Senior CIAM Software Engineer

<div class="content-intro"><p>At Affirm, 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.</p></div><p>Affirm is building the next generation of customer identity and authentication. This role is a hands-on engineering position inside Information Security, focused on designing and shipping core CIAM capabilities that protect customers and support growth.</p> <p>You will build and operate backend services that power registration, login, authorization, and account lifecycle flows across B2C and B2B experiences. You will work closely with partner engineering teams and ensure identity features are delivered with strong security fundamentals, reliability, and operational rigor.</p> <h3>What you’ll do</h3> <ul> <li>Design, build, and operate core CIAM backend services that support customer registration, authentication, authorization, account lifecycle, and profile management for B2C and B2B platforms.</li> <li>Implement and extend identity standards such as OAuth 2.0, OIDC, SAML, and SCIM in code, ensuring correctness, scalability, and clean integration patterns.</li> <li>Develop backend APIs and services in Python and Kotlin that expose identity capabilities to web, mobile, and partner applications.</li> <li>Integrate CIAM platforms with internal systems, including user data stores, messaging, fraud signals, and downstream customer platforms.</li> <li>Own secure au