Affirm
Senior Software Engineer, Backend (Identity International)
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At Affirm
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
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. Our team owns Identity for all markets outside North America, playing a key role in Affirm’s international expansion. We are responsible for KYC, user lifecycle management, and identity decisioning across multiple regulatory environments. This work is about shaping how Affirm adapts its core Identity platform to new market dynamics, customer expectations, and compliance requirements.
We are a team of six engineers based across Spain and Poland. We are looking for a Senior Software Engineer who can turn ambiguous business and customer problems into reliable, well-designed technical solutions.
Role Responsibilities
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. You should be comfortable designing across system boundaries, driving collaboration with partner teams, and advocating for technical investments that improve long-term execution. 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.
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Most importantly, we’re excited to work with someone who leaves things better than they found them, communicates clearly across audiences, uses customer feedback to influence technical plans, and helps the team continuously improve.
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.
What You'll Do
- Own and deliver quarterly goals for your team
- Lead engineers through ambiguity to solve open-ended problems
- Support peers and stakeholders in the product development lifecycle by collaborating with product management, design & analytics
- Proactively identify project, process, technology, or business issues and lead in solving them
- Support the operations and availability of your team’s artifacts by creating and monitoring metrics
- Foster a culture of quality and ownership on your team by setting or improving code review and design standards
- Help develop talent on your team by providing feedback and guidance
What We Look For
- 4+ years of experience designing, developing, and launching backend systems at scale using languages like Python or Kotlin
- Experience with 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 and developing a suite of tools and practices that enable safe changes
- Strong verbal and written communication skills
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Compensation
- Pay Grade: N
- Equity Grade: 5
Base pay range per year: £120,000–£168,000 GBP
Location: Remote UK
Remote-first with flexibility built in
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
- Own a piece of what you build: Our employee stock purchase plan (ESPP) lets you buy Affirm stock at a discount
Commitment to Inclusion
Affirm is 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.
By clicking "Submit Application," you acknowledge that you have read Affirm's Global Candidate Privacy Notice and consent to the use of your personal information as described.
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