Senior SQL Developer

OverviewInsight Global is seeking a Senior SQL Developer to join the Index Delivery & Product team within a leading global financial markets organisation. This role sits within the Index Migration team and will focus on migrating index configurations, index calculation logic, and historical index data from legacy platforms onto the firm's strategic index management platform.This is a highly data-focused role where the majority of your time will be spent analysing existing index structures, investigating data models, understanding calculation methodologies, and determining how index configurations and historical data should be mapped between systems. While exposure to .NET applications and UI-based platforms is beneficial, this is fundamentally a database engineering and data migration position rather than a traditional software development role.The successful candidate will combine strong SQL development skills with exceptional analytical thinking, ownership, and problem-solving abilities. You will be trusted to drive migrations independently, make informed technical decisions, validate the accuracy of migrated data, and ensure the quality and integrity of business-critical index information.This is an AI-first engineering environment where developers are encouraged to leverage AI tools responsibly to improve productivity, accelerate analysis, and support delivery, whilst maintaining full accountability for the quality, accuracy, and outcome of their work.Day-to-DayAs a SQL Developer within the Index Migration team, you will be responsible for analysing existing index configurations, historical index data, and legacy platform structures to determine the most effective migration approach into LSEG's strategic platforms. You will work extensively with Microsoft SQL Server and Sybase databases, investigating complex data models, understanding how index calculations are performed, mapping data between differing systems, and validating historical index records. You will develop and optimise SQL solutions, perform large-scale data analysis, reconcile migrated data, and troubleshoot migration challenges throughout the lifecycle of each project. Working closely with business SMEs, product teams, and engineers, you will take ownership of individual migrations from discovery through completion, ensuring data quality, accuracy, and consistency at every stage.Must Haves5+ years of SQL Development experienceStrong SQL development experience working with Microsoft SQL Server, T-SQL development skills etcExperience working with Sybase databasesProven experience analysing and working with large datasetsExperience supporting data migration, platform migration, or transformation projectsExperience investigating existing systems and determining migration approachesExperience mapping and transforming data between different data modelsAbility to independently investigate complex technical and business problemsExperience working with business stakeholders to understand requirements and data relationshipsExperience using AI tools as part of the software development or data analysis lifecycleFinancial Services, Capital Markets, or Index Management experiencePlussesExperience working with Equity Indices or Index Calculation methodologiesPrevious experience migrating historical datasets between platformsUnderstanding of index configurations and index lifecycle managementExposure to C#/.NET applicationsExposure to UI-based applications that sit alongside database platformsExperience with legacy platform modernisation initiativesExperience working with PostgreSQL or MySQLExperience analysing and reconciling historical data spanning multiple yearsExperience leveraging AI tools to improve analysis, validation, or engineering productivity