Backend Engineer III

General Information:

Job Title: Backend Engineer III
Location: Toronto (Onsite/ Hybrid)
Job Type: Full-Time
Hiring Timeline: Immediate
Reporting Line: Head of R&D
Existing Vacancy: Yes
Final date to receive applications: Open until Filled
Salary Range: $105-125K CAD per year (negotiable)

About Fulfillment IQ (FIQ):

Fulfillment IQ is a supply chain engineering and transformation company that helps brands, retailers, and 3PLs design, build, and scale high-performance logistics operations.

We work at the intersection of strategy, operations, and technology where we solve complex, real-world problems across warehouse design, automation, order management, transportation, and end-to-end supply chain execution.

Our teams combine deep domain expertise with strong technical capability, delivering outcomes through consulting, systems implementation, and proprietary platforms that accelerate time-to-value and reduce delivery risk.

If you enjoy working in complex environments, partnering closely with clients, and seeing your work make a tangible impact on how global commerce moves, this is the place where your skills and judgment truly come to life.

Role Overview

As a Backend Engineer III, you will build the services, data models, and APIs that power a new greenfield platform at the core of FIQ's supply chain technology. You will write the business logic and processing workflows that everything else depends on, with a focus on data integrity, correctness, and performance. Working alongside the founding engineer and full-stack team, your work will form the reliable backbone the rest of the product is built on.

Key Responsibilities:

• Design and build backend services, APIs, and data models
• Implement business logic and processing workflows
• Design relational schemas and manage database migrations
• Ensure data integrity, correctness, and API performance
• Write tests and contribute to shared engineering standards
• Integrate with external systems and data sources
• Collaborate closely with full-stack engineers, product, and the platform's technical owner
• Participate in code review and technical design
• Help evolve the backend architecture as the platform scales

Must Have:

• 4-6 years of experience building backend services and APIs
• Strong, hands-on Python fluency; you will write production Python from day one
• Experience designing and building REST APIs, ideally with FastAPI, Flask, or Django
• Strong relational database skills, including schema design and SQL (PostgreSQL or similar)
• Experience with ORMs and data modeling
• Ability to translate requirements into robust, production-ready backend systems
• Strong engineering fundamentals across performance, reliability, and maintainability
• Comfort operating in a fast-moving, early-stage environment with high ownership

Nice to Have:

• Experience with AI-driven development and AI-assisted engineering workflows
• Experience with LLM-integrated development, including RAG and retrieval-augmented patterns
• Experience with FastAPI, SQLAlchemy, and Alembic
• Experience with multi-tenant systems or complex data models
• Experience building workflow engines, pipelines, or DAG-based processing
• Familiarity with CI/CD, containers (Docker), and cloud infrastructure
• Experience with calculation engines, rules engines, or deterministic data pipelines
• Exposure to logistics, supply chain, fintech, or data-intensive SaaS platforms

What Success Looks Like in the First 90 Days:

30 Days In

• Ramp up on the codebase, data model, and product domain
• Set up local development and deployment environments
• Ship your first backend changes and endpoints
• Build working relationships across the team

60 Days In

• Take ownership of a backend service or feature area
• Deliver production-grade APIs and data models
• Contribute to backend standards and shared patterns
• Actively participate in technical design and code review

90 Days In

• Independently own backend features from design through production
• Improve reliability, performance, and data integrity across services
• Demonstrate consistent, measurable delivery velocity
• Help raise the engineering quality bar for the growing team

Key Performance Indicators (KPIs):

• Consistent delivery of production-ready backend services and APIs
• Data integrity…