Frontend Developer

Senior Frontend Engineer

Freelance Contract

Hybrid 1 day per week onsite (Amsterdam)

€70 to €80 per hour

Overview

We’re supporting a global consumer platform undergoing major investment in its digital payments and checkout ecosystem. They are hiring a Senior Frontend Engineer to help shape and scale high traffic web applications used across multiple international markets.

This is a hands on senior role focused on performance, architecture, and customer critical user journeys rather than marketing sites or brochureware builds.

What you’ll be doing

• Building and scaling modern React and Next.js applications in production environments

• Driving frontend architecture decisions and engineering standards

• Improving performance across checkout and transaction heavy user journeys

• Implementing robust testing strategies using Jest and React Testing Library

• Collaborating with backend, DevOps, and product teams across the full delivery lifecycle

• Enhancing build tooling, CI pipelines, and developer experience

• Contributing to secure, resilient, and observable web platforms

Tech environment

• React, Next.js, TypeScript, JavaScript

• Redux or modern state management patterns

• Node.js and API integration layers

• GraphQL and REST services

• Jest, React Testing Library, Cypress

• CI CD, GitHub Actions, containerised deployments

• Modern CSS, Tailwind, component libraries

What they’re looking for

• Senior level experience building complex web applications

• Strong React and TypeScript production expertise

• Proven experience optimising frontend performance

• Solid testing culture and quality mindset

• Experience working on ecommerce, checkout, or payment platforms preferred

• Comfortable operating in high scale, customer facing environments

• Ability to own delivery from architecture through to production