Senior Backend Software Engineer (Consumer Data Platform)

• The Growth Platform Engineering team builds the core systems and tools that drive user acquisition, engagement, and lifecycle growth at Affirm
• Our platform enables personalized communications, intelligent experimentation, and scalable services that help customers discover and adopt Affirm’s products
• We collaborate closely with Product, Data Science, and Experience teams to design APIs, event-driven services, and experimentation frameworks that reach millions of customers across thousands of merchants
• This team’s work directly impacts how customers experience Affirm and fuels our long-term growth
• We’re looking for a passionate Senior Software Engineer to design and build backend systems that power Affirm’s growth engine. This is a high-impact, cross-functional role that combines technical excellence with strong product intuition
• You’ll contribute to scalable, secure, and extensible services that enable Affirm to reach new customers, improve engagement, and expand our product ecosystem
• The systems you build will directly influence customer experiences and Affirm’s overall growth trajectory
• Drive planning and prioritization of projects based on product, technical, and business goals using data-driven decision making
• Design and build scalable backend systems, APIs, and data models that power communications, experimentation, and personalization
• Partner with Product Managers, Data Scientists, and Analysts to define and execute strategies for customer acquisition and engagement
• Establish and uphold engineering best practices to ensure services are secure, observable, and performant at scale
• Mentor and support junior engineers, contributing to a culture of learning, collaboration, and technical excellence
• You will support the operations and availability of your team’s artifacts by creating and monitoring metrics, escalating when needed, and supporting “keep the lights on” & on-call efforts

Benefits

• Compensation: We have a simple, flexible, and transparent remote-first compensation structure so you can make the best decisions for yourself and your family
• Spending Wallets: Access tech, food, lifestyle, and family planning wallets for your expenses
• Supportive Communities: Get involved with our employee resource groups and community groups
• Remote-first Workforce: If your role is remote, you can set up shop anywhere in your home country
• Generous Time Off: Take the time you need when life happens
• Health Benefits: Get a plan that fits your needs
• Mental Healthcare: Take care of your mind with great mental health programs
• Parental Leave: Birth and non-birth parents get 18 weeks’ paid leave. Plus, a 4-week return-to-work transition program, at full base pay
• Away Days: We offer 20 company-wide paid days off—which help our teams collectively pause to recharge
• Learning & Development: Engage in exciting learning programs to level up your growth

• Strong understanding of distributed systems, service-oriented architecture, and how architectural choices affect scalability, reliability, and maintainability
• Proven track record of delivering complex backend systems in production environments
• 6+ years of experience as a Software Engineer with a focus on backend systems
• Experience with AWS or other major cloud providers
• Demonstrated ability to collaborate effectively across Product, Data Science, Analytics, and Design teams
• Bachelor’s degree in a related field or equivalent practical experience
• Proficiency in Python, Kotlin, or similar languages (experience with both is a plus)
• Excellent written and verbal communication skills, with proficiency in asynchronous communication (design docs, technical specs, project plans, etc.)
• Experience with experimentation platforms (A/B testing frameworks, feature flagging systems)
• Exposure to large-scale personalization, recommendation, or messaging systems
• Familiarity with event-driven architectures and stream processing tools (e.g., Kafka, Kinesis)