Senior Software Engineer, Backend (Identity International)

About the Position

Senior Software Engineer, Backend (Identity International)

Remote Poland

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.

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.

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.

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.

Responsibilities

• Own and deliver quarterly goals for your team, leading engineers through ambiguity to solve open-ended problems, and ensuring that everyone is supported throughout delivery.
• Support peers and stakeholders in the product development lifecycle by collaborating 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 “keep the lights on” & on-call efforts.
• 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.
• Help develop talent on your team by providing feedback and guidance, and leading by example.

Requirements

• 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. Write high-quality code that is easily understood and used by others.
• Proficient at making significant changes in a large code base, and have developed a suite of tools and practices that enable you and your team to do so safely.
• Demonstrates ownership of your growth, proactively seeking feedback from your team, your manager, and your stakeholders.
• Strong verbal and written communication skills that support effective collaboration with our global engineering team.

We Offer

• Base Pay: 308,000 zł - 428,000 zł
• Equity: Awarded in US Dollars
  • Equity grade: 4
  • New hire equity: $32,000-$48,000
  • Annual Refresh: $10,000
  • Reward equity: $0-$150,000
• Flexible Spending Wallets: Up to 1390 zł per month for technology and wellbeing related needs.
• Comprehensive Benefits:
  • Competitive paid time off, paid public holidays, and additional paid Away Days.
  • Comprehensive private healthcare through Lux Med's Platinum package.
  • A MultiSport card to support your health and well-being.
  • Learning and development programs.
  • Family healthcare support through Maven and parental leave support through Parentaly.
  • Mental well-being support through Lyra, including up to 12 confidential counseling or coaching sessions each year for you and your household members.
  • Financial well-being support through Northstar, with unlimited access to Certified Financial Advisors and planning tools at no cost to you.
  • Employee Resource Groups (ERGs) that foster connection and inclusion.
  • Eligibility for creative tax benefits, subject to applicable law, role, and company policy.

About the Company

Affirm is proud to be a remote-first company! The majority of our roles are remote and you can work almost anywhere within the country of employment. Affirmers in proximal roles have the flexibility to work remotely, but will occasionally be required to work out of their assigned Affirm office. A limited number of roles remain office-based due to the nature of their job responsibilities.

We’re extremely proud to offer competitive benefits that are anchored to our core value of people come first. Some key highlights of our benefits package include:

• Health care coverage - Affirm covers all premiums for all levels of coverage for you and your dependents.
• Flexible Spending Wallets - generous stipends for spending on Technology, Food, various Lifestyle needs, and family forming expenses.
• Time off - competitive vacation and holiday schedules allowing you to take time off to rest and recharge.
• ESPP - An employee stock purchase plan enabling you to buy shares of Affirm at a discount.

We believe It’s On Us to provide an inclusive interview experience for all, including people with disabilities. We are happy to provide reasonable accommodations to candidates in need of individualized support during the hiring process.

[For U.S. positions that could be performed in Los Angeles or San Francisco] Pursuant to the San Francisco Fair Chance Ordinance and Los Angeles Fair Chance Initiative for Hiring Ordinance, Affirm will consider for employment qualified applicants with arrest and conviction records.

By clicking "Submit Application," you acknowledge that you have read Affirm's Global Candidate Privacy Notice and hereby freely and unambiguously give informed consent to the collection, processing, use, and storage of your personal information as described therein.

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