Interface Security Systems Jobs in California (NOW HIRING)

Apple's Security Engineering & Architecture organization protects the systems and experiences used by people around the world. The ML Security Engineering team brings together machine learning, systems security, and product engineering to help ensure that Apple Intelligence and other AI-powered experiences are secure, private, and trustworthy.
We are seeking an AI Systems Security Engineer to design, build, and deploy the security foundations for agentic and tool-using AI systems. You will develop the architectural controls that govern how agents access tools, services, memory, user data, and other privileged capabilities-and ensure those controls remain effective when models encounter malicious, untrusted, or adversarial inputs.
You will work closely with ML security researchers, AI/ML platform teams, operating-system engineers, product security, privacy, and product teams. Research will identify emerging attacks and promising defenses; you will translate those findings into robust platform capabilities, reusable frameworks, launch requirements, and production protections. Success in this role is measured by security properties that can be enforced, tested, observed, and maintained across shipping systems.
Description
Agentic AI systems introduce a new security boundary: probabilistic models interpret untrusted content while making decisions that can affect tools, data, and user-visible state. Securing these systems requires more than model-level safeguards. It requires carefully designed trust boundaries, least-privilege interfaces, execution controls, isolation mechanisms, and defense-in-depth across the complete AI system.
In this role, you will own critical elements of that security architecture. You will build systems that mediate agent actions, constrain authority, preserve data and instruction provenance, isolate untrusted execution, and prevent compromised model behavior from becoming unauthorized system behavior.
You will also develop the infrastructure needed to validate these protections continuously: adversarial integration tests, security invariants, policy conformance checks, telemetry, deployment gates, and tools for investigating failures. The solutions must meet demanding product requirements for latency, reliability, privacy, debuggability, and compatibility across Apple platforms and services.
Minimum Qualifications
Bachelor's degree in computer science, computer engineering, security, or a related field, or equivalent practical experience.
Significant experience designing and shipping security-critical systems, platform security mechanisms, or large-scale systems software.
Strong understanding of security architecture, trust boundaries, least privilege, authorization, isolation, secure execution, and defense-in-depth.
Demonstrated ability to convert threat models and security requirements into reliable production implementations.
Strong software engineering skills in one or more systems or platform languages, with experience building maintainable, testable, and performance-sensitive software.
Experience working across organizational boundaries to influence architecture and deliver security improvements in complex production systems.
Preferred Qualifications
Experience securing LLM-based, agentic, tool-using, or other probabilistic AI systems.
Experience with capability systems, sandboxing, policy engines, information-flow controls, provenance systems, secure IPC/RPC, or workload isolation.
Familiarity with attacks against agent systems, including prompt injection, unauthorized tool use, privilege escalation, data exfiltration, memory poisoning, and multi-stage attacks.
Experience building security evaluation infrastructure, fuzzing systems, adversarial test frameworks, runtime monitors, or automated release gates.
Experience securing operating systems, distributed systems, application platforms, cloud services, or privacy-sensitive consumer products.
Understanding of ML inference systems and the interaction between models, context construction, orchestration layers, retrieval systems, tools, and product code.
Ability to evaluate security designs against practical constraints such as latency, availability, privacy, compatibility, and diagnosability.
Track record of delivering foundational security mechanisms adopted by multiple products or engineering organizations.
Excellent written and verbal communication skills, including the ability to explain subtle security properties to research, engineering, and product audiences.