Senior Frontend Engineer

About THG

We are THG, a global ecommerce group on a mission to be the global online leader in beauty and sports nutrition.

Our portfolio of leading retailers and brands such as LOOKFANTASTIC, Myprotein, ESPA, Perricone MD, and Cult Beauty form our two core businesses: THG Beauty and THG Nutrition.

From Manchester to New York, we're powered by a team of over 2500 people who work together, lead by example, and think BIG.

With us, you'll go further, faster. What are you waiting for?

Location:

Icon 1, WA15 0AF

Technology is the driving force behind THG, and it starts with our people. We are ambitious with our goals and challenge conventional thinking. THG Technology is different because we support every single person to make massive impact and drive their own work. Our people are always learning, and we work every day to ensure our technology is world class. This enables us to keep powering THG on a global scale.

Working specifically in the e-commerce squads, you will be responsible for the end-to-end operation, development and management of the Beauty & Nutrition storefronts. This uniquely provides a key opportunity to influence c. 140 locales across 15 high profile brands, utilize the latest technologies, innovate and make empowered choices that help shape the future of the THG commerce.

We are seeking a highly skilled Senior Frontend Software Engineer to join our squads exclusively focused on building performant, secure, and accessible headless ecommerce frontends. You'll work predominantly in a JavaScript environment, leveraging modern technologies to deliver fast, scalable, and engaging customer experiences.

This role is ideal for a frontend specialist with strong technical depth, a keen eye for detail, and a passion for driving user-facing innovation within a complex ecommerce landscape.

• Help shape & define the technical architecture of the application, including the system's components, data structures, communication protocols, and other technical details
• Identify potential technical risks and develop strategies to mitigate them, ensuring that the application is secure, robust and reliable
• Champion performance optimisation across the frontend stack while ensuring accessibility and observability are baked into all solutions
• Deeply committed to crafting intuitive, impactful, and optimised user experiences that turn complex workflows into seamless, engaging journeys
• Share your knowledge within a democratic team of experts, to achieve optimal solutions
• Foster a culture that encourages the growth of a highly performant team
• Mentor junior developers and contribute to technical decision‑making within the squad

• Proven experience architecting, developing, and delivering scalable, high-performance frontend applications
• Expert in JavaScript (vanilla, ES6+, & modern frameworks)
• Experience of headless SSG applications and GraphQL
• Delivery of performant, maintainable, and reusable code that adheres to best practices and coding standards
• A solid understanding of events and event-driven programming, inheritance, throwing/catching errors, asynchronous vs synchronous programming
• Demonstrable experience implementing & managing end-to-end / unit / integration testing strategies across a team
• Strong leadership and coaching skills, able to manage the delivery of complex projects and features with team members

• Access bespoke development programmes that have been designed and developed by our in-house L&D team.
• Continued development through our upskilling programme that is delivered in partnership with an industry‑leading training provider.

• 25 days annual leave plus bank holidays.
• Don’t want to work on your birthday? We don’t either! Enjoy your day off on us!
• Enhanced maternity and paternity pay, depending on length of service.
• Up to 10 days compassionate leave.
• Buy back up to 3 days each year.
• Unlock 2 days volunteer leave after 12-months.

• Access face‑to‑face and virtual appointments with our in‑house GP.
• Access our in‑house CBT therapist.
• Access our 247…