Shopify App Developer

Shopify App Developer
Location: Remote in UK
Duration: ~3 months (Project-Based Contract - potential for renewal)
Rate: £450 - £550 per day Outside IR35

Overview
We're looking for an experienced Shopify App Developer to support a 3-month project focused on expanding an existing Shopify app used by publishers to sell publications via their storefronts.
The app is already in production, and the goal is to enhance functionality, extend integrations, and improve fulfilment workflows. This role requires someone who can quickly get up to speed with an existing codebase and deliver high-quality improvements with minimal ramp-up time.

Key Responsibilities
Enhance and extend an existing Shopify app
Build new features using Shopify GraphQL APIs
Implement and optimise Shopify Fulfilment API integrations (critical)

• Develop Back End services in Java (Spring Boot)
• Ensure stable and scalable integration between Shopify and internal systems
• Debug and resolve issues across order, fulfilment, and inventory flows
• Work closely with the team to deliver project milestones within the contract period

Required Skills & Experience
Strong, hands-on experience building Shopify apps
Deep understanding of Shopify GraphQL API
Proven experience with the Shopify Fulfilment API (essential)

• Solid Back End experience with Java and Spring Boot
• Experience with Shopify webhooks, authentication, and app life cycle
• Ability to quickly understand and work within an existing system
• Comfortable delivering in a fast-paced, project-driven environment

Desirable

• Experience with publishing, print, or similar product-based workflows
• Familiarity with Shopify Embedded apps or admin extensions
• Experience improving or scaling production Shopify apps

Engagement Style

• Project-focused delivery over a ~3 month period
• Expected to be largely self-sufficient
• Able to ramp up quickly and contribute from the outset
• Clear communicator with regular progress updates