Senior Software Engineer, Backend (Identity International) Remote Spain 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. Affirm's Identity team is mission-critical to the customer checkout experience. When a customer chooses Affirm, one of the first steps is an identity check, and our ability to make the right decision directly impacts conversion, revenue, fraud exposure, and regulatory compliance.

We are responsible for KYC, user lifecycle management, and identity decisioning across multiple regulatory environments. We are looking for a Senior Software Engineer who can turn ambiguous business and customer problems into reliable, well-designed technical solutions. In this role, you will help shape our quarterly technical direction, translate team goals into concrete projects, and identify cross-cutting risks, tradeoffs, and opportunities.

We're looking for someone who takes ownership beyond shipping code: raising code quality and review standards, making performance, availability, and scale tradeoffs explicit, and improving the operational health of the systems they own. You'll help reduce toil, create useful playbooks, mentor engineers, support new hires and interns, and contribute to high-signal hiring. This is a deeply technical, hands-on coding role where feature velocity and operational excellence go hand-in-hand.

You'll spend most of your week in the codebase - leveraging AI tools to write robust Kotlin and Python, ship impactful features, investigate complex production issues, and keep our systems rock-solid and reliable. This is a high-visibility, high-impact role for someone who wants to work on foundational systems that directly enable Affirm's global growth. You will be responsible for owning and delivering quarterly goals for your team,



leading engineers on your team through ambiguity to solve open-ended problems, and ensuring that everyone is supported throughout delivery.

You will proactively identify project, process, technology or business issues, advocate for them, and lead in solving them. You will support the operations and availability of your team's artifacts by creating and monitoring metrics, escalating when needed, and supporting "keep the lights on" & on-call efforts. You will foster a culture of quality and ownership on your team by setting or improving code review and design standards for your team, and advocating for them beyond your team through your writing and tech talks.

You have 4+ years of experience designing, developing and launching backend systems at scale using languages like Python or Kotlin. You have a track record of developing highly available distributed systems using technologies like AWS, MySQL and Kubernetes. You write high quality code that is easily understood and used by others.

You have strong verbal and written communication skills that support effective collaboration with our general engineering team. Base pay is part of a total compensation package that may include monthly stipends for health, wellness and tech spending, and benefits (including 100% subsidized medical coverage, dental and vision for you and your dependents). Location - Remote Spain We are able to offer visa sponsorship for this role, but do require that someone is based in Spain for the role.

Remote-first with flexibility built in Affirm is proud to be a remote-first company. 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.

Health coverage at no cost: Flexible time off and generous holiday calendars help you rest when you need to. Affirm considers qualified applicants with arrest and conviction records, as required by law.

📌 Senior Back-End Software Engineer (Remote) (Madrid)
🏢 Affirm
📍 Madrid