153K–213K CAD / year
Senior Software Engineer, Backend (Cost Engineering)
BackendRemote — Canada
Published on 2026-10-21
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About this role
Build and maintain statistical capacity models that translate traffic forecasts into infrastructure requirements and recommended capacity settings. Help ensure Affirm’s systems can safely handle forecasted demand, including major sales events.
About the company
Affirm offers buy now, pay later financing that lets consumers split purchases into transparent installment payments at checkout. It partners with merchants to provide flexible credit options without late fees.
The team
Capacity Modeling team
Stack
PythonKotlinAWSMySQLKubernetes
What you'll do
- Own quarterly team goals and guide engineers through ambiguous problems
- Collaborate with product, design, analytics, and stakeholders on technical decisions and trade-offs
- Identify and lead solutions to project, process, technology, and business issues
- Monitor team artifacts, support availability, and participate in on-call operations
- Set and improve code review and design standards; mentor and develop teammates
What we're looking for
- 4+ years designing, developing, and launching scalable backend systems
- Experience building highly available distributed systems
- Experience supporting large-scale sales events
- Experience tuning autoscaling, CPU and memory usage, and multithreading for compute workloads
- Ability to plan and deliver significant system components with simple, extensible designs
- Strong coding, communication, and collaboration skills
Benefits
- 100% subsidized medical, dental, and vision premiums for employees and dependents
- Monthly technology and health and wellness stipends
- Flexible time off and generous holiday calendars
- Employee stock purchase plan with discounted shares