KeyStep

Staff Product Security Engineer

Affirm
Remote US
28 days ago
full-timeremote

Skills & Technologies

ProgrammaticImplementationMakeInformation Security

Job Description

Affirm is reinventing credit to make it more honest and friendly, giving consumers the flexibility to buy now and pay later without any hidden fees or compounding interest.

Affirm is reinventing credit to make it more honest and friendly, giving consumers the flexibility to buy now and pay later without any hidden fees or compounding interest.

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 Staff 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.

What You'll Do

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.

What We Look For

Deep understanding of web application architecture an

Company & Role Analysis

JobSeeker+
Likely perks
Private MedicalPension25+ Days HolidayStock OptionsLearning BudgetFlexible Hours
Culture & working style

Neutral 2–4 sentence summary of what working at this company is like, drawn from public reviews and press coverage. Tone, collaboration style, pace, benefits highlights.

Market salary range

£45,000 – £60,000 (Glassdoor, Levels.fyi, 2025)

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