Software Development Engineer II

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 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're not an ML research company. We don't train custom models or build novel architectures. The work is about integrating and productizing 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

• You have 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 

• You have worked in environments where engineers are expected to clarify the problem, make tradeoffs, 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 it’s actually like here: 

Fulfil is bootstrapped, profitable, and growing. No VC-driven bloat, no alignment meetings about alignment meetings. Everyone ships every day.

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 tradeoffs 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 environment. 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.

About Fulfil

Fulfil is the modern ERP for commerce. Built to power the fastest-growing eCommerce brands, our platform brings together order management, inventory, accounting, and more, turning complex operations into a strategic advantage.

We’re trusted by brands like HexClad, Ridge Wallet, Caraway, and Resident, and backed by people who want to change the way merchant operations are run. We believe in deep work, radical accountability, and building tools that let sharp people move faster.