Senior Software Engineer, Backend (Identity International)

Affirm is reinventing credit to make it more honest and friendly, giving consumers the flexibility to buy now and pay later without any hidden fees or compounding interest. The Identity team is mission-critical to the customer checkout experience, owning identity for all markets outside North America. The team is responsible for KYC, user lifecycle management, and identity decisioning across multiple regulatory environments, playing a key role in Affirm's international expansion.

We are looking for a Senior Software Engineer who can turn ambiguous business and customer problems into reliable, well-designed technical solutions. You will help shape quarterly technical direction, translate team goals into concrete projects, and identify cross-cutting risks, tradeoffs, and opportunities. You should be comfortable designing across system boundaries, driving collaboration with partner teams, and advocating for technical investments that improve long-term execution. You will take 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 you 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.

• Own and deliver quarterly goals for your team, leading engineers through ambiguity to solve open-ended problems.
• Collaborate with product management, design & analytics by participating in ideation, articulating technical constraints, and partnering on decisions that properly consider risks and trade-offs.
• Proactively identify project, process, technology or business issues, advocate for them, and lead in solving them.
• Support the operations and availability of your team's artifacts by creating and monitoring metrics, escalating when needed, and supporting on-call efforts.
• Foster a culture of quality and ownership by setting or improving code review and design standards, and advocating for them beyond your team through writing and tech talks.
• Help develop talent on your team by providing feedback and guidance, and leading by example.
• Participate in an on-call rotation as a requirement.

• 4+ years of experience designing, developing and launching backend systems at scale using languages like Python or Kotlin.
• Track record of developing highly available distributed systems using technologies like AWS, MySQL and Kubernetes.
• Experience defining a technical plan for the delivery of a significant feature or system component with an elegant, simple and extensible design.
• Proficiency at making significant changes in a large code base, with a suite of tools and practices that enable safe changes.
• Ownership of your growth, proactively seeking feedback from your team, manager, and stakeholders.
• Strong verbal and written communication skills for effective collaboration with a global engineering team.

Pay Grade - N, Equity Grade - 4. Base pay range per year: €86,000 - €122,000. Total compensation 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. Employees may be eligible for equity rewards offered by Affirm Holdings, Inc. Additional benefits include Flexible Spending Wallets for tech, food and lifestyle, Away Days (wellness days off), Learning & Development programs, Parental benefits, and Employee Resource & Community Groups.

Remote Spain. Visa sponsorship is available, but you must be based in Spain for the role.

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