Full-Stack Engineer III

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
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 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 Java Script

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 Type Script

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 SQL Alchemy

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…