AI Security Engineer: Threat-Guard for AI

Reddit, Inc.; San Francisco (CA); On-site; USD 190,800 - 267,100; Full time

Job summary

Reddit, Inc. is seeking a Senior Security Engineer, AI Security to help teams build and ship AI-powered products securely. You will review AI‑powered designs, threat model LLM workflows, and build reusable security primitives that scale across Reddit.

This role combines product security judgment with engineering to secure AI systems and workflows behind Reddit's AI efforts. The ideal candidate has deep experience in application security, building backend services, and practical remediation, with

Qualifications

• 5+ years of experience in product security, application security, software security, security engineering, backend engineering, or security platform engineering.
• Strong application security fundamentals, including secure design review, threat modeling, code review, vulnerability prioritization, and practical remediation.
• Experience in building reliable backend services.
• Hands‑on experience building security automation, developer tooling, libraries, infrastructure, or platform controls.
• Familiarity with AI, LLM, or agentic system risks such as prompt injection and data leakage.
• Ability to reason across trust boundaries, including user input, model context, retrieval systems, backend services, tool calls, and third‑party integrations.

Responsibilities

• Review and threat model AI‑powered product features, LLM integrations, agentic workflows, MCP servers, tools, plugins, retrieval systems, model outputs, and internal AI tools before launch.
• Build reusable AI security primitives such as guardrails, scanners, policy checks, tool‑use controls, registries, sandboxes, libraries, and workflow‑native enforcement points.
• Design security tooling that can sit in the inference, retrieval, or execution path to detect and prevent prompt injection, jailbreaks, tool misuse, data leakage, unsafe code generation, and suspicious agent behavior.
• Partner with teams building products and platforms with AI to define practical security controls that fit how they design, build, and ship.
• Proactively find, fix, and prevent AI security issues, while making any required product or engineering changes clear and low‑friction for partner teams.
• Turn one‑off AI security issues into systemic fixes, paved paths, measurable controls, and reusable guidance.

Skills

Application security

Threat modeling

Code review

Vulnerability remediation

Backend services

Security automation

Developer tooling

Kubernetes

Go/Python/JS/TS

Communication

Tools

Kubernetes

CI/CD tooling

Security scanners

Policy engines

Job description

Reddit, Inc. is seeking a Senior Security Engineer, AI Security to help teams build and ship AI-powered products securely. You will review AI‑powered designs, threat model LLM workflows, and build reusable security primitives that scale across Reddit.

This role combines product security judgment with engineering to secure AI systems and workflows behind Reddit's AI efforts. The ideal candidate has deep experience in application security, building backend services, and practical remediation, with