Staff Product Security Engineer

Affirm; New York (NY); Remote; USD 230,000 - 290,000; Full time

Benefits offered by this job

Health coverage for employees and deps

Monthly tech and wellness stipends

Flexible time off

Employee stock purchase plan

Job summary

Affirm is pursuing a Senior Security Engineer to lead the end-to-end security review process for AI/LLM systems. You will evaluate architecture, data flows, and permissions, designing guardrails and tests to ensure secure, scalable AI adoption across the company.

Partner with Security, Legal, Privacy, Compliance, IT, and Engineering to shape repeatable, auditable controls. You will build threat models for AI/LLM platforms, review code and configurations, and develop policy-as-code, while staying

Qualifications

• Seasoned security engineer for AI/LLM systems
• Threat modeling for AI/LLM apps and agentic systems
• Experience with enterprise security controls and IAM
• Governance artifacts for AI and vendor risk assessments
• Experience with IAM for non-human identities

Responsibilities

• Lead and continuously improve enterprise AI security review process for architectural risks
• Threat model AI/LLM systems and data flows; drive remediation
• Review source code, prompts, configurations, and tool manifests; help build security test cases
• Design and build security guardrails and tooling for AI systems and MCP servers
• Evaluate AI capabilities of third-party SaaS vendors during reviews
• Identify new AI security vulnerabilities and contribute to incident response playbooks
• Lead cross-functional AI security initiatives and communicate with executives

Skills

AI security

Threat modeling

Security architecture

Python

Terraform

Kubernetes

AWS

OAuth2

SAML

Non-human identities

Tools

Notion AI

Slack AI

Google Workspace AI

GitHub

Jira

OpenAI

Anthropic

Job description

At Affim, we exist for the moments that matter—giving people a clear, predictable way to pay over time, with no hidden fees, no surprises, and no tradeoffs on what matters most.

The InfoSec team protects affirm’s systems and data from evolving threats. We manage security risk, monitor vulnerabilities, and enforce protective controls across the company. The team leads incident response, compliance, identity and access management, and employee training. Our goal is to ensure that security is built into every system and decision at affirm. We maintain a secure, trustworthy environment so the business can operate and grow with confidence.

In this role, you’ll build and run affirm’s end-to-end security review process for enterprise AI/LLM systems evaluating architecture, prioritizing AI-specific risks, and designing the controls and guardrails that let affirm adopt AI safely, partnering across Security, Legal, Privacy, Compliance, IT, and Engineering to make it scalable and repeatable.

What You’ll Do

• You will lead and continuously improve Affirms enterprise AI security review process evaluating the architecture, data flows, permissions, and design of internal AI tools, agentic/MCP-based systems, and AI features — and embed security requirements into the design phase.
• You will threat model AI/LLM-based systems and their data flows for risks such as prompt injection, insecure output handling, excessive agency, tool-permission abuse, data poisoning, and sensitive-data exposure, and drive remediation.
• You will review source code, system prompts, agent configurations, and tool/permission manifests (e.g., MCP definitions), and help tool owners build security-focused test cases and red-team/eval scenarios to verify requirements before launch.
• You will design and build security guardrails and tooling for AI systems permission boundaries, authn/authz for agentic tools and MCP servers, data-handling controls, logging/monitoring, and policy-as-code (Python, IaC) — to enforce and automate AI security.
• You will evaluate the AI capabilities of third-party SaaS vendors (e.g., Notion, Slack, Google Workspace) as part of vendor and SaaS security reviews and drive risk-based adoption decisions.
• You will identify emerging classes of AI/agentic security vulnerabilities, develop mitigations before they become incidents, and contribute to AI-specific incident response playbooks as a senior escalation point.
• You will lead cross-functional AI security initiatives to closure, advise technical and executive stakeholders as an internal point of expertise, and stay current on the AI security landscape (OWASP LLM Top 10, MITRE ATLAS) to translate new research into practical controls.

What We Look For

• You are a seasoned security engineer with hands-on experience designing, evaluating, and maintaining security architecture for AI/LLM-based systems, plus deep expertise in enterprise security systems, processes, and controls.
• You have practical experience threat modeling and reviewing AI/LLM applications (e.g., against the OWASP Top 10 for LLM Applications) and securing agentic systems and tool-calling frameworks — MCP servers/clients, tool-permission models, and agent-to-tool trust boundaries.
• You have built AI governance artifacts (acceptable use policy, data-handling standards, vendor/model risk assessments) and evaluated AI capabilities within SaaS platforms (e.g., Notion AI, Slack AI, Google Workspace AI, GitHub Copilot) as part of vendor reviews.
• You have experience with enterprise tools for AI visibility and control (e.g., CASB, IDP/Okta) and familiarity with the corporate systems where AI is adopted (OpenAI, Anthropic, GitHub, Google Workspace, Slack, Notion, Jira).
• You can build security tooling, guardrails, and detections with Python or similar, and deploy cloud services and policy-as-code using Infrastructure as Code (Terraform or similar); familiarity with Kubernetes and AWS.
• You understand how LLMs and agentic systems are built (RAG, embeddings, fine-tuning, tool use) and authn/authz models (OAuth2, SAML, service-account/non-human identities) for agentic and machine-to-machine access, with strong application-architecture and threat-modeling fundamentals.
• You can lead cross-functional initiatives across Security, Engineering, Legal, Privacy, and Compliance and drive them to closure, and communicate effectively with technical and executive audiences. Experience in regulated environments (SOC 2, PCI DSS) and applying IAM to non-human/agent identities is a plus.

Base Pay Grade - P

Equity Grade - 13

Employees new to Affim typically come in at the start of the pay range.

Affirm focuses on providing a simple and transparent pay structure which is based on a variety of factors, including location, experience and job-related skills.

Base pay is part of a total compensation package that may include equity rewards, monthly stipends for health, wellness and tech spending, and benefits (including 100% subsidized medical coverage, dental and vision for you and your dependents.)

USA base pay range (CA, WA, NY, NJ, CT) per year: $230,000 - $290,000

USA base pay range (all other U.S. states) per year: $204,000 - $264,000

Remote-first with flexibility built in

Affirm is proud to be a remote-first company. Most roles can be done from almost anywhere within the country of employment. Some positions may occasionally require in-person work at an affirm office, and a few are office-based due to the nature of the work. All new hires will be invited to attend an in-person onboarding experience.

Benefits Designed For You

Our benefits reflect our commitment to care, transparency, and flexibility. Here are a few highlights:

• Health coverage at no cost: We cover 100% of premiums for employees and their dependents.
• Spending stipends: Monthly stipends support your tech setup, and the ability to choose health and wellness options that are right for you.
• Time off to recharge: Flexible time off and generous holiday calendars help you rest when you need to.
• Own a piece of what you build: Our employee stock purchase plan (ESPP) lets you buy affirm stock at a discount.

We’re committed to providing an inclusive interview process, including accommodations for candidates with disabilities. If you need support, we’re happy to help.

For positions based in San Francisco or Los Angeles: affirm considers qualified applicants with arrest and conviction records, as required by law.