Job Opportunities API

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 i