Senior Software Engineer, Back-end (Fraud)

Affirm
Poland
Workplace: RemoteFull timePLN 308,000 - 428,000 annuallyFunction: Software EngineeringSkills: ["Communication","Collaboration","Ownership","Mentorship","Problem-solving"]

Build and evolve real-time fraud decisioning services and APIs, extending the fraud decisioning system into new international markets. Own backend design and delivery, integrate region-specific fraud and risk vendors, and operationalize ML/AI signals for fast, secure decisions. Create and monitor metrics to support availability and on-call readiness, collaborate cross-functionally with Product, ML, Analytics, and Fraud Strategy, and mentor teammates through ambiguity and quality-focused standards.

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FursaFursa
Affirm
Affirm
1 month ago

Senior Software Engineer, Back-end (Fraud)

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI
Last checked: 5 hours agoStatus: Live
Reposted: similar role first listed 6 months ago

Job Summary

Build and evolve real-time fraud decisioning services and APIs, extending the fraud decisioning system into new international markets. Own backend design and delivery, integrate region-specific fraud and risk vendors, and operationalize ML/AI signals for fast, secure decisions. Create and monitor metrics to support availability and on-call readiness, collaborate cross-functionally with Product, ML, Analytics, and Fraud Strategy, and mentor teammates through ambiguity and quality-focused standards.
Location: Poland
Workplace: Remote
Employment Type: Full time
Job Function: Software Engineering
Seniority: Mid level

Key Responsibilities

  • •Own and deliver quarterly goals, leading engineers through ambiguity and ensuring delivery support.
  • •Design and implement real-time fraud decisioning services and APIs in Python or Kotlin for markets beyond the US.
  • •Build and evolve the platform and tooling to launch fraud decisioning in new countries with repeatable, low-friction processes.
  • •Integrate region-specific fraud and risk vendors and help operationalize ML/AI signals used for real-time decisioning.
  • •Support system operations and availability via metrics, escalation, on-call/keep-the-lights-on efforts, and set/upgrade code review and design standards.

Pay and Benefits

Salary: PLN 308,000 - 428,000 annually
Equity and Bonus:Equity
Perks:Health InsuranceDentalVisionRemote WorkLearning BudgetParental LeaveEquity

Key Requirements

  • •5+ years 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, including directing and reviewing AI-generated code for correctness, quality, and security.
  • •Proficiency in SQL and working with data-rich environments, plus familiarity with CI/CD and safe production deployments.
Experience:Fraud preventionRisk systemsReal-time decisioningFintechAI-driven engineering
Skills:CommunicationCollaborationOwnershipMentorshipProblem-solving
Languages:English
Tech Stack:PythonKotlinAWSMySQLPostgreSQLKubernetesSQLCI/CDSnowflakeDbtAirflowChronosphereClaude CodeAI

Company Brief

Affirm
Provides point-of-sale lending and buy-now-pay-later (BNPL) solutions for consumers and merchants, enabling installment payments, consumer financing, and embedded financial services through APIs and partnerships with retailers and platforms.
Industry: Lending
Company Size: Enterprise (1,001+ employees)
Revenue: USD 1B+
Growth: Public Company
Valuation: Public Company (Market Cap in USD)
Funding: IPO / Publicly Listed
Headquarters: San Francisco, United States
Founded: 2012
WebsiteLinkedIn