Full Stack Engineer – Headless E-Commerce (Canada)

We are seeking a Principal Full-Stack Engineer – Headless E-Commerce to lead the design, development, and evolution of our modern commerce platform. This role is responsible for building scalable backend services and APIs using Node.js and JavaScript/TypeScript, while also contributing to frontend experiences with React.

The ideal candidate will take ownership of features end-to-end, collaborate closely with Product and Design, and play a key role in shaping architecture, standards, and engineering best practices. This position requires strong expertise in backend development, experience with full-stack environments, and the ability to work in a fast-paced, evolving ecosystem, including headless commerce solutions such as Medusa JS.

In addition to hands-on development, this role will mentor team members, support production systems, and drive continuous improvement to ensure high-quality, scalable, and efficient solutions aligned with business goals.

1. Key Responsibilities:

• Design and build backend features using Node.js, JavaScript/TypeScript, and modern frameworks
• Develop and evolve APIs, services, and domain logic that power our commerce platform
• Work across the stack, including:
  
  • Backend services and integrations
  • Storefront and admin experiences using React
• Learn and extend Medusa JS as needed, including:
  
  • Custom services and modules
  • Plugins and integrations (payments, fulfillment, notifications)
• Collaborate closely with Product and Design to translate requirements into thoughtful technical solutions
• Own features end‑to‑end: design, implementation, testing, deployment, and iteration
• Contribute to architectural decisions and platform standards
• Review code, mentor teammates, and help raise engineering quality
• Participate in production support and continuous improvement efforts

1. Position Requirements:

• Bachelor’s Degree in Information Technology or equivalent experience.
• 5+ years of professional experience building applications with Node.js and JavaScript/TypeScript
• Strong backend engineering fundamentals
  
  • API design (REST, webhooks)
  • Asynchronous processing
  • Data modeling and relational databases (PostgreSQL or similar)
• Solid experience with React or modern front‑end frameworks
• Experience building and maintaining product platforms over time
• Comfort learning new frameworks and technologies as needed (e.g., Medusa)
• Ability to balance technical quality with product delivery
• Strong communication and collaboration skills

1. Desired qualifications:

• Experience with Medusa JS or another headless commerce platform
• General e‑commerce knowledge:
  
  • Carts, checkout flows, promotions, inventory, PIM
• Payment, tax, or shipping integrations (Stripe, PayPal, custom gateways)
• TypeScript‑first codebases
• Redis, background jobs, or message queues
• Automated testing (Jest, Playwright, Mocha, Supertest)
• Docker‑based development or CI/CD pipelines

1. Soft Skills & Work Style:

• Excellent team player with ability to work independently and in time-sensitive environments.
• Motivated self-starter with exceptional communication and interpersonal skills.
• Must have experience working in a team production environment.
• Comfortable working in a fast-paced migration environment.
• Dependable, enthusiastic, motivated, team player, detail-oriented.
• Great communication skills.
• Ability to learn new tools quickly to get the job done.

1. Testing & Quality

• Working experience of testing tools like Playwright / Jest / Mocha / Supertest for Medusa JS.

1. Key Performance Indicators;