Software Engineer II - CIAM

Affirm is building the next generation of customer identity and authentication. This role is a hands-on, mid-engineering position inside Information Security, contributing to core CIAM capabilities that protect customers and support growth. You will help build and maintain backend services that power registration, login, authorization, and account lifecycle flows across B2C and B2B experiences, working with experienced engineers and partner teams to deliver scoped identity features with strong security fundamentals, reliability, and operational rigor.

Responsibilities

Build and ship customer-facing authentication features, from smoother login experiences to MFA, step-up authentication, and device binding; Develop backend services and APIs in Python or Kotlin, turning product requirements into working software; Work with identity technologies such as Okta, Auth0, and ForgeRock, writing custom code and integrations for web, mobile, and partner applications; Take scoped features through the software development lifecycle, including design, code, automated tests, code reviews, and production deployment; Solve engineering problems by debugging services, improving reliability, and using logs and metrics to understand production behavior; Collaborate with engineering and product partners and learn secure development practices

Requirements

Demonstrated ability to write, test, and debug software in Python, Kotlin, or a similar language through coursework, internships, personal projects, open source, or professional work; Foundational understanding of backend development, including APIs, data structures, databases, and version control; Genuine curiosity about how authentication works and motivation to build secure, reliable customer experiences; A practical problem-solving approach, willingness to ask questions, and openness to learning through mentorship and code review; Clear communication and the ability to collaborate with engineering, product, and security teammates; Equivalent practical experience or a Bachelor's degree in a related field

Nice to have

Prior experience with identity protocols or CIAM platforms

Benefits

100% subsidized medical, dental, and vision coverage for employees and dependents; Monthly stipends for health, wellness, and tech spending; Equity rewards; Flexible time off and generous holiday calendar; Employee stock purchase plan (ESPP)