Senior Backend Software Engineer (Fintech)

TL;DR

Senior Backend Software Engineer (Fintech): Building and scaling a new lifecycle-orchestrator service for a global merchant platform with an accent on distributed systems, API design, and architectural simplification. Focus on executing technical strategy for complex requirements, mentoring engineers, and modernizing core codebase components.

Location: Must be based in the United States

Salary: $173,000–$255,000 per year (depending on location)

Company

Affirm is a financial technology company reinventing credit by providing flexible payment solutions without hidden fees.

What you will do

• Design and expand the platform backbone to support hundreds of thousands of global merchants.
• Build a new lifecycle-orchestrator service to improve system availability and isolation.
• Drive cross-team projects and align technical scope with stakeholders.
• Mentor engineers to foster their professional development and growth.
• Execute technical strategy for complex, open-ended problems beyond the immediate team.
• Improve engineering standards and utilize agentic development tools to automate workflows.

Requirements

• Must be based in the United States
• 5+ years of experience as a backend software engineer.
• Strong understanding of Domain-Driven Design and distributed systems.
• Proficiency in API design (HTTP/RPC), state machines, event-driven architecture, and database design.
• Excellent written communication skills for technical documentation and ADRs.
• Experience with AWS, gRPC, Kotlin, Python, MySQL, and Kubernetes.

Nice to have

• Experience with Java.
• Familiarity with monitoring tools like Sentry, Rollbar, Chronosphere, or Kibana.

Culture & Benefits

• 100% subsidized medical, dental, and vision coverage for employees and dependents.
• Generous stipends for technology, food, and lifestyle needs.
• Competitive vacation and holiday schedules.
• Employee stock purchase plan (ESPP) with discounted shares.
• Remote-first culture with occasional office collaboration.