Senior Software Engineer, Backend (Partner Merchant Interface)

🌐 Remote💼 Full-time💰 $153,000–$153,000🗓 2026-09-09 → 2026-09-25

Core

Designing, developing, and launching backend systems at scale for APIs that enable partners and merchants to integrate with Affirm.

Role type

Senior IC backend software engineer

Builds

Integration APIs for partners and merchants

Domain

Fintech / Distributed systems

Deliverable

production ML models | product features

Required skills

Python or Kotlin, distributed systems, AWS, MySQL, Kubernetes, system design, code review, debugging

Responsibilities

Develop and launch backend systems at scale, collaborate with stakeholders on risks and trade-offs, balance speed and quality to protect system uptime, navigate large codebases and debug others' code

Seniority

Senior, hands-on IC

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About Affirm

Financial Services3128San Francisco, California, USFounded 2012

At Affirm, we’re using today’s technology to bring significant disruptive innovation to the financial industry. We focus on improving the lives of consumers by delivering simple, honest and transparent financial products. We have roles across a variety of teams, including engineering, product, finance, operations, revenue, marketing, people and more. A note to applicants: Fake job and recruiting scams are on the rise. Affirm will never ask you to pay any upfront fees or send you any checks to purchase equipment during any part of the recruiting process. Affirm only uses legitimate company emai