Principal Full Stack Engineer

Role Description

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.

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.

Qualifications

• 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.

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.

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.

Testing & Quality

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

Key Performance Indicators