Software Development Engineer Ii (Toronto)

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 modernise legacy systems while keeping pace with new feature delivery Participate in code reviews and architecture discussions: raise the bar and expect the same in return Our Approach to AI

We use LLMs to embed AI capabilities into Fulfil's ERP: natural language interfaces, intelligent automation, and merchant‑facing insights. The Fulfil x MCP integration with Claude is a good example of the direction we're heading. We are not an ML research company. We don't train custom models or build novel architectures. The work is about integrating and productising AI to solve real commerce problems. We also expect engineers to be AI‑native in their own workflow: using AI tools to move faster while maintaining strong review discipline, security awareness, and ownership of the final code. What We're Looking for

3 to 5 years of Python engineering experience building production systems Proven experience owning web applications end to end - not just backend services, but the full product surface, including UI and API contracts Primarily built user‑facing web applications or product workflows, not only internal tools, ETL pipelines, infrastructure, or isolated backend services Solid fundamentals with ORMs (SQLAlchemy or Django ORM), PostgreSQL, and relational data modelling Experience with distributed systems: Celery, Redis, RabbitMQ, or similar background processing tools Comfortable writing automated tests with pytest and working collaboratively in Git A track record of seeing projects through from design to deployment to ongoing support, not just closing tickets Worked in environments where engineers are expected to clarify the problem, make trade‑offs, and ship without heavy product or project management layers Nice to have

Domain experience in commerce, logistics, or FinTech, order management, inventory, payments, reconciliation Hands‑on LLM integration in production features, not just personal projects Familiarity with Google Cloud, Heroku, or similar platforms What You Get in Return

Real ownership over problems that matter Direct access to decision‑makers The satisfaction of seeing your code run in production for brands doing $10M–$100M in revenue Unlimited PTO, we actually want you to use You’ll thrive here if you value direct, specific feedback, are comfortable discussing trade‑offs openly in Slack and code reviews, and can separate critique of the work from critique of the person. This is not a clock‑in, clock‑out engineering setting. Most weeks should be sustainable, but when merchant‑impacting issues arise, we expect engineers to stay engaged, communicate clearly, and help drive the issue to resolution.

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