Salary: £50,000 - 75,000 per year Requirements: Strong frontend fundamentals across HTML, CSS, JavaScript, and a modern framework, ideally React. A track record of shipping customer-facing products and being able to demonstrate their impact. Strong product instinct, with the ability to think beyond the brief and focus on what users actually need. Comfortable operating with limited direction in a fast-moving environment. Able to communicate technical trade-offs clearly to non-technical stakeholders. Someone who enjoys ownership, pace, and building from the ground up. 3-5 years building customer-facing software in a product-led or startup environment (nice to have). Experience with data visualisation libraries and presenting large, complex datasets clearly (nice to have). Exposure to Energy, FinTech Utilities, or another technically complex B2B sector (nice to have). Enough backend familiarity to read APIs, spot schema issues, and work effectively across the stack (nice to have). Experience setting up a frontend codebase from scratch (nice to have). Responsibilities: Design and build the interfaces through which customers view their energy data, including consumption, costs, billing, and asset performance. Take ownership of the frontend codebase, defining architecture, component structure, and engineering standards. Work closely with backend and data teams to create clean API integrations and iterate on UX based on customer feedback. Make pragmatic decisions that ship working software quickly, while keeping long-term maintainability in mind. Translate complex operational and commercial data into UI patterns that are easy to understand and act on. Surface the right information at the right time, prioritising clarity and usability. Build reporting and performance views that help customers understand their energy usage rather than simply display raw data. Set up the component library, testing approach, and development conventions that the team will build on. Help create an environment that is easy to onboard into as the team and product grow. Work closely with the founding team to prioritise effectively, balancing speed of delivery with durability. Embrace modern AI-powered programming tools and use them to maximise productivity and quality. Engage directly with customers and internal stakeholders to understand how the product is being used and where it can improve. Develop a working knowledge of energy supply and the UK energy system so interfaces reflect real customer needs. Identify usability issues proactively and solve them without needing heavy direction. Technologies: AI API Backend CSS Frontend JavaScript React UX UI Design More: We are a dynamic company looking for a Frontend Engineer to join our team in Mayfair, London, operating on a hybrid basis with ideally 3 days per week in the office. This role will allow you to make significant contributions to our customer platforms and the overall product direction. As our first dedicated frontend hire, youll play a crucial part in transforming complex energy data into user-friendly interfaces while collaborating closely with a small leadership team. We offer an opportunity to shape a product from its early stages, develop expertise in energy data, and grow with our expanding customer base. last updated 11 week of 2026