Application Support (.Net/SQL) Hybrid/Marlow 3 days per week on site Up to 50KOur client provides enterprise-grade Field Service Management (FSM) platform, serving multi-vertical service operations across fire security, facilities management, HVAC, medical devices, and MoD/defence supply chain customers in the UK, Ireland, and internationally. About the RoleTheir platform comprises three core applications: built on a .NET/VB.NET/C# stack with SQL Server, deployed across both Azure-hosted and on-premise (Windows Server) customer environments. You''ll work shoulder-to-shoulder with the engineering team - confirming genuine defects, providing detailed technical reproduction steps, and occasionally contributing fixes yourself for well-understood issues. This is a hands-on technical role for someone who enjoys getting into the guts of a complex enterprise application.What You''ll Be Doing: Own escalated tickets from 1st line support requiring deeper technical investigation Write and run SQL Server queries against production and test databases to investigate data integrity issues, configuration problems, and reported bugs. Read and step through VB.NET/C#/.NET Framework and .NET codebase to understand root cause, distinguishing genuine defects from configuration or user error. Reproduce complex, intermittent, or environment-specific issues across ASP.NET WebForms, MVC, and newer Vue.js/SPA application. Troubleshoot SOAP and REST API integration issues raised by customers connecting