Staff Software Engineer, Backend (Cost Engineering)

Affirm; Kelowna; On-site; CAD 150,000 - 210,000; Full time

Job summary

Affirm is seeking a Staff Cost Engineer to bridge finance, infrastructure, and data engineering. You will design tooling, automation, and processes that scale cost governance across a fast-growing multi-cloud and multi-AI-vendor footprint.

You'll set the technical direction for the cost team, influence policy with infrastructure and platform leads, and drive clarity in spend decisions across the organization.

Responsibilities

• Operate at the intersection of finance, infrastructure, and data engineering - designing the tooling, automation, and processes that scale cost governance across a fast-growing multi-cloud and multi-AI-vendor footprint.
• Set technical direction for the cost engineering team, influence cost strategy with infra and platform leaders across the organization, and drive clarity in spend decisions.

Job description

Affirm is reinventing credit to make it more honest and friendly, giving consumers the flexibility to buy now and pay later without any hidden fees or compounding interest.

Engineering owns cost visibility and optimization across affirm's cloud and AI infrastructure. We're the team that tells the business what it's spending, why it's changing, and what to do about it - from AWS resource waste and tagging strategy to the newer frontier of AI/LLM spend across the company's growing set of AI tools. We treat cost anomalies with the same rigor as production incidents: we've built a severity framework (mirroring affirm's SEV0-3 incident model but mapped to dollar impact) with defined detection sources, TTD/TTR metrics, and escalation paths, and we operate a clear RACI with partner orgs - we own visibility and alerting, and partner teams own remediation (at times we may dig in deep and own remediation too!), so accountability never gets diffuse.

As a Staff Cost Engineer, you'll operate at the intersection of finance, infrastructure, and data engineering - designing the tooling, automation, and processes that scale cost governance across a fast-growing multi-cloud and multi-AI-vendor footprint. You'll set technical direction for the team, influence cost strategy with infra and platform leaders across the org, and turn ambiguous \