Application Support Engineer
Posted on Jul 2, 2026 by CV-Library
Marlow, Buckinghamshire, United Kingdom
IT
Immediate Start
£40k - £50k Annual
Full-Time
Application Support (.Net/SQL) Hybrid/Marlow 3 days per week on site Up to 50K (maybe negotiable)
Our 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 Role
Their 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. They are a strategic 'Spearhead' product, with active investment in a UX/UI overhaul, migration to Azure PaaS, and ongoing feature development.
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 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 Tesseract's 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 components of the application.
* Troubleshoot SOAP and REST API integration issues raised by customers connecting third-party or ERP systems to Tesseract.
* Investigate issues at the infrastructure level — Windows Server (2019/2022), IIS, and SQL Server configuration — across 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/engineering teams.
* Log well-evidenced defects into Jira with clear reproduction steps, logs, and impact assessment, and track them through to resolution and release.
What You’ll Need:
Essential
* 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 — confident writing non-trivial queries (joins, 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 (WebForms and/or MVC) and how they're deployed under IIS.
* Comfortable working with Windows Server environments — troubleshooting application, IIS, and OS-level issues.
* Experience with API troubleshooting — inspecting SOAP or REST requests/responses (e.g. via Postman, SoapUI, or browser dev tools) to isolate integration issues.
* Strong analytical and diagnostic skills — able to work methodically from symptom to root cause on ambiguous or intermittent issues.
* Excellent communication skills, comfortable explaining technical findings to both customers and engineers.
What They’ll Offer You:
Competitive salary
Pension - 5% company contribution, 3 % personal contribution
Private Healthcare via BUPA
A holiday allowance of 30 days', plus bank holidays per annum
Employee Assistance Program (EAP)
Electric car scheme
Cycle to work scheme
Enhanced Maternity/Paternity Pay
Our client is an equal-opportunity employer and values diversity in its workforce. We encourage applicants from all backgrounds to apply.
SmartSourcing are a Disability Confident Employer and we promote, celebrate and value diversity, we are committed to promoting equality and inclusion for all
Our 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 Role
Their 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. They are a strategic 'Spearhead' product, with active investment in a UX/UI overhaul, migration to Azure PaaS, and ongoing feature development.
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 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 Tesseract's 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 components of the application.
* Troubleshoot SOAP and REST API integration issues raised by customers connecting third-party or ERP systems to Tesseract.
* Investigate issues at the infrastructure level — Windows Server (2019/2022), IIS, and SQL Server configuration — across 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/engineering teams.
* Log well-evidenced defects into Jira with clear reproduction steps, logs, and impact assessment, and track them through to resolution and release.
What You’ll Need:
Essential
* 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 — confident writing non-trivial queries (joins, 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 (WebForms and/or MVC) and how they're deployed under IIS.
* Comfortable working with Windows Server environments — troubleshooting application, IIS, and OS-level issues.
* Experience with API troubleshooting — inspecting SOAP or REST requests/responses (e.g. via Postman, SoapUI, or browser dev tools) to isolate integration issues.
* Strong analytical and diagnostic skills — able to work methodically from symptom to root cause on ambiguous or intermittent issues.
* Excellent communication skills, comfortable explaining technical findings to both customers and engineers.
What They’ll Offer You:
Competitive salary
Pension - 5% company contribution, 3 % personal contribution
Private Healthcare via BUPA
A holiday allowance of 30 days', plus bank holidays per annum
Employee Assistance Program (EAP)
Electric car scheme
Cycle to work scheme
Enhanced Maternity/Paternity Pay
Our client is an equal-opportunity employer and values diversity in its workforce. We encourage applicants from all backgrounds to apply.
SmartSourcing are a Disability Confident Employer and we promote, celebrate and value diversity, we are committed to promoting equality and inclusion for all
Reference: 225320718
https://jobs.careeraddict.com/post/113499953
Application Support Engineer
Posted on Jul 2, 2026 by CV-Library
Marlow, Buckinghamshire, United Kingdom
IT
Immediate Start
£40k - £50k Annual
Full-Time
Application Support (.Net/SQL) Hybrid/Marlow 3 days per week on site Up to 50K (maybe negotiable)
Our 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 Role
Their 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. They are a strategic 'Spearhead' product, with active investment in a UX/UI overhaul, migration to Azure PaaS, and ongoing feature development.
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 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 Tesseract's 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 components of the application.
* Troubleshoot SOAP and REST API integration issues raised by customers connecting third-party or ERP systems to Tesseract.
* Investigate issues at the infrastructure level — Windows Server (2019/2022), IIS, and SQL Server configuration — across 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/engineering teams.
* Log well-evidenced defects into Jira with clear reproduction steps, logs, and impact assessment, and track them through to resolution and release.
What You’ll Need:
Essential
* 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 — confident writing non-trivial queries (joins, 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 (WebForms and/or MVC) and how they're deployed under IIS.
* Comfortable working with Windows Server environments — troubleshooting application, IIS, and OS-level issues.
* Experience with API troubleshooting — inspecting SOAP or REST requests/responses (e.g. via Postman, SoapUI, or browser dev tools) to isolate integration issues.
* Strong analytical and diagnostic skills — able to work methodically from symptom to root cause on ambiguous or intermittent issues.
* Excellent communication skills, comfortable explaining technical findings to both customers and engineers.
What They’ll Offer You:
Competitive salary
Pension - 5% company contribution, 3 % personal contribution
Private Healthcare via BUPA
A holiday allowance of 30 days', plus bank holidays per annum
Employee Assistance Program (EAP)
Electric car scheme
Cycle to work scheme
Enhanced Maternity/Paternity Pay
Our client is an equal-opportunity employer and values diversity in its workforce. We encourage applicants from all backgrounds to apply.
SmartSourcing are a Disability Confident Employer and we promote, celebrate and value diversity, we are committed to promoting equality and inclusion for all
Our 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 Role
Their 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. They are a strategic 'Spearhead' product, with active investment in a UX/UI overhaul, migration to Azure PaaS, and ongoing feature development.
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 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 Tesseract's 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 components of the application.
* Troubleshoot SOAP and REST API integration issues raised by customers connecting third-party or ERP systems to Tesseract.
* Investigate issues at the infrastructure level — Windows Server (2019/2022), IIS, and SQL Server configuration — across 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/engineering teams.
* Log well-evidenced defects into Jira with clear reproduction steps, logs, and impact assessment, and track them through to resolution and release.
What You’ll Need:
Essential
* 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 — confident writing non-trivial queries (joins, 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 (WebForms and/or MVC) and how they're deployed under IIS.
* Comfortable working with Windows Server environments — troubleshooting application, IIS, and OS-level issues.
* Experience with API troubleshooting — inspecting SOAP or REST requests/responses (e.g. via Postman, SoapUI, or browser dev tools) to isolate integration issues.
* Strong analytical and diagnostic skills — able to work methodically from symptom to root cause on ambiguous or intermittent issues.
* Excellent communication skills, comfortable explaining technical findings to both customers and engineers.
What They’ll Offer You:
Competitive salary
Pension - 5% company contribution, 3 % personal contribution
Private Healthcare via BUPA
A holiday allowance of 30 days', plus bank holidays per annum
Employee Assistance Program (EAP)
Electric car scheme
Cycle to work scheme
Enhanced Maternity/Paternity Pay
Our client is an equal-opportunity employer and values diversity in its workforce. We encourage applicants from all backgrounds to apply.
SmartSourcing are a Disability Confident Employer and we promote, celebrate and value diversity, we are committed to promoting equality and inclusion for all
Reference: 225320718
Share this job:
Alert me to jobs like this:
Amplify your job search:
Expert career advice
Increase interview chances with our downloads and specialist services.
Visit Blog