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Partner with product teams to embed security throughout the product development lifecycle, conduct threat modeling and architecture reviews, and review source code for vulnerabilities. Automate security processes and help define security‑focused test cases.
Deep knowledge of web application architecture, common security flaws (OWASP, SANS) and experience with threat modeling, authentication protocols like SAML/OAuth2, and cloud‑based development (Python, Kotlin, Java, AWS/Azure). Experience in PCI or other regulated environments and familiarity with CI/CD pipelines is also required.
Security is a core pillar of Affirm’s mission to deliver honest financial products, and this role ensures products are built with risk reduction and compliance from the start. Effective security engineering protects customers and supports the company’s growth.
Candidates who enjoy collaborating across product and engineering teams, thrive on solving complex security challenges, and have a track record of driving security practices in cloud‑native, regulated environments. Ideal for engineers who combine deep technical expertise with strong communication and project‑management skills.
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.
Affirm values information security as a critical part of the company’s continued success. Our mission is to make information security programmatic and cultural in Affirm, enabling the company to succeed in building honest financial products. The Security team posture increases security and reduces risk while securely enabling access to information for those who need it!
The Senior Product Security Engineer candidate will have experience building and architecting software as part of a larger team. The ideal candidate will work effectively with product and engineering teams to evaluate and influence product requirements, design, and implementation to improve the security of Affirm’s products.
Partner with Affirm product teams to ensure that security is included in every phase of the product development lifecycle.
Conduct threat modeling and architecture reviews to ensure threats are understood, documented, and mitigated.
Review and analyze product source code to identify security vulnerabilities and provide recommendations for secure implementation.
Seek out opportunities to automate processes when appropriate.
Identify emerging classes of vulnerabilities and developing solutions for them before they’re a problem.
Assist product teams in the development of security focused test cases to enforce security requirements.
Advise product teams on business security requirements early in the product development lifecycle.
Decompose large, cross-team projects into individual tasks. Manage scope across teams and drive toward project closure.
Deep understanding of web application architecture and design principles
Experience using modern software development and delivery techniques to develop cloud-based services. Python, Kotlin, Java, AWS, and Azure experience preferred.
Knowledge of common security flaws and resolution as published by OWASP, SANS, etc.
Experience with PCI or other regulated environments.
Experience conducting threat models for complex, distributed products using standard threat modeling techniques and methodologies.
Experience with standard authentication mechanisms, including SAML and OAuth2.
Understanding of continuous integration / continuous deployment processes and tools.
BS degree in related field or equivalent experience. MS degree in a related field or equivalent experience is a plus.
Base Pay Grade - N
Equity Grade - 9
Employees new to Affirm typically come in at the start of the pay range. Affirm focuses on providing a simple and transparent pay structure which is based on a variety of factors, including location, experience and job-related skills.
Base pay is part of a total compensation package that may include equity rewards, monthly stipends for health, wellness and tech spending, and benefits (including 100% subsidized medical coverage, dental and vision for you and your dependents.)
USA base pay range (CA, WA, NY, NJ, CT) per year: $195,000 - $255,000 USD.
USA base pay range (all other U.S. states) per year: $173,000 - $233,000 USD.
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Remote-first with flexibility built in
Affirm is proud to be a remote-first company. Most roles can be done from almost anywhere within the country of employment. Some positions may occasionally require in-person work at an Affirm office, and a few are office-based due to the nature of the work. All new hires will be invited to attend an in-person onboarding experience.
Benefits designed for you
Our benefits reflect our commitment to care, transparency, and flexibility. Here are a few highlights:
We’re committed to providing an inclusive interview process, including accommodations for candidates with disabilities. If you need support, we’re happy to help.
For positions based in San Francisco or Los Angeles: Affirm considers qualified applicants with arrest and conviction records, as required by law.
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