Security Software Engineer

PSI; San Francisco (CA); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Health Care Plan (Medical, Dental &amp

Retirement Plan (401k, IRA)

Life Insurance (Basic, Voluntary &

Paid Time Off (Vacation, Sick &)

Family Leave (Maternity, Paternity)

Short Term & Long Term Disability

Training & Development

Job summary

PSI is hiring a senior security engineer to shape the security architecture for its AI agent platform. You will directly influence how agents operate, enforce controls, and protect customer data across multi-tenant services.

You will own threat modeling, build sandboxed execution capabilities, and drive secure identity and data handling. This senior IC role interfaces with engineering leadership to ship secure solutions in a fast-paced environment.

Qualifications

• Production systems you personally designed, built, and shipped.
• Strong CS fundamentals: algorithms, concurrency, OS, systems design.
• Hands-on security engineering: authorization, secrets management, process isolation or network security.
• Comfort debugging across backend services and OS layers.
• Clear thinking on AI-specific risks such as prompt injection and untrusted model output.
• Ability to prioritize and own outcomes in a fast-moving environment.

Responsibilities

• Own threat model and security roadmap for the agent platform.
• Design and build controls limiting agent actions, including permissions and sandboxed execution.
• Develop secure identity, credential, and data handling across services and tenants.
• Harden packaging, updates, and release processes for security.
• Write security-focused tests, investigate vulnerabilities, and lead incident response engineering.
• Partner with product engineers and support customers through security reviews.

Skills

Software engineering

CS fundamentals

Security engineering

Debugging

AI security

Prioritization

Job description

Our client is an AI company building autonomous agents for enterprise customers. Their agents handle sensitive customer data and take real actions inside business-critical software, so security sits at the center of how the product earns trust and wins larger accounts.

This is a senior, hands-on individual contributor role with a direct line to engineering leadership. You will shape the security architecture for the agent platform and write much of the code that enforces it.

What You'll Do

• Own the threat model and security roadmap for the agent platform
• Design and build controls that limit what agents can do, including permissions, approvals, and sandboxed execution
• Develop secure identity, credential, and data handling across services and tenants
• Harden application packaging, updates, and release processes
• Write security-focused tests, investigate vulnerabilities, and lead incident response engineering
• Partner with product engineers and support customers through security reviews

What You Bring

• Strong software engineering background: production systems you personally designed, built, and shipped
• Solid CS fundamentals: algorithms, concurrency, operating systems, and systems design
• Hands-on security engineering: authorization, secrets management, process isolation, or network security
• Comfort debugging across backend services and operating system layers
• Clear thinking on AI-specific risks such as prompt injection and untrusted model output
• Ability to prioritize and own outcomes in an ambiguous, fast-moving environment

Nice to Have

• Python, TypeScript, or Rust
• Desktop application or endpoint security experience
• Experience with AI agents, agent tooling, or developer tools
• Enterprise identity, on-prem, or restricted-network deployments

Why is This a Great Opportunity

• Tackle new, high-impact problems in AI agent security
• Set the security architecture and engineering standards for the company
• Work closely with leadership and see your decisions ship quickly

• Health Care Plan (Medical, Dental & Vision)
• Retirement Plan (401k, IRA)
• Life Insurance (Basic, Voluntary & AD&D)
• Paid Time Off (Vacation, Sick & Public Holidays)
• Family Leave (Maternity, Paternity)
• Short Term & Long Term Disability
• Training & Development