Affirm

Senior Software Engineer, Backend (AI Platform)

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2 hours ago
Remote, United StatesSenior
H1B sponsor

Base Salary

$173k - $255k/yr

Responsibilities

  • Own technical decisions and projects from design through launch and on-call operations.
  • Design and build scalable gateway, runtime, and evaluation services for AI workloads.
  • Develop identity, quota, routing, caching, failover, cost attribution, and governance controls for AI systems.
  • Partner with security, infrastructure, and product engineering teams on agentic workload guardrails and tool-access identity.
  • Create and monitor system metrics, alerts, runbooks, and operational health practices.
  • Improve code review and design standards, communicate practices through writing and technical talks, and mentor engineers.

Requirements

  • At least 4 years of experience designing, developing, and launching large-scale backend systems.
  • Experience building highly available distributed systems with technologies such as Python or Kotlin, AWS, MySQL, and Kubernetes.
  • Production experience with LLMs, agents, or AI frameworks, including inference APIs, LLM gateways, MCP, tool calling, evaluations, or agent runtimes.
  • Experience defining technical plans and delivering significant features or system components with simple, extensible designs.
  • Ability to make significant changes safely in large codebases and write high-quality, maintainable code.
  • Strong verbal and written communication, ownership, collaboration, and growth mindset.
  • Bachelor’s degree in a related field or equivalent practical experience.

Benefits

  • Remote-first work arrangement with flexibility within the country of employment and occasional office work where required.
  • In-person onboarding experience for all new hires.
  • 100% subsidized medical, dental, and vision coverage for employees and dependents.
  • Monthly technology, health, and wellness spending stipends.
  • Flexible time off and generous holiday calendars.
  • Employee stock purchase plan with discounted Affirm stock.
  • Inclusive interview process with accommodations for candidates with disabilities.
Affirm

About Affirm

1,001-5,000 employees

Affirm provides buy now, pay later installment financing at online and in-store checkout, along with a consumer app and virtual card, for shoppers and merchants. It monetizes through merchant fees and interest on select loans, with no late fees. Founded in 2012 and headquartered in San Francisco, Affirm is a public company listed on NASDAQ that powers payments for thousands of ecommerce retailers.

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