Staff Product Security Engineer
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Job Description
Staff Product Security Engineer building customer identity and authentication services for Affirm’s buy-now-pay-later platform. Designing secure, scalable CIAM backend systems and integrations.
Responsibilities:
- Design, build, and operate core CIAM backend services supporting customer registration, authentication, authorization, account lifecycle, and profile management for B2C and B2B platforms
- Implement and extend OAuth 2.0, OIDC, SAML, and SCIM identity standards
- Develop backend APIs and services in Python and Kotlin 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
- Deliver major features and system components through technical and execution plans
- Collaborate with partner engineering, product, frontend, mobile, and security teams
Requirements:
- 7+ years of experience designing, developing, and launching backend systems at scale using Python or Kotlin
- 5+ years of professional backend software engineering experience
- Strong experience designing and implementing CIAM systems
- Deep hands-on knowledge of OAuth 2.0, OIDC, SAML, and SCIM
- Strong 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-based development workflows and Buildkite or similar build systems
- Experience with cloud-native development, preferably AWS
- Experience extending and integrating CIAM platforms such as Okta, Auth0, Ping Identity, ForgeRock, or Azure AD B2C
- Understanding of API design, data modeling, latency, error handling, and observability
- Experience with Infrastructure as Code and automation tools such as Terraform
- Security fundamentals including access control, token handling, encryption, MFA, and privacy by design
- Strong verbal and written communication skills
- Familiarity with Cursor and other AI-augmented development environments
Benefits:
- Health care coverage - Affirm covers all premiums for all levels of coverage for you and your dependents
- Flexible Spending Wallets - generous stipends for spending on Technology, Food, various Lifestyle needs, and family forming expenses
- Time off - competitive vacation and holiday schedules allowing you to take time off to rest and recharge
- ESPP - An employee stock purchase plan enabling you to buy shares of Affirm at a discount
- Equity rewards may be included in the total compensation package
- Monthly stipends for health, wellness and tech spending
- Dental and vision coverage for you and your dependents
- Reasonable accommodations during the hiring process
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