Shape reliable capacity plans with Python or Kotlin as a Senior Backend Engineer on Affirm’s remote Canada Capacity Modeling team. Forecast traffic and tune resources for peak demand.

This senior position owns quarterly goals while guiding engineers through ambiguous, open-ended problems. You will build backend systems at scale using AWS, MySQL, or Kubernetes. The work connects statistical models with CPU, memory, connections, pod counts, HPA ranges, and infrastructure sizing. You will help ensure Affirm can handle major sales events safely.

Key Responsibilities:

Own quarterly team goals and guide engineers through delivery

Collaborate with product, design, and analytics stakeholders

Identify and resolve project, process, technology, and business issues

Monitor metrics and support availability, operations,



and on-call efforts

Improve code review and design standards through writing and tech talks

Requirements:

Four-plus years designing and launching backend systems at scale

Python or Kotlin experience with highly available distributed systems

AWS, MySQL, and Kubernetes experience

Autoscaling, CPU, memory, and multithreading tuning experience

Equivalent practical experience or a related bachelor’s degree

Bring backend engineering, capacity modeling, and distributed systems expertise to help Affirm scale reliably across remote Canada.

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📌 Senior Backend Developer - Remote Working (Montreal)
🏢 Affirm
📍 Montreal