Senior Software Engineer, Backend – AI Platform

🕒 October 30

🇨🇦 Canada – Remote

💵 $153k - $213k / year

⏰ Full Time

🟠 Senior

🔙 Backend Engineer

👻 Ghost score 1%

What it means: the chance that no one is really hiring for this job.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.Why this score:

• Open for 15 days.
• Jobs at this company usually fill in 57 days.

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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 taking AI workloads from pilot to production • Build identity, quota, routing, caching, and failover controls for attributable and governable AI spend • 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 through 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 for 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 using languages like Python or Kotlin • Track record of developing highly available distributed systems using AWS, MySQL and Kubernetes • Practical production experience with LLMs, agents, or AI frameworks, including inference APIs, LLM gateways, MCP, tool calling, evals, or agent runtimes • Understanding of AI usage and infrastructure supporting AI workloads • Experience defining technical plans for significant features or system components • Ability to write high-quality, understandable code • Proficiency making significant changes in a large code base safely • Strong verbal and written communication skills • Equivalent practical experience or a Bachelor’s degree in a related field • Must reside in Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia, Ontario, Prince Edward Island, or Saskatchewan

🏖️ Benefits

• Equity rewards may be included in the total compensation package • 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) allowing employees to buy Affirm stock at a discount • Inclusive interview process with accommodations for candidates with disabilities • In-person onboarding experience

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