Senior Software Engineer, Back-end (Fraud)

About this job

What We Look For 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.…

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Most-requested skills in Poland

Based on 1,034 Poland vacancies that list requirements, these are the skills employers ask for most often.

• Java41% of postings
• SQL32% of postings
• Python27% of postings
• Spring24% of postings
• CI/CD19% of postings
• React19% of postings
• JavaScript18% of postings
• Git16% of postings

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