SDE 2 - Full Stack

As a Python Engineer (Full Stack and AI) at Fulfil, you will design and build next-generation systems that power millions of customer orders and financial transactions for some of the world's fastest-growing merchants. Our Python-based platform operates at a significant scale, handling millions of transactions per hour. Your work will have a direct impact on system reliability, scalability, and product innovation. You'll collaborate closely with teammates across Canada, the U. S., and India, working in a highly ownership-driven environment that values clean architecture, pragmatic engineering, and thoughtful problem-solving.

The core responsibilities for the job include the following:

Own the Full Stack:

• Design, build, and maintain end-to-end functionality across our Python-based platform, from backend services to frontend integrations.
• Work within a large, mature codebase while contributing to its long-term evolution and scalability.

Deliver Features at Speed:

• Lead the design, development, testing, and deployment of new features that directly support high-growth merchants.
• Balance rapid delivery with long-term maintainability.

Apply AI in Production:

• Integrate AI-powered capabilities into Fulfil's ERP using LLMs (e. g., OpenAI, Anthropic).
• Build intelligent workflows that enhance automation, decision-making, and merchant experience across orders, financials, and operations.

Scale with Confidence:

• Design and optimize REST and GraphQL APIs (600+ endpoints), microservices, and background processing pipelines.
• Work with containerized infrastructure (Docker/Kubernetes) to support high availability and zero-downtime deployments.

Champion Code Quality:

• Refactor and modernize legacy systems.
• Write well-tested, readable code using pytest.
• Participate in code reviews and architectural discussions to raise the bar across the team.

Build Ecosystem Integrations:

• Develop and maintain integrations with major commerce platforms (Shopify, Amazon) and logistics providers (FedEx, DHL).
• Ensure reliable data flows across external systems and Fulfil's core platform.

Requirements:

• 5+ years of experience, ideally, building applications at scale from scratch.
• Strong experience building large-scale backend systems and microservices using Python.
• Hands-on experience with ORMs (e. g., SQLAlchemy, Django ORM) and relational databases (PostgreSQL preferred).
• Proficiency with distributed systems components such as Celery, Redis, RabbitMQ, and background processing.
• Experience writing automated tests (pytest) and using Git in a collaborative environment.
• Demonstrated ownership, seeing projects through from design to production and ongoing support.