Senior Frontend Engineer (Web & App)
The Rewards Tech team is growing and is looking for a Senior Frontend Engineer to join the team in Maidstone. In this role, the engineer will own the frontend across the Cashback and Custard apps and websites, shipping new functionality that moves revenue, hardening the release pipeline with automated testing, and raising the bar on how the reward products look and feel.
The role requires working full stack where it counts, partnering with backend developers on the Python services behind the apps.
- 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.
- Strong senior frontend engineer, production-grade with React and TypeScript on the web (required).
- Hands-on building and shipping mobile apps, ideally React Native across iOS and Android (required).
- A sharp eye for UX and design: you care how a product feels, not just whether it works (required).
- Comfortable owning end-to-end and staging test automation as part of how you ship (required).
- Happy working across the stack, with Python a strong plus rather than a hard requirement (preferred).
- Thrives when working as part of a team (required).
- Comfortable in a fast-paced environment (required).
- Excellent written and verbal English skills (required).
- No ego (required).
- 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
Quantum is a performance-driven affiliate marketing and digital comparison company that connects global brands with high-intent consumers. Headquartered in London, it builds data-driven comparison services and campaigns designed to be measurable, optimised in real time and scalable. The company combines in-house technology, full-stack analytics and a compliance-first approach to operate in regulated and high-growth sectors. Quantum aims to help users make faster, smarter buying decisions while driving growth for its partners.