Senior Software Engineer, Backend – AI Platform

🔥 1 hour ago

🇺🇸 United States – Remote

💵 $173k - $233k / year

⏰ Full Time

🟠 Senior

🔙 Backend Engineer

🦅 H1B Visa Sponsor

This company has sponsored H1B visas in the past.

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Affirm

WebsiteLinkedInAll Job Openings

1001 - 5000 employees

Founded 2012

💳 Fintech

👥 B2C

🛍️ eCommerce

💰 Post-IPO Equity on 2021-01

Fintech • B2C • eCommerce

Affirm is a financial technology company that offers a 'Buy Now, Pay Later' service, allowing consumers to make purchases and pay for them over time with flexible payment plans. Affirm eliminates hidden fees and compound interest, providing clear terms and conditions for its users. The company also offers the Affirm Card, a debit card that allows users to request to pay over time for larger purchases or pay in full for smaller ones. Affirm partners with various retailers across multiple categories, including electronics, apparel, and travel, providing customers with the convenience of paying over time at checkout both online and in physical stores. Affirm's services are integrated with Apple Pay, enabling customers to make payments seamlessly from their iPhone or iPad.

📋 Description

• Plan, execute, and own technical decisions and projects within the AI Platform team from design through launch and on-call • Design and build gateway, runtime, and evaluation services for scaling AI workloads across millions of users and transactions • Build identity, quota, routing, caching, and failover controls for attributable and governable AI spending • Partner with security, infrastructure, and product engineering teams on guardrails for agentic workloads and tool-access identity • Create and monitor system metrics and own operational health, including monitoring, alerting, runbooks, and on-call • Set and improve code review and design standards through writing and tech talks • Use AI tools and agentic workflows in coding, design review, and operations • Educate, mentor, and grow engineers while driving design, coding, and testing best practices

🎯 Requirements

• 4+ years of experience designing, developing, and launching backend systems at scale • Experience using languages such as Python or Kotlin • Track record developing highly available distributed systems • Experience with AWS, MySQL, and Kubernetes • Practical production experience with LLMs, agents, or AI frameworks • Experience with inference APIs, LLM gateways such as LiteLLM, MCP, tool calling, evals, or agent runtimes • Understanding of AI usage and infrastructure for AI workloads • Experience defining technical plans for significant features or system components • Ability to write high-quality, understandable, and reusable code • Proficiency making significant changes in large codebases safely • Strong verbal and written communication skills • Equivalent practical experience or a Bachelor’s degree in a related field

🏖️ Benefits

• Equity rewards may be included in total compensation • Monthly stipends for health, wellness, and tech spending • 100% subsidized medical coverage for employees and dependents • Dental and vision coverage for employees and dependents • Flexible time off • Generous holiday calendars • Employee stock purchase plan (ESPP) with discounted Affirm stock • Remote-first flexibility • In-person onboarding experience • Inclusive interview process and disability accommodations

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