Software Development Engineer II

Job description

About the Role: As an SDE-II at Fulfil, you own features, not tickets. That means taking a problem from first principles all the way to production: designing the data model, building the backend service, wiring the frontend, writing the tests, and keeping it healthy after it ships. Our platform handles millions of orders and financial transactions for some of the fastest-growing eCommerce brands. You'll work inside a large, mature Python codebase and ship changes that merchants feel the same day. Location: Toronto, ON (in-office during onboarding; hybrid 3 days/week in office after) Type: Full-Time: Expected Start Date: Immediately: What You’ll Do: Build and ship web application features end-to-end: backend, API layer, and frontend, without handing off to specialists Own what you build in production: monitoring, debugging, and fixing issues when they surface Design and maintain REST and GraphQL APIs across a platform with 600+ endpoints Integrate LLM-powered features (OpenAI, Anthropic) into merchant workflows: order management, financial analysis, logistics Build and maintain integrations with Shopify, Amazon, FedEx, DHL, and other commerce platforms Refactor and modernize legacy...