Senior Fullstack Developer (NodeJS, TypeScript)

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.

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.