Senior Frontend Engineer (Web & App)

Quantum; Loose; On-site; GBP 70,000 - 95,000; Full time

Benefits offered by this job

Private Health Care (Bupa)

Hybrid Working (3 days in office)

Travel Insurance

Company Bonus Scheme

AI Subscription (Claude / ChatGPT /Gem

Market-Leading Training Programme

Recognition & Reward Scheme

Annual Company Conference

Regular Happy Hours & Team Lunches

Free Coffee, Drinks & Snacks

Job summary

Quantum is seeking a Senior Frontend Engineer to own the frontend across our Cashback and Custard apps and websites, delivering new functionality that drives revenue and retention. You will collaborate with product and backend teams, and lead end-to-end test automation to ensure stable releases.

You should have strong React and TypeScript skills for web, plus hands-on React Native experience for mobile apps.

Qualifications

• Senior frontend engineer with React and TypeScript on the web.
• Experience shipping mobile apps with React Native (iOS/Android).
• Strong UX focus and product feel.
• End-to-end test automation ownership.
• Comfortable with Python as a plus.
• Team player who shares knowledge and learns from others.
• Able to thrive in a fast-paced environment.
• Excellent written and verbal communication.

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.

Skills

React

TypeScript

React Native

UX design

Test automation

Python knowledge

Team collaboration

Tools

Python

Job description

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 TypeScript on the web
• 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 You'll 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

What's the next step? Our hiring process ensures we're recruiting the right people for the role. We ensure that people are as suitable for us as we are for them. #J-18808-Ljbffr

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 world's 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. We've helped ambitious brands grow faster, smarter, and globally.

The Role

Our Rewards Tech team is growing! We're 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