Senior Security Engineer, AI Security

Job Overview

Reddit is a community of communities. It’s built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about.

With 100,000+ active communities and approximately 130 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit www. redditinc. com . About The Role Reddit is a community of communities.

Job Description

It is built on shared interests, passion, and trust and is home to some of the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about.

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.

This is not an MLE role, but you should be comfortable reasoning about how AI systems fail, how agents use tools, and how security controls fit into inference, retrieval, tool-use, and execution paths.

They can identify risks before launch, then turn repeated findings into guardrails, scanners, registries, sandboxes, libraries, policy checks, or platform controls that scale beyond one product team.

What You'll Do 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.

Key Responsibilities

• Reddit is hiring a Senior Security Engineer, AI Security to help teams build and ship AI-powered products securely.
• You will review AI-powered product designs, threat model LLM and agentic workflows, and build reusable security primitives that make secure AI development easier for teams across Reddit.
• The best candidates combine practical application security judgment with strong builder instincts.
• Build reusable AI security primitives such as guardrails, scanners, policy checks, tool-use controls, registries, sandboxes, libraries, and workflow-native enforcement points.
• Partner with teams building products and platforms with AI to define practical security controls that fit how they design, build, and ship.
• Experience in building reliable backend services.
• Hands-on experience building security automation, developer tooling, libraries, infrastructure, or platform controls.
• Clear communication skills with the ability to explain technical security risk and business impact to engineers, product managers, and leadership.

Required Skills and Qualifications

• Proactively find, fix, and prevent AI security issues, while making any required product or engineering changes clear and low-friction for partner teams.
• What We're Looking For 5+ years of experience in product security, application security, software security, security engineering, backend engineering, or security platform engineering.
• Experience in building reliable backend services.
• Hands-on experience building security automation, developer tooling, libraries, infrastructure, or platform controls.
• Clear communication skills with the ability to explain technical security risk and business impact to engineers, product managers, and leadership.
• Preferred Qualifications Experience securing AI/LLM products, AI-assisted development tooling, agent frameworks, MCP-style tool ecosystems, retrieval-augmented generation systems, or model-integrated workflows.
• Experience building guardrails, policy engines, secure frameworks, scanners, linters, CI/CD checks, registries, gateways, or other developer-facing security platforms.
• Experience scanning or governing AI agent components such as skills, prompts, MCP servers, tool manifests, generated code, dependencies, or model-connected workflows.

Benefits and Perks

• In addition to base salary, this job is eligible to receive equity in the form of restricted stock units, and depending on the position offered, it may also be eligible to receive a commission.
• Additionally, Reddit offers a wide range of benefits to U.S.-based employees, including medical, dental, and vision insurance, 401(k) program with employer match, generous time off for vacation, and parental leave.

Work Location and Schedule

This role is listed as Remote USA with location information shown as Remote USA. The employment type is Full Time.

About the Company

Reddit is the organization connected with this listing. USA Jobs Today displays this opportunity for job discovery only, so applicants should verify company details, application instructions, and eligibility on the official employer website.