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Senior Software Engineer, Back-end (Fraud)

1 month, 1 week ago
Poland
Full-time
Senior
Software Engineer
Software Development
Apache Airflow AWS CI/CD dbt Kotlin Kubernetes Machine Learning MySQL PostgreSQL Python Snowflake SQL
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Affirm

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Diversified Financial Services
1K-5K
Founded 2012
View All Jobs 91

Description

  • Own and deliver quarterly team goals while leading engineers through ambiguous, open-ended problems.
  • Design and implement real-time fraud decisioning services and APIs in Python or Kotlin.
  • Build platform and tooling to launch fraud decisioning in new countries with repeatable, low-friction setup.
  • Integrate region-specific fraud and risk vendors and operationalize machine learning and AI signals for decisioning.
  • Collaborate with Product, Machine Learning, Analytics, Fraud Strategy, Compliance, and Fraud Operations on technical and product decisions.
  • Support system operations through metrics, monitoring, escalation, and on-call/keep-the-lights-on work.
  • Set and improve code review and design standards, mentor teammates, and lead by example.
  • Help weigh technical risks and trade-offs across the product development lifecycle.

Requirements

  • 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.
  • Proficiency in SQL and working in 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.
  • Fluency with AI-driven engineering tools and the ability to direct, evaluate, and own AI-generated code.
  • 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, including internationalization or localization (nice to have).
  • Experience in fintech or other highly regulated environments with an understanding of risk, compliance, and operational constraints (nice to have).

Benefits

  • Base pay range of 308,000 zł - 428,000 zł per year.
  • Equity grade 4 with possible equity rewards.
  • 100% subsidized medical, dental, and vision coverage for employees and dependents.
  • Monthly stipends and Flexible Spending Wallets for tech, food, lifestyle, and family-forming expenses.
  • Away Days / wellness days to rest and recharge.
  • Learning and Development programs.
  • Parental benefits.
  • Employee stock purchase plan (ESPP) with a discount.

Interested in this position?

Apply directly on the company website

Apply Now

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