Backend Engineer III

About this role

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 Application Deadline: 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 and correctness across the system API performance and reliability Code quality and test coverage Velocity and throughput of shipped backend work Why You’ll Love Working Here: At Fulfillment IQ, we don’t just build supply chain solutions. We build careers, friendships, and unforgettable experiences. We believe in giving our senior technical leaders real ownership, real influence, and the opportunity to shape platforms that power real-world logistics operations. As an equal opportunity employer, we celebrate diversity and are committed to creating an inclusive environment for all team members. Here’s what makes working with us a rewarding experience: Work That Matters Build systems that directly impact global commerce and supply chain performance. Career Growth That Matters We invest in mentorship, leadership development, learning budgets, and long-term career growth. Flexibility to Thrive We support remote and hybrid work models by offering multiple office locations to help you perform at your best. We Celebrate You From team wins to work anniversaries, we recognize impact, celebrate milestones and reward performance. A Collaborative Culture Work alongside talented engineers, product leaders, and award-winning domain experts who value ownership, transparency, and high standards. Perks you’ll appreciate: Employee Health: Comprehensive health and dental coverage for you and your family Time Off: Competitive paid time off and flexible leave policies Retirement: Retirement savings programs and employer contributions Professional Growth: Dedicated learning and development budget Flexible Work: Remote and hybrid work options Perks: Equipment allowances, internet reimbursements, business travel coverage, and employee stock options (ESOP), where applicable. Communi