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# Founding Security Software Engineer

- **Company:** SAGE RECRUITING, LLC
- **Location:** San Francisco, CA, United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Computer-Aided Design, Microsoft Windows, Artificial Intelligence, Software Applications, Data Structures, Programming Tools, Security Software, Concurrency, Production Code, Virtual Agents
- **Published:** November 6, 2026
- **Apply:** https://www.thejobnetwork.com/job/2b35b44b-4407-49b6-9271-8dc939e053a6/founding-security-software-engineer

## About the Role

* 7+ years of engineering experience, working at a staff or principal level
 * Rock-solid CS fundamentals: data structures, algorithms, concurrency, operating systems and systems design
 * Security controls you personally built and shipped: authorization, secrets, process isolation, sandboxing or network boundaries
 * Clear thinking about AI-specific threats like prompt injection, untrusted tool output and third-party extensions
 * The judgment to lead an ambiguous roadmap and explain security guarantees clearly to engineers and customer CISOs

Bonus points: desktop or Electron app security, Windows or native sandboxing, AI agent runtimes or developer tools, enterprise identity, customer-hosted or air-gapped deployments, or CAD/CAE/PLM exposure.

## Description

You'll be one of the company's first two security engineers and own its enterprise agent security from architecture to shipped code. The problem is largely unsolved: autonomous agents taking real actions inside native desktop software, on locked-down enterprise workstations, with some of the most valuable IP their customers have.

 * Own the threat model and security roadmap, and make the calls on priorities and release readiness
 * Secure agent execution on the desktop: sandboxing, scoped permissions, and approvals for consequential actions
 * Harden the desktop app and its deployment: privileged integrations, packaging, signed updates, supply chain
 * Build identity, credential and audit controls that pass security review at Fortune 100 and regulated customers
 * Report directly to the CTO as a hands-on IC. You'll write production code every week

This is a builder role. Our client wants a strong software engineer first and a strong security thinker second, not a security analyst or compliance specialist.