Senior Frontend Engineer – THG Join THG, a global ecommerce leader building beauty and nutrition brands, as a Senior Frontend Engineer. You will lead architectural decisions, mentor the squad, and deliver performant, secure, and accessible headless ecommerce frontends. About THG THG operates two core businesses: THG Beauty and THG Nutrition. With over 2,500 people worldwide, our mission is to be the global online leader in beauty and sports nutrition. Key Responsibilities

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.

Required Skills & Experience

Proven experience architecting, developing, and delivering scalable, high‑performance frontend applications. Expertise in JavaScript (vanilla, ES6+, & modern frameworks). Experience with 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.

Benefits

25 days annual leave + bank holidays. 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 to face‑to‑face and virtual appointments with an in‑house GP. Access to an in‑house CBT therapist. Access to a 247 Employee Assistance Programme (EAP) provided by Bupa. State‑of‑the‑art on‑site gym. On‑site physio. Up to 50% staff discount on THG brands. On‑site staff shop. Access to an on‑site barber. Refer a friend reward of up to £1,000 when they pass probation. Anniversary gifts when you hit 5 and 10 years of service.

Employment Details Mid‑Senior level, Full‑time, Engineering and Information Technology, based in Manchester, United Kingdom. Equal Opportunity THG is proud to be a Disability Confident and Committed employer. If you are invited to interview, please let us know if there are any reasonable adjustments we can make to the recruitment process that will enable you to perform to the best of your ability. THG is committed to creating a diverse & inclusive environment and welcomes applications from all sections of the community. #J-18808-Ljbffr