General Information: Job Title: Full-Stack 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 Full-Stack Engineer III, you will help build a new greenfield platform that turns FIQ's supply chain expertise into software our clients and teams rely on every day. You will own features end to end, building the React (Next.js) interfaces users work in along with the Python APIs and data flows behind them. Working alongside the founding engineer, product, and design, you will ship the screens, services, and workflows that move the platform from foundation to full capability. Key Responsibilities: Build user-facing features end to end across the React frontend and the API layer Translate product requirements and designs into working, production-ready functionality Design, implement, and integrate REST API endpoints with the UI Build reusable, well-structured React components and views Ensure application performance, responsiveness, and reliability Write tests and contribute to shared engineering standards Collaborate closely with backend engineers, product, and design Participate in code review and technical discussion Help shape frontend architecture and patterns as the platform grows Must Have: 4-6 years of experience building modern web applications, with a strong frontend focus Strong hands-on experience with React and modern JavaScript Working backend experience in any modern stack, such as .NET, Python, or Node.js Experience designing and consuming REST APIs Working knowledge of relational databases and SQL (PostgreSQL or similar) Working knowledge of TypeScript Ability to translate product requirements and designs into production-ready features Strong engineering fundamentals across code quality, testing, 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 and SQLAlchemy Experience building data-heavy interfaces such as dashboards, tables, or visualizations Familiarity with CI/CD pipelines and cloud deployment Experience contributing to greenfield or early-stage products Exposure to logistics, supply chain, or data-intensive SaaS platforms What Success Looks Like in the First 90 Days: 30 Days In Ramp up on the codebase, technology stack, and product vision Set up local development and deployment environments Ship your first small features across the stack Build working relationships across the team 60 Days In Take ownership of a meaningful feature area Deliver production features that span frontend and backend Contribute to shared UI components and frontend patterns Actively participate in technical design and code review 90 Days In Independently own features from specification through production Improve frontend architecture, standards, and reusability Demonstrate consistent, measurable delivery velocity Help raise the quality bar for the growing team Key Performance Indicators (KPIs): Consistent delivery of production features across the full stack Quality, performance, and reliability of the user-facing application Code quality and test coverage Velocity and throughput of shipped work Effectiveness of collaboration with product, design, and engineering 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 t