Senior Full Stack Software Engineer in London

Senior Full Stack Engineer85,000 to 105,000PermanentRemote, with occasional London office visitsThe opportunityOur client is hiring a Senior Full Stack Engineer to take ownership of building the next generation of customer-facing software in the energy market.The business operates in a complex, high-value sector and is using technology, data, and strong product thinking to modernise an industry that has historically been underserved by great software.We have already recruited 4 people into the business, and all 4 are still there. We know the company and team well and are pleased to be supporting them again on this important hire.This is a genuinely high-impact opportunity for an experienced engineer who is equally comfortable across frontend and backend development. You will take the lead on building new products and developing the codebase, with significant autonomy over technical decisions, architecture, and delivery.The position can be fully remote, although the business would welcome occasional visits to its Mayfair office for collaboration and team time.The roleThis is a true full stack position.They need someone strong in React and TypeScript who can build polished, reliable customer-facing software, but who is equally capable of contributing across backend services, APIs, application logic, databases, and data-rich workflows.The platform supports complex energy processes across areas such as billing, metering, consumption, reporting, and asset performance. You will be responsible for taking those workflows and turning them into clear, scalable products that customers genuinely value.Initially, you will lead much of the engineering work independently. You will not, however, be expected to operate without support. The business can provide access to external engineering expertise and additional coding support where needed as the platform and codebase develop.This role offers genuine autonomy. You will have the freedom to make sensible technical decisions, shape engineering standards, and influence how the product evolves as the company grows.What you will be doingLeading the development of customer-facing products from initial concept through to productionBuilding modern frontend applications using React and TypeScriptDesigning and developing backend services, APIs, integrations, and application logicWorking with Python, SQL, databases, and data platformsTaking ownership of architecture, technical decisions, and engineering standardsTurning complex energy and operational data into clear, intuitive product experiencesWorking closely with product, data, leadership, and external engineering partnersBuilding a scalable and maintainable codebase from the ground upHelping define the future engineering team and technical direction as the business expandsWhat they are looking forStrong commercial experience across both frontend and backend engineeringExcellent React and TypeScript capabilityStrong backend development experience, ideally including PythonGood experience with APIs, databases, SQL, and system integrationsA track record of leading projects or taking ownership of major technical workstreamsExperience building customer-facing software from scratchStrong product instincts and the ability to think beyond individual ticketsConfidence making technical decisions and working with a high level of autonomyExcellent communication skills and the ability to work closely with technical and non-technical stakeholdersPersonality and attitude are particularly important. They want someone positive, proactive, collaborative, and genuinely enthusiastic about building great software. The right person will bring energy to the team, take responsibility, and approach challenges with a practical and constructive mindset.Nice to haveStartup or scale-up experienceEnergy, utilities, trading, sustainability, or fintech experienceData visualisation experienceExperience working with Databricks or similar data platformsExperience using AI-assisted development toolsPrevious involvement in shaping engineering teams, standards, or architectureWhy joinA salary of 85,000 to 105,000 + BonusThe flexibility to work remotelyOccasional collaboration from the Mayfair officeReal autonomy over what gets built and how it is deliveredThe opportunity to lead a major product and codebase from an early stageDirect influence over product and technical directionSupport from external engineering resources when requiredBroad exposure across frontend, backend, data, architecture, and productLong-term scope to help build and shape the engineering functionA growing business operating in a complex and important energy marketSummaryThis is an excellent opportunity for a Senior Full Stack Engineer who wants meaningful ownership rather than simply maintaining an established platform.You will lead the development of customer-facing software, work across React, TypeScript, Python, APIs, databases, and data-rich systems, and have the autonomy to shape the technical direction of a growing energy business.They are looking for someone technically strong, but equally importantly, someone with an excellent attitude who is positive, engaging, and excited by the opportunity to build.Salary/Rate:85,000 - 105,000Job type:PermanentLocality:RemoteRegion:Remote