Remote opportunity at
AffirmSenior Software Engineer, Backend (AI Platform)
Affirm operates a financial network offering predictable payment options for consumers without hidden fees or surprises. The engineering organization builds fault-tolerant, large-scale global infrastructure utilized by…
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About This Role
Affirm operates a financial network offering predictable payment options for consumers without hidden fees or surprises. The engineering organization builds fault-tolerant, large-scale global infrastructure utilized by various financial products and merchants. Within this organization, the AI Platform team manages the path for creating, operating, testing, and governing artificial intelligence systems for internal engineering customers and production workloads. As a Senior Software Engineer, Backend (AI Platform) , you will manage technical…
Job Description
Affirm operates a financial network offering predictable payment options for consumers without hidden fees or surprises. The engineering organization builds fault-tolerant, large-scale global infrastructure utilized by various financial products and merchants. Within this organization, the AI Platform team manages the path for creating, operating, testing, and governing artificial intelligence systems for internal engineering customers and production workloads.
As a Senior Software Engineer, Backend (AI Platform), you will manage technical decisions and projects across the lifecycle from design through production launch and ongoing support. This remote-first role focuses on engineering the gateways, runtimes, and evaluation mechanisms required to scale AI workloads safely across millions of users and transactions. You will establish cost controls, identity frameworks, routing policies, and caching layers so engineering teams can adopt new models and tools efficiently. The position also involves leveraging agentic workflows and AI tools daily, monitoring system health through alerts and runbooks, and mentoring team members on engineering standards.
Responsibilities
- Plan and execute technical projects for the AI Platform team from initial design through deployment and on-call maintenance.
- Build gateway, runtime, and evaluation services to scale AI workloads securely for millions of users.
- Implement identity, quota, routing, caching, and failover controls for AI cost attribution and governance.
- Collaborate with security, infrastructure, and product teams to establish guardrails and identity models for agentic workloads.
- Monitor system health by creating metrics, alerts, and operational runbooks while managing on-call duties.
- Advocate for code review and design standards through technical documentation and internal talks.
- Utilize AI tools and agentic workflows daily to accelerate code delivery, design reviews, and operational tasks.
- Mentor and guide engineers on coding practices, testing, and system design.
Requirements
- Four or more years of backend engineering experience designing, building, and launching large-scale systems using Kotlin or Python.
- Track record of developing highly available distributed systems using technologies such as Kubernetes, AWS, and MySQL.
- Practical production experience building with large language models, agents, or AI frameworks including inference APIs, LLM gateways, Model Context Protocol, tool calling, and evaluation runtimes.
- Demonstrated ability to write clear, maintainable code and make safe, large-scale changes within a major codebase.
- Strong verbal and written communication skills for cross-functional collaboration within a global engineering organization.
Qualifications
- Equivalent practical experience or a Bachelor degree in a related technical discipline.
Core Skills
Benefits
- 100% subsidized medical coverage, dental, and vision insurance for employees and dependents
- Monthly stipends to support technology setups, health, and wellness choices
- Flexible time off combined with holiday schedules
- Employee stock purchase plan offering discounted Affirm stock
- Remote-first work environment with occasional in-person onboarding
Frequently Asked Questions
Answers are based only on the employer’s listing; where it doesn’t say, neither do we.
Is this role remote?
Yes, Affirm operates as a remote-first company, allowing most roles to be performed from anywhere within the country of employment, though new hires are invited to an in-person onboarding experience.
What is the salary range for this position?
The annual base pay range is USD 195,000 to 255,000 for specific states including California, Washington, New York, New Jersey, and Connecticut, and USD 173,000 to 233,000 for all other U.S. states.
What experience is required to apply?
Candidates must have four or more years of background designing and launching large-scale backend systems in Python or Kotlin, experience with distributed systems like AWS, MySQL, and Kubernetes, and practical exposure to production LLMs, agents, or AI frameworks.
Sample Interview Questions
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