Senior Front-End Developer

Job Title: Senior Front-End Developer
Department: Digital
Location: UK (Hybrid)

Role Overview

We are looking for a Senior Front-End Developer to join a Digital team, playing a key role in the ongoing development and evolution of multiple digital platforms.

You will take ownership of in-house front-end implementation across a primary ecommerce website, a secondary content-led site, and supporting digital touchpoints such as email and experimentation platforms. Working closely with Product, Design, external delivery partners, and senior technology stakeholders, you will help shape high-quality, performant, and accessible user experiences that support both brand and commercial objectives.

While the primary focus is web-based, future initiatives may include native or hybrid app experiences. Experience working across multiple platforms, or contributing to app-adjacent front-end architecture, would be advantageous.

This role is well suited to an experienced front-end engineer who enjoys setting standards, making architectural decisions, and collaborating closely across disciplines.

Key Responsibilities

• Lead front-end development across multiple web platforms, ensuring high standards of quality, performance, accessibility, and maintainability

• Translate design systems, wireframes, and high-fidelity designs into robust, scalable, and accessible front-end solutions

• Own and influence front-end architectural decisions, balancing long-term maintainability with delivery requirements

• Partner with Product and Design teams early in discovery and planning to shape technical approaches

• Design, build, and deploy complex A/B and multivariate experiments using experimentation platforms, collaborating with analytics and optimisation teams

• Support HTML email development, ensuring consistency, accessibility, and responsiveness across devices and clients

• Champion front-end best practices, including performance optimisation, accessibility standards, and cross-browser compatibility

• Conduct thorough QA and code reviews to identify issues early and ensure high-quality releases

• Act as a senior technical voice within the team, sharing knowledge, mentoring where appropriate, and raising overall engineering standards

Candidate Requirements

Essential

• Significant experience as a Front-End Developer, including time in senior or lead-level roles within ecommerce, digital retail, or complex content-driven environments

• Proven experience leading or influencing front-end architecture and technical decisions across large-scale websites or platforms

• Strong expertise in HTML5, CSS, and JavaScript, with deep knowledge of responsive design, performance optimisation, and accessibility best practices

• Experience designing, implementing, and evaluating A/B or multivariate experiments using modern experimentation tools

• Confidence collaborating cross-functionally with Product Managers, Designers, Analysts, and Engineering peers

• Strong problem-solving skills, attention to detail, and the ability to balance technical quality with delivery timelines

Desirable

• Experience working with enterprise ecommerce platforms and/or content management systems

• Familiarity with templating frameworks and front-end tooling such as Handlebars.js, PHP, or CSS frameworks

• Exposure to app-related front-end development or shared web/app architectural patterns

• Experience working in brand-led, design-focused, or premium ecommerce environments

Practicalities

• Full-time role with a standard working week

• Hybrid working model, combining home-based and office-based work

• Opportunity to join a collaborative digital team operating at the intersection of established brand values and modern technology

Sphere is an equal opportunities employer. We encourage applications regardless of ethnic origin, race, religious beliefs, age, disability, gender or sexual orientation, and any other protected status as required by applicable law.

If you require any adjustments or additional support during the recruitment process for any reason whatsoever, please let us know.