Senior Software Engineer, Back-end (Fraud)

Overview

Job Description

Responsibilities

• - Own and deliver quarterly goals for your team
• - Lead engineers through ambiguity to solve open-ended problems
• - Design and implement backend services and APIs using Python or Kotlin
• - Shape the team’s roadmap and collaborate on technical design
• - Drive execution across projects that span multiple teams
• - Partner with the Engineering Manager to elevate quality standards
• - Collaborate with stakeholders to build scalable fraud tooling and infrastructure
• - Identify opportunities to improve system reliability and team efficiency
• - Maintain high observability standards and respond to incidents
• - Mentor teammates and uphold high code and design standards
• - Participate in the on-call rotation

Required Skills

• - 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 with data-rich environments
• - Familiarity with CI/CD practices and safe production deployments
• - Strong written and verbal communication skills
• - 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 post-transaction tooling (nice to have)
• - Experience working in the fintech sector or other highly regulated environments (nice to have)

Benefits

• - 100% subsidized medical coverage, dental and vision for you and your dependents
• - Flexible Spending Wallets for tech, food and lifestyle
• - Away Days - wellness days to take off work and recharge
• - Learning & Development programs
• - Parental benefits
• - Employee Resource & Community Groups
• - Competitive vacation and holiday schedules
• - Employee stock purchase plan enabling you to buy shares of Affirm at a discount