Staff Product Security Engineer
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Job Description
Staff Product Security Engineer building CIAM backend services for Affirm’s buy-now-pay-later platform. Securing authentication, authorization, and account lifecycle flows at scale.
Responsibilities:
- Design, build, and operate CIAM backend services for customer registration, authentication, authorization, account lifecycle, and profile management
- Implement OAuth 2.0, OIDC, SAML, and SCIM identity standards
- Develop Python and Kotlin backend APIs and services for web, mobile, and partner applications
- Integrate CIAM platforms with user data stores, messaging, fraud signals, and downstream customer platforms
- Own secure authentication and account flows, including MFA, step-up authentication, device binding, consent, and adaptive authentication
- Automate CIAM infrastructure and deployments with Infrastructure as Code and CI/CD pipelines
- Monitor, debug, and optimize CIAM services for performance, resilience, and abuse detection
- Collaborate with product, frontend, mobile, security, and partner engineering teams
Requirements:
- 7+ years designing, developing, and launching backend systems at scale using Python or Kotlin
- 5+ years of professional backend software engineering experience
- Strong CIAM systems implementation experience
- Deep hands-on knowledge of OAuth 2.0, OIDC, SAML, and SCIM
- Production experience in Python or a similar backend language
- Experience designing APIs, automation frameworks, and distributed systems
- Hands-on experience building and maintaining CI/CD pipelines
- Experience with GitHub workflows and Buildkite or similar build systems
- Cloud-native development experience, preferably AWS
- Experience extending and integrating CIAM platforms such as Okta, Auth0, Ping Identity, ForgeRock, or Azure AD B2C using custom code, hooks, and APIs
- Understanding of API design, data modeling, latency, error handling, and observability
- Infrastructure as Code and automation experience, such as Terraform
- Security engineering fundamentals including access control, token handling, encryption, MFA, and privacy by design
- Ability to collaborate with product, frontend, mobile, and security teams
- Familiarity with Cursor and AI-augmented development environments
Benefits:
- 100% subsidized medical coverage for employees and dependents
- Dental and vision coverage for employees and dependents
- Monthly stipends for health, wellness, and tech spending
- Flexible Spending Wallets with stipends for Technology, Food, Lifestyle needs, and family forming expenses
- Competitive vacation and holiday schedules
- Employee stock purchase plan (ESPP) enabling discounted Affirm shares
- Reasonable accommodations during the hiring process
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