Senior Fullstack Engineer

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Senior Fullstack Engineer in Others

GRADION
Full time
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Others
09/19/2026
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Hanoi, Vietnam

Responsibilities

Lead the design and development of a multi-market storefront using Next.js and TypeScript.
Choose rendering strategies and design end-to-end caching across CDN, edge, and browser layers.
Own performance optimization across bundle size, hydration cost, and time to first byte in multiple regions.
Build and maintain Node.js orchestration services using REST or GraphQL between the storefront and commerce services.
Implement multilingual, multi-currency catalog and pricing experiences.
Develop payment and checkout flows using gateways such as Stripe, PayPal, Klarna, Apple Pay, and Google Pay.
Support A/B testing and analytics tracking, automated testing, CI/CD, observability, monitoring, and rollback procedures.
Mentor mid-level engineers and collaborate with Gradion and client engineering teams on architecture and implementation.
Experiment with AI developer tools including Cursor, Claude, and Copilot.

Requirements

5+ years of engineering experience building production web applications at scale, with recent experience weighted toward frontend work.
Strong command of TypeScript, React, Next.js, JavaScript, and browser fundamentals.
Backend experience with Node.js and REST or GraphQL APIs, including storefront and commerce-service orchestration.
Strong understanding of rendering and caching strategies and their trade-offs.
Hands-on experience deploying to a CDN or edge platform such as Cloudflare, Vercel, or CloudFront.
Working exposure to AWS services such as Lambda and S3.
Experience with automated testing and CI/CD pipelines.
Good spoken and written English for daily technical discussions, architecture sessions, and pairing with European engineers.
Willingness to learn the Shopify ecosystem.
Preferred qualifications include Shopify headless development with Storefront API, Functions, or Checkout UI Extensions; e-commerce or conversion-focused product experience; subscription or recurring purchase experience; Playwright or Cypress; analytics tools; and headless CMS platforms.

Benefits

Performance bonus of up to 2 months’ salary.
Performance reviews twice a year.
Premium healthcare and an annual health check.
15 days of annual leave and full salary during probation.
Hybrid working arrangement.
Monthly Happy Hour and community technology activities.
Global projects, innovation-team participation, and diverse training programs.
Monday–Friday working schedule from 9 AM to 6 PM at the Ho Chi Minh City office.

GRADION

Gradion is a privately held IT services firm that designs and builds digital platforms and deep-tech solutions—AI, data engineering, cybersecurity, and robotics—for e-commerce, retail, travel/mobility, and logistics. It provides consulting and software engineering through project-based and manage...

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