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. The Merchant Data Platform is a backend, foundational service at Affirm responsible for merchant data and identity across all merchant touchpoints. The platform serves millions of requests per day, supports merchant onboarding, and maintains strict availability and latency SLAs. The team maintains sophisticated pipelines for merchant identification, risk analysis, and fraud detection.

• 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.
• Experience 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 code, and providing feedback through code reviews.
• Experience defining technical plans for significant features or system components with elegant, simple, and extensible designs.
• Ability to make significant changes in large code bases safely using developed tools and practices.
• Proactive ownership of personal growth and seeking feedback.
• Strong verbal and written communication skills for effective collaboration with a global engineering team.

• Own and deliver quarterly goals for the 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.
• Identify project, process, technology, or business issues and lead in solving them.
• Drive detailed project definition, design, cross-functional alignment, estimation, task breakdown, delivery, monitoring, and maintenance.
• Support operations and availability 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 designs, code quality, and testing.
• Own the availability, reliability, and performance of the team’s systems.

This role is remote within Poland. The job description is not a contractual document and is not intended to have binding force. Affirm provides reasonable accommodations to candidates with disabilities during the hiring process. Affirm considers qualified applicants with arrest and conviction records for employment in compliance with relevant ordinances.