About the role

Role overview

As a Frontend Software Engineer (Purchasing Integrations) at Affirm, you’ll build and maintain the JavaScript SDK and frontend infrastructure used at checkout. You’ll help ensure the SDK integrates smoothly with diverse merchant stacks while protecting user experience and performance.

Key responsibilities

Contribute to the design and development of Affirm’s JavaScript SDK and checkout frontend infrastructure.
Improve bundle optimization and script loading strategies.
Drive rendering performance improvements and optimize for Web Vitals.
Collaborate with Product, Design, and Analytics to support the product development cycle, including ideation and technical constraint tradeoffs.
Ensure SDK performance and UX remain strong across varied merchant implementations.

Requirements

1.5+ years of software engineering experience.
Ownership mindset: proactively seek feedback from your team, manager, and stakeholders.
Ability to turn business problems into solutions spanning multiple software components.
Strong communication skills (verbal and written) for collaboration with a global team.
Comfortable working in a large codebase, debugging others’ code, and contributing via code reviews.
Experience with JavaScript/TypeScript.
Experience shipping web apps using declarative UI frameworks such as React or Vue.
Experience designing, developing, and launching APIs at scale (e.g., using Python or Kotlin).
Bachelor’s degree in a related field or equivalent practical experience.

Nice to haves

Not explicitly stated.

About Affirm

Affirm is a fintech company focused on reinventing credit to make it more honest and friendly. The team builds customer-facing credit experiences and the engineering infrastructure that supports integrations across merchants at checkout.