Application Support Engineer

• Own escalated tickets from 1st line support that require deeper technical investigation across Service Centre, REA, and RCA.
• 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 our VB.NET, C#, .NET Framework, and .NET codebase to understand root cause and distinguish genuine defects from configuration or user error.
• Reproduce complex, intermittent, or environment-specific issues across ASP.NET WebForms, MVC, and newer Vue.js/SPA components of the application.
• Troubleshoot SOAP and REST API integration issues raised by customers connecting third-party or ERP systems to our platform.
• Investigate issues at the infrastructure level across Windows Server, IIS, and SQL Server configuration in both Azure-hosted and on-premise customer environments.
• Monitor and respond to production alerts via Site24x7, carrying out first-level infrastructure diagnostics ahead of escalation to platform and engineering teams.
• Log well-evidenced defects into Jira with clear reproduction steps, logs, and impact assessment, and track them through to resolution and release.

• Proven experience in a 2nd line, technical support, or application support role, ideally supporting a complex B2B or enterprise software product.
• Strong working knowledge of SQL Server, including confidence writing non-trivial queries with joins and aggregations to investigate data and configuration issues.
• Ability to read and reason about C# and/or VB.NET code to identify root cause, even without day-to-day development responsibility.
• Practical understanding of ASP.NET applications, including WebForms and/or MVC, and how they are deployed under IIS.
• Comfortable working with Windows Server environments and troubleshooting application, IIS, and OS-level issues.
• Experience with API troubleshooting, including inspecting SOAP or REST requests and responses to isolate integration issues.
• Strong analytical and diagnostic skills, with the ability to work methodically from symptom to root cause on ambiguous or intermittent issues.
• Excellent communication skills, with the ability to explain technical findings to both customers and engineers., * .NET Framework
• API
• ASP.NET
• Azure
• C#
• ERP
• Support
• JIRA
• MVC
• PaaS
• REST
• SOAP
• SQL
• Security
• Vue
• Windows
• UX UI Design
• Cloud
• Postman

We provide an enterprise-grade Field Service Management platform serving multi-vertical service operations across fire and security, facilities management, HVAC, medical devices, and MoD/defence supply chain customers in the UK, Ireland, and internationally. Our platform includes three core applications built on a .NET, VB.NET, and C# stack with SQL Server, deployed across Azure-hosted and on-premise Windows Server environments. We are investing heavily in a UX/UI overhaul, migration to Azure PaaS, and ongoing feature development. This is a hands-on hybrid role based in Marlow, with three days per week on site, offering a competitive salary of up to 50K, pension, private healthcare via BUPA, 30 days holiday plus bank holidays, an EAP, electric car and cycle-to-work schemes, and enhanced maternity/paternity pay. We value diversity, equality, and inclusion and welcome applicants from all backgrounds.