Senior Fullstack Developer (NodeJS, TypeScript)

In this role, you will

• Lead the design and development of a multi-market storefront in Next.js and TypeScript, covering catalog, product pages, cart and checkout flows.

• Choose and justify the right rendering strategy per surface (static, incremental, server-rendered, client-side) based on traffic patterns and freshness needs.

• Design the caching layer end to end, from CDN and edge through to browser, including invalidation when product, price or inventory data changes.

• Own the performance budget and optimise across regions, from bundle size and hydration cost through to time to first byte.

• Build and maintain the orchestration layer between the storefront and commerce services using Node.js with REST or GraphQL.

• Handle multi-currency and multilingual storefront experiences so each market gets the right catalog, language and pricing.

• Implement and iterate on payment and checkout flows, working with gateways such as Stripe, PayPal, Klarna, Apple Pay and Google Pay.

• Support A/B testing and analytics tracking so product decisions are backed by data.

• Guarantee test coverage with unit, integration and end-to-end testing, and keep CI/CD pipelines healthy.

• Support observability and operational excellence with proper logging, monitoring and rollback procedures, leveraging AWS where applicable.

• Guide and mentor mid-level engineers, and share context with both the Gradion team and the client's engineers.

• Experiment with AI developer tools (Cursor, Claude, Copilot).

What you will bring

• 5+ years of engineering experience on production web applications at scale.

• Strong command of TypeScript, React and Next.js, plus deep JavaScript and browser fundamentals.

• Backend experience with Node.js and REST or GraphQL APIs, including designing the orchestration layer between storefront and commerce services.

• Solid understanding of rendering and caching strategies, and the ability to reason about the trade-offs between them.

• Hands-on experience deploying to a CDN or edge platform such as Cloudflare, Vercel or CloudFront.

• Working exposure to AWS (Lambda, S3 or similar services), enough to reason about how your application is deployed and run.

• Experience with automated testing and CI/CD pipelines.

• Good spoken and written English. You will be in daily technical discussion with European engineers, including live architecture and pairing sessions.

• Willingness to learn the Shopify ecosystem, even if you have not used it before.