software Engineer at Atomus, you will build the core engines of a multi-platform security ecosystem protecting the nation’s most sensitive defense technologies. You will bridge the gap between desktop agents and cloud infrastructure while shaping the engineering foundations of a high-stakes, mission-driven startup during its most critical growth phase.
Staff Software Engineer (Early Product) at Atomus
Atomus is securing the future of national defense, protecting over 100 organizations like the US Air Force and Navy from sophisticated cyber threats. As a Staff Software Engineer, you'll join a high-impact founding team in San Francisco to build the core engines behind their multi-platform security systems. This is a rare opportunity to tackle deep engineering challenges across Windows, macOS, and cloud infrastructure for customers building hypersonic aircraft and satellites. If you have 7+ years of experience and want your code to protect the country's most critical technology, this is the seat for you.
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Location
San Francisco, United States
Compensation
Not Disclosed
Company
Atomus
Role overview
Atomus (Atomus Corporation) is a technology-driven managed security service provider and cybersecurity software company purpose-built for the aerospace and defense sector.[11][12] Founded in 2019 as part of a Department of Defense initiative to research and develop cutting-edge cybersecurity, Atomus focuses on helping small and mid-sized aerospace and defense businesses meet stringent U.S. government cybersecurity requirements.[7][12] Its flagship product, Atomus Aegis, is a cybersecurity software platform that makes compliance with NIST 800-171, DFARS 7012, and CMMC requirements easier by providing automated controls, monitoring, and guidance tailored to defense contractors.[7][3][5] Through a combination of software and managed security services, Atomus delivers “cybersecurity as a service” to protect sensitive defense-related data and maintain regulatory compliance across the defense industrial base.[11][10]
What you will do
- Architect and build the core infrastructure that senses, correlates, and acts across diverse customer security environments to ensure total protection.
- Develop and harden a multi-platform desktop agent at fleet scale, ensuring it remains unbreakable across Windows, macOS, and Linux distributions.
- Collaborate directly with founders to define engineering patterns, shipping culture, and product strategy as the team scales from early stage to industry leader.
Who this is a fit for
- 7+ years of experience building production-grade software, specifically customer-facing SaaS platforms or sophisticated multi-platform desktop applications and agents.
- Expertise in diving deep into system behavior and low-level interactions to understand why software behaves the way it does across different environments.
- A fast-moving, ownership-oriented mindset that thrives on ambiguity and the challenge of building foundational systems from a blank page.
Why this role is remarkable
- Join a mission-critical team protecting the organizations building hypersonic aircraft, satellites, and autonomous defense platforms essential to national security.
- Work on a product with massive traction, already securing 100+ customers including the US Air Force and Navy, while still operating as a small, high-impact founding team.
- Tackle unique engineering challenges across Windows, macOS, and Ubuntu while developing next-generation agentic systems that automate complex security reasoning.
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What happens next?
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Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If your profile’s a match and Atomus wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.