Senior Software Engineer – Comms Core

• Own and deliver quarterly technical goals for the Communications area
• Solve ambiguous, open-ended problems across messaging infrastructure
• Design and evolve reliable backend services for high-volume communications across multi-region, multi-tenant environments
• Build orchestration, delivery, preferences, templates, and observability capabilities
• Collaborate with product management, design, analytics, security, and engineering partners throughout the product lifecycle
• Design, implement, and operate resilient integrations with external messaging vendors
• Balance reliability, latency, cost, and compliance
• Identify and solve issues affecting scalability, developer experience, and operational resilience
• Define service-level objectives and metrics, improve alerting and incident response, and participate in on-call efforts
• Improve design, testing, code review, rollout, and operational standards
• Advocate for engineering standards through writing and tech talks
• Provide feedback, mentorship, and technical direction
• Lead by example

• 5+ years of experience in software development or engineering
• Deep understanding of system design and architecture
• Proficiency in modern programming languages such as Python, Kotlin, or similar
• Track record developing highly available distributed systems using AWS, MySQL, DynamoDB, and Kubernetes
• Experience designing multi-region, multi-tenant platforms with strong isolation, scalability, failure recovery, and data-consistency guarantees
• Experience integrating with third-party communications or messaging vendors
• Experience defining technical plans for significant features or system components with elegant, simple, and extensible designs
• High-quality, readable code development
• Proficiency making significant changes in a large code base
• Proficiency with AI-assisted development tools and sound judgment validating their outputs
• Strong verbal and written communication skills
• Required participation in an on-call rotation
• Must be based in Spain

• Monthly stipends for health, wellness and tech spending
• 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
• Health coverage at no cost: 100% of premiums for employees and their dependents
• Flexible time off and generous holiday calendars
• Employee stock purchase plan (ESPP) to buy Affirm stock at a discount
• Inclusive interview process and accommodations for candidates with disabilities
• In-person onboarding experience for all new hires