Senior Shopify Developer (Contract Role)

Senior Shopify Developer

At Horizontal Digital, we hold ourselves to one key belief: You’re only as good as your worst customer experience. This manta is what drives our digital consultancy to think beyond the easy answers and instead create websites, apps, portals and other experiences that solve customer needs for Fortune 500 companies in intuitive and empathetic ways. And we make this lofty standard a reality by fusing strategy, data, design and technology together to arrive at solutions that set the bar higher for everyone.

We use these values to fuel superior results:

Never settle

But enough let's talk about you.

As a Senior Shopify Developer in our Commerce Practice, you build and integrate the commerce experiences that sit at the heart of our clients' digital platforms — from solution design and development through QA and release. Your measure of success is simple: raving-fan clients, reliable storefronts and on-time, on-budget delivery.

We're looking for a hands-on engineer who has shipped Shopify and Shopify Plus solutions alongside enterprise CMS and DXP platforms such as Sitecore, Contentstack and Optimizely. You'll work within a blended team of front-end and back-end developers, partner closely with the Technology Lead, project management, strategy and UX/creative, and bring a pragmatic, AI-assisted approach to how we design, build and deliver.

What You'll Do

Commerce Development & Integration

• Build Shopify storefronts: develop and customize Shopify and Shopify Plus stores, including Online Store 2.0 themes, Liquid templates, sections and blocks, metafields/metaobjects and checkout extensibility.
• Deliver headless or non headless commerce: build headless storefronts using the Storefront API with Hydrogen or Next.js, hosted on Oxygen, Vercel or Netlify, with sound rendering and caching strategies (SSG/ISR/SSR). Develop Shopify experience using Liquid as well.
• Integrate Shopify with CMS and DXP platforms: connect Shopify to Sitecore (including SitecoreAI / XM Cloud), Contentstack and Optimizely so that content and commerce work as one experience — product data in content pages, shoppable content, shared component libraries and unified search.
• Build custom apps and extensions: develop Shopify apps, Functions, checkout and customer account UI extensions, and Flow automations using the Admin GraphQL API, webhooks and Shopify CLI.
• Connect the back office: integrate Shopify with ERP, PIM, OMS, CRM, payment, tax, search and marketing platforms through APIs, middleware and event-driven patterns.
• Contribute to solution design: support technical discovery, help define data models (products, variants, markets, pricing, catalogs), and provide input on estimates, technical specifications and risks.
• Build with quality: write clean, tested, well-documented code, participate in code reviews, and ensure solutions meet performance (Core Web Vitals), accessibility (WCAG), SEO and security standards.
• Support QA and release: partner with QA on test plans and UAT, triage and resolve defects, and support deployments, store migrations and production releases.

Team & Collaboration

• Partner across disciplines: work closely with the Technology Lead, Project Manager, UX/creative and client teams to translate business goals and designs into working commerce features.
• Share knowledge: mentor junior developers, contribute to code reviews and help raise the team’s Shopify and integration expertise.
• Champion AI-assisted engineering: use AI development tools (e.g., GitHub Copilot, Cursor, Claude Code) responsibly to improve velocity and quality.

Practice & Growth

• Support business development: contribute technical input to commerce proposals, estimates and solution demos as requested.
• Strengthen the practice: contribute to internal standards, accelerators, reusable Shopify components and integration patterns, and stay current on Shopify, headless commerce and AI trends.

What You Bring

• 5+ years of hands-on Shopify development experience, including Shopify Plus implementations for mid-market or enterprise brands.
• Proven experience integrating Shopify with CMS/DXP platforms: at least one of Sitecore, Contentstack or Optimizely, in headless or composable architectures.
• Strong command of Liquid, Online Store 2.0 theme architecture, Shopify CLI and theme/app development workflows.
• Hands-on experience with Shopify APIs (Storefront API, Admin GraphQL and REST), webhooks, Shopify Functions and checkout extensibility.
• Strong JavaScript/TypeScript, React and Next.js skills; Hydrogen/Remix experience strongly preferred.
• Experience with REST/GraphQL API integration, middleware and serverless/edge functions on platforms such as Vercel, Netlify or Oxygen.
• Working knowledge of Git-based workflows, CI/CD and Agile/Scrum delivery, including estimation and sprint planning.
• Solid grounding in accessibility, SEO, web performance and security best practices for commerce sites.
• Excellent communication skills, with the ability to explain technical trade-offs to non-technical stakeholders.
• Bachelor's degree in Computer Science, Computer Engineering or a related field, or equivalent experience.

Bonus Points For

• Practical use of AI-based development tools (GitHub Copilot, Cursor, Claude Code or similar) and familiarity with Shopify’s AI capabilities (e.g., Shopify Magic / Sidekick).
• Experience with the broader composable stack: Sitecore Search, Contentstack Personalize, Optimizely Experimentation/Personalization, Algolia or similar search and personalization tools.
• Replatforming experience migrating stores to Shopify from Salesforce Commerce Cloud, Adobe Commerce (Magento), Optimizely Commerce or similar.
• Experience with Shopify Markets, B2B on Shopify and multi-store / international setups.
• Shopify Partner certifications and/or Sitecore, Contentstack, Optimizely or Vercel certifications.
• Agency or consulting experience.