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Affirm is reinventing credit to make it more honest and friendly. This is a hands-on engineering position within Information Security, focused on designing and shipping core Customer Identity and Access Management (CIAM) capabilities that protect customers and support growth.
You will build and operate backend services powering registration, login, authorization, and account lifecycle flows across B2C and B2B experiences. Working closely with partner engineering teams, you'll ensure identity features are delivered with strong security fundamentals, reliability, and operational rigor.
Key responsibilities include:
- 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 identity standards such as OAuth 2.0, OIDC, SAML, and SCIM in code, ensuring correctness, scalability, and clean integration patterns
- Develop backend APIs and services in Python and Kotlin that expose identity capabilities to web, mobile, and partner applications
- Integrate CIAM platforms with internal systems including user data stores, messaging, fraud signals, and downstream customer platforms
- Own secure authentication and account flows end-to-end, including MFA, step-up authentication, device binding, consent, and adaptive authentication logic
- Automate CIAM infrastructure and deployments using Infrastructure as Code and CI/CD pipelines
- Monitor, debug, and optimize CIAM services for performance, resilience, and abuse detection in high-scale environments
Required qualifications:
- 7+ years designing, developing, and launching backend systems at scale using Python or Kotlin
- Extensive track record developing highly available distributed systems using AWS, MySQL, Spark, and Kubernetes
- Strong verbal and written communication skills supporting effective collaboration with global engineering teams
- Experience delivering major features, system components, or deprecating functionality through technical and execution planning
- Deep, hands-on knowledge of OAuth 2.0, OIDC, SAML, and SCIM beyond basic configuration
- Strong production experience in Python or similar backend language
- Experience designing APIs, automation frameworks, and distributed systems
- Hands-on experience building and maintaining CI/CD pipelines
- Experience with cloud-native development, preferably AWS
- Hands-on experience extending and integrating CIAM platforms such as Okta, Auth0, Ping Identity, ForgeRock, or Azure AD B2C
- Solid understanding of backend and distributed systems fundamentals
- Experience with Infrastructure as Code tools such as Terraform
- Strong security fundamentals applied through engineering, including access control models, token handling, encryption, MFA, and privacy by design
- Familiarity with AI-augmented development environments like Cursor
