Senior Software Engineer, Backend (Merchant Data Platform EU)

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.

Identity International is a newly established team created to accelerate Affirm’s international expansion - one of the company’s top priorities. Our vision is to become a trusted, self-sufficient team that drives customer identity capabilities end-to-end across international markets.

The team’s scope includes building and expanding Identity Data Management, Verification, and Decisioning capabilities for Europe, evaluating and integrating third-party KYC vendors, and ensuring alignment with global platform and operational standards. We operate at the intersection of technical depth, regulatory complexity, and cross-geo collaboration, making this an exciting opportunity for engineers who want to shape one of Affirm’s foundational processes.

By joining the team, you will directly influence how Affirm operates Identity in international markets - a challenge that is critical for both business growth and customer trust.

• 4+ years of experience as a software engineer with leadership responsibilities and mentoring junior engineers
• Experience designing, developing, and launching backend systems at scale
• Proficient in Python or Kotlin
• Track record of developing highly available distributed systems using AWS, MySQL, and Kubernetes
• Ability to synthesize complex business products and technical requirements to produce high quality system designs and software
• Comfortable navigating large code bases, debugging others' code, and providing feedback through code reviews
• Experience defining technical plans for significant features or system components with elegant, simple, and extensible designs
• Write high quality, easily understood, and reusable code
• Proficient at making significant changes in large code bases with tools and practices for safe development
• Take ownership of personal growth and proactively seek feedback

• 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, and analytics
• Participate in ideation, articulate technical constraints, and partner on decisions considering risks and trade-offs
• Proactively identify and lead in solving project, process, technology, or business issues
• Drive detailed project definition, design, cross-functional alignment, estimation, task breakdown, delivery, monitoring, and maintenance
• Support operations and availability of team artifacts by creating and monitoring metrics, escalating when needed, and supporting on-call efforts
• Engage in growth and development activities such as participation in the interview process
• Mentor engineers to improve their designs, code quality, and testing