Staff Data Engineer

We Are Sparta Sparta is the AI leader for commodity trading, home to Leonidas AI, the first operating system for oil and commodity traders. Backed by $42 million in Series B funding led by One Peak, with participation from returning investors FirstMark and Singular, the same investors behind AI leaders like Legora, Dataiku, and Synthesia. Most companies are building a chatbot on top of data. We've built an agent with an actual reasoning layer, grounded in years of proprietary market data and in-house trading expertise nobody else has. We're scaling fast, and it's an exciting time to join. From independents to multinationals, the world's leading commodity teams use Sparta and Leonidas AI to move faster, trade smarter, and stay ahead of the market. At Sparta, you'll be trusted to take ownership, backed by a team who wants you to succeed. AI is how we build here, not just what we sell. Good ideas move fast, and yours could go from staging to production in a couple of hours, whatever department you're in. You'll be challenged, supported, and given room to grow, building the AI that's changing how commodity trading gets done. Your work has reach. From shaping Leonidas AI, to powering smarter decisions for traders around the world, to changing how commodity trading is done. And because we're growing fast, you'll accelerate your career with a level of ownership and impact you simply won't get at bigger, slower-moving companies. Staff Data Engineer At Sparta, we're on a mission to build the next generation of commodity trading platforms - replacing the fragmented tools traders depend on with a single, powerful dashboard. Our product is a data-driven platform that aggregates real-time feeds from across the commodities domain, transforming them into intuitive, actionable visualisations within one unified interface. Users can explore pre-built data views or build their own custom formulas - turning raw market data into decisions. At the heart of Sparta is a serious data engineering challenge. We're building a platform that enables the rapid development of reliable, scalable ETL pipelines - the foundation everything else depends on. As our data volumes grow and our product ambitions expand, the demands on that infrastructure grow with them. We're looking for experienced data engineers who are familiar with these challenges at scale — people who understand what it takes to keep a data platform performing as complexity increases. We want people who thrive with ownership. At Sparta, you'll be handed problems, not solutions - and we expect you to run with them. Speed matters, autonomy is real, and we'd rather you move fast and course-correct than wait for permission. As a Staff engineer, you'll also be shaping the direction of the platform itself: engaging directly with stakeholders, contributing to product thinking, and investing meaningfully in the engineers around you. This role can be based in the UK (London) or Spain (Barcelona, Madrid), and we would expect to spend some time together with the team in-office (2 -3 days a week). CORE RESPONSIBILITIES - Play a leading role in the design, build, and ongoing evolution of scalable data pipelines and ETL frameworks that power both real-time and analytical data processing. - Take shared ownership of the health and performance of our data platform - optimising for latency, throughput, and reliability at scale. - Collaborate closely with engineering and cross-functional stakeholders to ensure data infrastructure aligns with product goals and trader-facing outcomes - acting as the connective tissue between data and backend engineering. - Drive architectural decisions across our data platform, with a focus on pipeline reliability, data quality, and scalability. - Contribute t