Who you are
- We're looking for a Senior Software Engineer to join our fully remote team based in Europe
- 5+ years of experience building backend systems at scale using Python or Kotlin
- Experience with distributed systems and infrastructure using AWS, MySQL/PostgreSQL, and Kubernetes
- Strong system design skills and a track record of delivering maintainable, extensible services
- Fluency with AI-driven engineering - every Affirm engineer builds with tools like Claude Code and most PRs are co-authored with AI, so directing and orchestrating AI and excelling in the reviewer's seat (setting intent, critically evaluating generated code, and owning its correctness, quality, and security) is a core expectation
- Proficiency in SQL and working with data-rich environments
- Familiarity with CI/CD practices and safe production deployments
- Strong written and verbal communication skills, especially in distributed teams
- A proactive, ownership-driven mindset with a focus on learning and team success
- Experience with Snowflake, dbt, Airflow, or Chronosphere (nice to have)




- Background in fraud prevention, risk systems, or real-time decisioning (nice to have)
- Experience building for multiple markets or regions - internationalization or localization (nice to have)
- Experience working in the fintech sector or other highly regulated environments, with a strong understanding of risk, compliance, and operational constraints. (nice to have)
What the job involves
- 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 Fraud Engineering organization builds the foundational and tactical software that enables Affirm to respond strategically to fraud - both in real time and after the transaction
- Our mission is to support business growth while protecting Affirm, our buyers, and our merchants. We evaluate risk at critical decision points in the user journey,

📌 Senior Backend Software Engineer (España)
🏢 Affirm
📍 España