Senior App Support Engineer – Hybrid London (12m FTC)

Third Nexus Group Limited; Greater London; Hybrid; GBP 41,000 - 50,000; Full time

Job summary

Third Nexus Group Limited is seeking a Senior Application Support Engineer to maintain enterprise ASP.NET MVC and legacy .NET applications in a London hybrid setting. The role covers production support, incident resolution, defect analysis and coordination with development and infrastructure teams.

The ideal candidate has strong experience with legacy web apps, frontend tech like jQuery, and ITSM tooling. The position is a 12-month fixed-term contract with potential for extension.

Qualifications

• Experience with ASP.NET MVC Framework in enterprise environments.
• Proficient in jQuery and SQL Server.
• Strong knowledge of .NET 10 and C#.
• Experience troubleshooting production applications and incident management.

Responsibilities

• Provide Level 2 and Level 3 application support.
• Analyse and resolve production incidents, service requests, and defects.
• Troubleshoot across presentation, business, data-access layers and database.
• Support apps using ASP.NET MVC Framework, .NET 10, jQuery and SQL Server.
• Investigate application logs, stack traces, database issues, and integration failures.
• Perform root-cause analysis and prepare permanent fixes or workarounds.
• Develop minor enhancements, bug fixes, and configuration changes.
• Support REST-based integrations and troubleshoot API-related issues.
• Collaborate with development, database, infrastructure, and business teams.
• Participate in incident, problem, and change-management related meetings and processes.
• Prepare technical documentation, knowledge articles and support procedures.
• Participate in on-call or shift-based support, if required.

Skills

ASP.NET MVC Framework

jQuery

SQL Server

C#

HTML

CSS

JavaScript

ITIL/ITSM knowledge

production incident troubleshooting

MVC architecture and auth

Tools

ServiceNow

SQL Server Management Studio

Job description

Third Nexus Group Limited is seeking a Senior Application Support Engineer to maintain enterprise ASP.NET MVC and legacy .NET applications in a London hybrid setting. The role covers production support, incident resolution, defect analysis and coordination with development and infrastructure teams.

The ideal candidate has strong experience with legacy web apps, frontend tech like jQuery, and ITSM tooling. The position is a 12-month fixed-term contract with potential for extension.