Senior Full Stack Developer (Next.js, Node.js, AWS)

About the role

ABOUT US:

At Gradion, we are the strategic partner for ambitious businesses, helping them achieve breakthrough growth through Digital Innovation and Deep Tech.

With a global vision and an AI-first approach, we enable clients to reshape strategies, optimize systems, and adopt cutting-edge technologies to create sustainable value.

From AI and data to cybersecurity, robotics, and large-scale enterprise platforms, Gradion designs practical solutions that lay the foundation for the next generation of billion-dollar companies.

OUR FACTS & FIGURES:

- 23+ years of expertise - Gradion builds digital platforms & deep-tech solutions.

- 3 continents: Asia, Europe and Africa.

- 300+ specialists across 7 countries Vietnam, Singapore, Thailand, Saudi Arabia, Germany, Egypt and Australia.

- 100+ enterprise clients, including several unicorns (e.g., Alaiko, HomeToGo, Roadsurfer).

- Vietnam’s Best IT Company - recognized by ITViec for 8 consecutive years, including 2 consecutive years of ranking #1 (2024 and 2025).

- ISO 27001.

About the role: You will own the frontend of a high-traffic headless storefront and the Node.js services behind it, serving customers across Europe, Latin America and APAC. Page speed here is not a nice-to-have, it maps directly to conversion, so your work centres on rendering strategy, caching and delivery at the edge. You will work day to day with the client's engineering team in Europe, contributing to architecture decisions rather than just implementing tickets.

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.

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

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

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

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

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

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

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

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