Senior Software Engineer, Backend (Partner Merchant Interface)

About the Position

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.

The Partner Merchant Interfaces - Integration team within Decisions Foundations is growing and we are looking for a Senior Software Engineer, Backend. You will be part of a fast-paced team which is responsible for the APIs that Partners and Merchants use to integrate with Affirm, and also power some of our top partners like Amazon and Stripe.

Responsibilities

• With the support of your team, you will work on tasks that contribute to the team's projects and goals.
• You will work collaboratively and proactively with your team and stakeholders, bringing them along for your work and helping to create visibility and dialog regarding the risks and trade-offs related to your work.
• You will strike the right balance of speed and quality in your work, ensuring that we hit our business goals while protecting our systems from downtime.
• You will contribute to a sense of community on your team by engaging in growth and development activities.

Requirements

• Previous work or internship experience designing, developing, and launching backend systems at scale using Python or Kotlin.
• Familiarity with the building blocks of distributed systems, and technologies like AWS, MySQL, and Kubernetes.
• Mastery of taking a simple problem or business scenario into a solution that interacts with multiple software components, and executing on it by writing clear, easily understood, well-tested, and extensible code.
• Comfort navigating a large code base, debugging others' code, and providing feedback to other engineers through code reviews.
• Experience demonstrating that you take ownership of your growth, proactively seeking feedback from your team, your manager, and your stakeholders.
• Strong verbal and written communication skills that support effective collaboration with our global engineering team.

We Offer

• Base Pay Grade: N
• Equity Grade: 6
• Base Pay Range: $153,000 - $213,000 per year (CAD)
• Benefits:
  • Health coverage at no cost: 100% subsidized medical coverage, dental, and vision for you and your dependents.
  • Monthly stipends for health, wellness, and tech spending.
  • Flexible time off and generous holiday calendars.
  • Employee stock purchase plan (ESPP) to buy Affirm stock at a discount.

About the Company

At Affirm, we are 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.

Our benefits reflect our commitment to care, transparency, and flexibility. 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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