Senior Software Security Engineer

The role

You will build the security function from the ground up by writing and shipping production code. You will work on secure design, identity and secrets management, infrastructure security, and agentic AI security.

What you will do

• Partner with engineering to find risks and build secure frameworks and libraries.
• Build and maintain identity and secrets management systems.
• Harden cloud security controls and contribute to continuous cloud security posture management.
• Build the security model for AI agents.
• Design permission boundaries for agents.
• Harden agents against prompt injection.
• Ensure strict tenant isolation across the agentic platform.
• Raise the security bar through design reviews and coaching.

Required qualifications

• 5+ years of experience as a software engineer, shipping production services, libraries, or platforms.
• Experience leading a security initiative from design through adoption.
• Hands-on experience with identity and secrets management, including OAuth 2.0 and OIDC.
• Familiarity with Kubernetes security primitives, including RBAC, namespaces, network policies, and admission controllers.
• Ability to reason clearly about trust boundaries and threat models.

Nice to have

• Experience with developer security tooling such as SAST, dependency scanning, or secure build infrastructure.
• Experience with SAML or SPIFFE/SPIRE, or building workload authentication systems from scratch.
• Experience securing LLM-based or agentic systems.

Benefits

• Competitive compensation packages with meaningful ownership
• Flexible PTO
• 401k
• Wellness benefits, including a bundle of free therapy sessions
• Technology & Work from Home reimbursement
• Flexible work schedules

About the company

Fieldguide builds software for the people who enable trust between businesses by automating the work of assurance and audit practitioners. They are based in San Francisco and built remote-first.