Senior Full Stack Engineer

Quantum

London, England, United Kingdom permanent

Posted: March 20, 2026

Required Skills

Job Description

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 Technology team is growing! We’re looking for a Senior Full Stack Engineer to support the continued development and scaling of our platform as the business evolves.

In this role, you’ll work across both front-end and back-end systems, contributing to high-quality development and delivering technical solutions across the product lifecycle. Alongside coding and architecture, you’ll collaborate with and support other engineers, contribute to technical decisions, and help promote best practices across the team.

You’ll play a key role as a hands-on engineer and technical contributor, working closely with cross-functional teams to build scalable, efficient, and reliable applications using modern frameworks and tools.

Key Responsibilities

• Contribute as a hands-on engineer across both front-end and back-end codebases

• Help shape architecture and system design, with a focus on scalability, security, and performance

• Support and mentor other engineers through collaboration, code reviews, and knowledge sharing

• Design and build responsive, user-friendly web interfaces using modern JavaScript frameworks (Next.js, React)

• Collaborate with UX/UI designers to create intuitive and accessible user experiences

About You

• Strong experience with JavaScript frameworks such as React, Vue.js, or Angular

• Experience working with Node.js, Express.js, and building RESTful APIs or microservices

• Familiarity with SQL (PostgreSQL, MySQL) and/or NoSQL (MongoDB) databases

• Experience with CI/CD pipelines (e.g., Jenkins, CircleCI, GitLab CI) and containerisation tools like Docker

• Knowledge of CMS platforms is a plus

• Enjoy working collaboratively as part of a team

What You’ll Get

• Competitive Base Salary

• Company Bonus Scheme

• Hybrid Working (3 days in office)

• Private Health Care (Bupa)

• Travel Insurance

• Market Leading Training Programme

• Recognition & Reward Scheme

• Annual Company Conference (previous destinations Vienna, Bologna, Dubrovnik and Thessaloniki)

• Regular Happy Hour / 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.

If you like the sound of what we're all about at Quantum and want to join a team where you can make an impact, please apply or contact us at [email protected].

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