Senior Security Engineer, AI Security

Role Description

Reddit is hiring a Senior Security Engineer, AI Security to help teams build and ship AI-powered products securely. This role combines product security judgment with hands-on engineering to secure the systems, tools, and workflows behind Reddit's AI efforts.

• Review AI-powered product designs, threat model LLM and agentic workflows.
• Build reusable security primitives that make secure AI development easier for teams across Reddit.
• Design security tooling 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.
• Proactively find, fix, and prevent AI security issues.
• Turn one-off AI security issues into systemic fixes and reusable guidance.

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.
• Ability to reason across trust boundaries.
• Practical understanding of infrastructure security concepts.
• Strong engineering judgment about when to block launch and how to sequence practical remediations.
• Clear communication skills with the ability to explain technical security risk and business impact.

Requirements

• Experience securing AI/LLM products, AI-assisted development tooling, agent frameworks, or model-integrated workflows.
• Experience building guardrails, policy engines, secure frameworks, scanners, or other developer-facing security platforms.
• Familiarity with agent sandboxing, workload identity, network policy, or AI red teaming.
• Experience scanning or governing AI agent components.
• Familiarity with machine learning systems, model evaluation, or data governance for AI products.
• Experience with Go, Python, JavaScript, or TypeScript.
• Experience partnering with privacy, trust and safety, infrastructure, platform, or machine learning teams.
• Hands-on experience securing distributed systems or cloud-native applications.
• Track record of mentoring engineers or raising the security bar through guidance, tooling, or reusable patterns.

Benefits

• Medical, dental, and vision insurance.
• 401(k) program with employer match.
• Generous time off for vacation.
• Parental leave.