6 month contract£712/day via Umbrella3 days per week in the office - Non negotiableSENIOR DATA ENGINEER Contract | Inside IR35 | Up to £712/day (Umbrella) City of London | Prestigious Financial Services Client My client sits at the centre of global markets, processing trillions of dollars in transaction value annually and providing reference prices relied upon by the worldwide financial community. This is a genuinely high-impact contract opportunity. You will be joining the Enterprise Data team at a pivotal moment - leading the replacement of a Legacy ETL platform (Informatica) with a modern, scalable data engineering architecture. If you are passionate about engineering excellence and want to leave a tangible footprint on a market-leading organisations data infrastructure, this role is worth a serious look. What You Will Be Doing Designing, building, and maintaining production-grade data pipelines and infrastructure across data warehouses, with a focus on reliability and scalability. Ensuring data quality and integrity across workloads using Python, Java, or Scala, with robust automated validation, monitoring, and testing. Developing and managing data lake and data warehouse architectures, including data cleansing, transformation, and governance processes. Leading root cause investigations for data incidents and delivering improvements to system stability and performance. Evaluating and recommending technical solutions - including prototypes, technical spikes, and proofs o