Senior Security Engineer

This is a senior individual contributor role owning application security for a rapidly scaling multi-tenant AI agent platform that serves enterprise customers. You will sit at the intersection of product engineering and security embedding secure practices across the full software development lifecycle. The work directly protects sensitive customer data at scale and shapes how a fast-growing AI company builds security culture from the ground up.

• Design and implement application security controls across a multi-tenant AI platform including secure coding practices threat modeling and vulnerability management.
• Partner closely with product engineering teams to integrate security from design through deployment.
• Build security tooling and automation that helps developers ship quickly while identifying and remediating vulnerabilities fast.
• Lead security code reviews and architecture assessments for new features with a focus on AI model integration points and customer data handling.
• Respond to security incidents involving application vulnerabilities and drive post-incident improvements.

• 4 years of combined software engineering and hands-on application or infrastructure security experience ideally at a high-growth company or well-funded startup.
• Strong software engineering foundation either transitioning into security or already working as an AppSec engineer in a fast-paced environment.
• Practical security engineering experience not a pure compliance or GRC background.
• Experience with GCP or AWS cloud security.
• Familiarity with security tooling across the stack: SAST DAST IAST container security Semgrep or CodeQL.
• Comfort working within Python-based codebases and cloud-native infrastructure (Kubernetes CI/CD pipelines).
• Strong CS fundamentals ideally from a rigorous undergraduate program.
• Background as an early or founding security engineer at a VC-backed company is a plus.
• Demonstrated rapid career progression or early promotion is a plus.

Base salary range: $200000 to $330000 USD annually plus equity. Visa sponsorship is not available for this role.

This role is on-site five days per week in San Francisco CA.