Senior Software Engineer, Backend – AI Platform

This is a fully remote position, open to applicants in Canada.

📋 Description

• Lead the planning, execution, and ownership of technical projects and decisions within the AI Platform team, overseeing everything from design to launch and on-call responsibilities.

• Create and develop gateway, runtime, and evaluation services to scale AI workloads for millions of users and transactions.

• Implement identity, quota, routing, caching, and failover mechanisms for accountable and manageable AI expenditure.

• Collaborate with security, infrastructure, and product engineering teams to set up guardrails for agentic workloads and manage tool access identities.

• Develop and track system metrics, ensuring operational health through monitoring, alerting, runbooks, and on-call duties.

• Enhance code review and design standards by engaging in writing and tech talks.

• Utilize AI tools and agentic workflows for coding, design reviews, and operational tasks.

• Mentor and educate engineers while promoting best practices in design, coding, and testing.

⛳️ Requirements

• A minimum of 4 years of experience in designing, developing, and launching scalable backend systems.

• Proficiency in programming languages such as Python or Kotlin.

• Proven experience in developing highly available distributed systems.

• Familiarity with AWS, MySQL, and Kubernetes.

• Hands-on production experience with LLMs, agents, or AI frameworks, including inference APIs, LLM gateways, MCP, tool calling, evaluations, or agent runtimes.

• Understanding of AI implementation and infrastructure for AI workloads.

• Experience in defining technical roadmaps for major features or system components.

• Capability to produce high-quality, comprehensible code.

• Skill in making substantial changes to a large codebase safely.

• Strong verbal and written communication abilities.

• Equivalent practical experience or a Bachelor's degree in a relevant field.

• Must be a resident of Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia, Ontario, Prince Edward Island, or Saskatchewan.

🏝️ Benefits

• Equity rewards may be part of the overall compensation package.

• Monthly stipends for health, wellness, and technology-related expenses.

• 100% subsidized medical coverage for employees and their dependents.

• Dental and vision coverage for employees and their dependents.

• Remote-first work arrangement with flexibility within the country of employment.

• Flexible time off policy.

• Generous holiday calendar.

• Employee stock purchase plan (ESPP) allowing the purchase of Affirm stock at a discounted rate.

• An inclusive interview process with accommodations for candidates with disabilities.

• In-person onboarding experience for all new hires.