Contract ETL andamp; Data Platform Specialist - NAV/Jet Contract | London/Hybrid | 3-6 months The Opportunity A well-known UK membership organisation is seeking an experienced Contract ETL andamp; Data Platform Specialist with strong, hands-on expertise in the Jet Analytics ecosystem and SQL Server for a focused, short-term remediation engagement. You will take ownership of a non-performant ETL and data platform environment - diagnosing the issues, implementing the fixes, and leaving behind a streamlined, performant, and well-documented data platform with clear knowledge transfer to the internal team. You will be working alongside a parallel Reporting Specialist engagement, so collaboration and alignment on shared data requirements is an important part of the role. What You''ll Be Doing Assess and remediate an existing non-performant ETL setup - identifying root causes of performance, reliability, and data completeness issues across the NAV-to-Jet Data Warehouse pipeline Review and optimise the Jet ETL, warehouse, and physical database design on SQL Server - recommending and implementing changes for efficiency, scalability, and resilience Review and optimise the Jet Finance cube design and refresh processing (Jet Data Warehouse to SSAS Tabular) - improving performance and reliability of cube refresh cycles Coordinate scheduling across ETL and cube processes with the internal Platforms team to avoid conflicts with patching and backup windows Deliver monitoring scripts and al