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 systems for orchestration, delivery, preferences, templates, and observability
• Collaborate with product management, design, analytics, security, and engineering partners throughout the product lifecycle
• Articulate technical constraints and balance customer impact, risks, and trade-offs
• Design, implement, and operate resilient integrations with external messaging vendors
• Identify and solve issues affecting scalability, developer experience, and operational resilience
• Define service-level objectives and metrics
• Improve alerting and incident response
• 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 to team members
• 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 designing abstractions for different capabilities, rate limits, and failure modes
• Experience defining technical plans for significant features or system components
• Ability to write high-quality, understandable, and reusable code
• Proficiency making significant changes in a large code base safely
• Proficiency with AI-assisted development tools and sound judgment validating their outputs
• Strong verbal and written communication skills
• Participation in an on-call rotation is required

• Equity rewards from Affirm Holdings, Inc.
• Monthly health, wellness, and technology spending stipends
• 100% subsidized medical coverage for employees and dependents
• Dental and vision coverage for employees and dependents
• Flexible spending wallets for technology and wellbeing needs, reimbursable up to 1390 zł per month
• Competitive paid time off
• Paid public holidays
• Additional paid Away Days
• Comprehensive private healthcare through Lux Med's Platinum package
• MultiSport card
• Learning and development programs
• Family healthcare support through Maven
• Parental leave support through Parentaly
• Mental well-being support through Lyra, including up to 12 confidential counseling or coaching sessions annually for employees and household members
• Financial well-being support through Northstar, with unlimited access to Certified Financial Advisors and planning tools at no cost
• Employee Resource Groups (ERGs)
• Eligibility for creative tax benefits, subject to applicable law, role, and company policy
• Employee stock purchase plan (ESPP) allowing employees to buy Affirm stock at a discount
• Inclusive interview process and accommodations for candidates with disabilities