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Senior Software Engineer, Backend (Partner Merchant Interface)

Affirm· Checkout
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Remote$195k - $255kFull-timePosted 1mo ago

About the role

Senior Software Engineer for the Partner Merchant Interfaces - Integration team, focusing on backend APIs used by Partners and Merchants to integrate with Affirm (powering partners like Amazon and Stripe). Remote-first role with US flexibility.

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.

Qualifications

  • You have previous work or internship experience designing, developing and launching backend systems at scale and are experienced using one of Python or Kotlin.
  • You are familiar with the building blocks of distributed systems, and the technologies like AWS, MySQL and Kubernetes.
  • You have mastered 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.
  • You are comfortable navigating a large code base, debugging others' code, and providing feedback to other engineers through code reviews.
  • Your experience demonstrates that you take ownership of your growth, proactively seeking feedback from your team, your manager, and your stakeholders.
  • You have strong verbal and written communication skills that support effective collaboration with our global engineering team.
  • This position requires either equivalent practical experience or a Bachelor’s degree in a related field.

Skills

Required:Backend design and developmentPythonDistributed systemsCode reviewsCommunication
Nice to have:Kotlin

Benefits

  • Health coverage at no cost: We cover 100% of premiums for employees and their dependents.
  • Spending stipends: Monthly stipends support your tech setup, and the ability to choose health and wellness options that are right for you.
  • Time off to recharge: Flexible time off and generous holiday calendars help you rest when you need to.
  • Own a piece of what you build: Our employee stock purchase plan (ESPP) lets you buy Affirm stock at a discount.
Last updated Sep 16, 2026. Interested? Apply on the company site.

About Affirm

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