Senior Frontend Engineer; Web & App

Our Company
At Quantum we connect global brands with high-intent consumers. We turn intent into action and complexity into clarity.

Our Mission is clear to help smarter faster buying decisions. Our vision to be the worlds most used digital comparison service delivering value and simplicity to millions.

We drive growth through data-driven affiliate marketing built for performance from day one. Every campaign is measurable optimised in real time and designed to scale.

With in-house tech full-stack analytics and a compliance-first mindset we give our partners an edge. We drive confident decisions and growth in regulated and high-growth sectors. Weve helped ambitious brands grow faster smarter and globally.

The Role

Our Rewards Tech team is growing! Were looking for a Senior Frontend Engineer to join our team in Maidstone.

In this role you will own the frontend across our Cashback and Custard apps and websites shipping new functionality that moves revenue hardening our release pipeline with automated testing and raising the bar on how our reward products look and feel.

Key Responsibilities

• Own the frontend across the Cashback and Custard apps and websites from build through to release

• Ship new app functionality that moves revenue and retention working closely with product and backend

• Build and maintain automated end-to-end tests so staging is stable and releases are predictable

• Raise the standard of web and app UX across both reward brands

• Work full stack where it counts partnering with our backend developers on the Python services behind the apps

About You

• A strong senior frontend engineer production-grade with React and Type Script on the web

• Minimum 6- 10 years experience.

• Hands-on experience building and shipping mobile apps ideally React Native across iOS and Android

• A sharp eye for UX and design you care how a product feels not just whether it works

• Comfortable owning end-to-end and staging test automation as part of how you ship

• Happy working across the stack with Python a strong plus rather than a hard requirement

• You do your best work as part of a team and enjoy sharing knowledge as much as gaining it

• Comfortable navigating a fast-paced environment

• Excellent written and verbal communication skills

• A genuine desire to learn grow and lift others around you

What Youll Get

• Private Health Care (Bupa)

• Hybrid Working (3 days in office)

• Travel Insurance

• Competitive Base Salary

• Company Bonus Scheme

• Paid for AI Subscription (Claude / ChatGPT / Gemini)

• Market-Leading Training Programme

• Recognition & Reward Scheme

• Annual Company Conference

• Regular Happy Hours & Team Lunches

• Free Coffee Drinks & Snacks

Whats the next step

Our hiring process ensures were recruiting the right people for the role. We ensure that people are as suitable for us as we are for them.

If you like the sound of what were all about at Quantum and want to join a team where you can make an impact please apply or contact us at

Required Experience:

Senior IC