Senior Application Support Engineer

Job Position - L3 .NET Application Support Engineer

Location - Onsite in Jersey City , NJ or Charlotte , NC

Experience - 10 years of experience

Salary :125k Per Year Benefits

Job Type - Full Time - Permanent Job

Job Description:

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We are looking for a Senior/L3 .NET Application Support Engineer with strong experience in production support, incident management, and RCA. The role involves handling critical L3 escalations, troubleshooting .NET (C#, ASP.NET MVC, Web API) applications, and optimizing performance using tools like Splunk, Dynatrace, AppDynamics. Candidates should have strong SQL Server skills, IIS knowledge, and experience with DevOps tools (Azure DevOps/Git) along with 10 years of experience.

Primary skills/ Tools: C#, .NET Framework, .NET Core, ASP.NET MVC, Web API, SQL Server, Production Support (L3), RCA, Incident/Problem Management, Splunk / Dynatrace / AppDynamics, IIS, Azure DevOps / Git, Windows Services, Performance Tuning

Experience: Minimum 10 years

 Handle L3 escalations from L1/L2 teams for critical .NET application issues.

 Perform advanced troubleshooting using logs, debugging tools, and code analysis.

 Conduct detailed Root Cause Analysis (RCA) for recurring production incidents.

 Implement permanent fixes, patches, and configuration changes to improve stability.

 Support and maintain applications built on .NET Framework, .NET Core, Web API, and MVC.

 Monitor production systems using tools such as Splunk, Dynatrace, AppDynamics, or Azure Monitor.

 Optimize application performance, including API latency and database query tuning.

 Manage and support Windows Services, Scheduled Jobs, and background worker processes.

 Coordinate with DevOps teams for deployments and release activities in QA, UAT, and PROD environments.

 Review and assess production change requests via Change Advisory Board (CAB) processes.

 Collaborate with developers to diagnose code-level issues and recommend solutions.

 Maintain and update documentation for incident resolution steps, SOPs, and known issues.

 Ensure adherence to ITIL processes: Incident, Problem, and Change Management. Participate in on-call rotation and provide support during high‑severity incidents or releases.

 Work closely with business stakeholders, providing timely communication and status updates during production events.