.NET Application Support Engineer

About the role

TransCore (TRN), a subsidiary of ST Engineering, is seeking a full-time .NET Application Support Engineer to join our team in Ashburn, Virginia. Other locations of consideration are Pennsylvania and New Jersey.

Responsibilities

• Own L2/L3 technical support for high-availability .NET applications, APIs, and Windows Services.
• Diagnose runtime errors, application crashes, and performance bottlenecks.
• Analyze and debug C# source code to identify defects, trace execution flows, and deliver root-cause analysis (RCA) to the core development teams.
• Configure, maintain, and optimize IIS (Internet Information Services) web servers, application pools, and environment variables across staging and production servers.
• Develop and maintain a library of PowerShell scripts to automate routine operations, application deployments, system health checks, and data fixes.
• Troubleshoot application data faults by writing and optimizing complex T-SQL queries, analyzing stored procedures, and resolving SQL Server bottlenecks.
• Proactively monitor application health logs (Event Viewer, Azure Monitor, or similar) and maintain detailed technical documentation for known errors, environment configurations, and recovery procedures.

Requirements

• The .NET Ecosystem: 3+ years of experience supporting or developing applications using .NET Core, .NET Framework (4.x+), ASP.NET MVC, and Web API.
• Scripting: Strong proficiency in PowerShell (preferred) for systems automation and configuration management.
• Web Servers: Solid understanding of IIS architecture, including site bindings, SSL certificate management, and app pool optimization.
• Databases: Proficient with Microsoft SQL Server, including writing T-SQL queries, joins, and understanding database indexing.
• Diagnostics Tools: Experience utilizing windows diagnostic utilities, Event Viewer, log parsers (Serilog/Log4Net), or APM tools to isolate infrastructure vs. code issues.

Qualifications

• Three to five years of previous experience.
• Familiarity with cloud infrastructure platforms (Azure, Google, AWS).
• Experience working with containerization tools like Docker.
• Experience with CI/CD tools (Azure DevOps, Jenkins, or GitHub Actions).
• Experience with ticketing systems like Jira.

Skills

• The "Detective" Mindset: A persistent, systematic approach to troubleshooting rather than guessing or applying superficial fixes.
• Strong Communicator: Ability to clearly explain complex technical issues to both non-technical stakeholders and core software developers.
• Autonomy: Comfortable balancing multiple shifting priorities in a fast-paced production environment.

Benefits

TransCore provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, gender, sexual orientation, gender identity or expression, national origin, age, disability, genetic information, marital status, amnesty, or status as a covered veteran in accordance with applicable federal, state and local laws. We especially invite women, minorities, veterans, and individuals with disabilities to apply.

Pay

N/A

Schedule

N/A

Application Instructions

N/A

Equal Opportunity Employer

We are committed to providing equal employment opportunities to all employees and applicants for employment without regard to race, color, religion, gender, sexual orientation, gender identity or expression, national origin, age, disability, genetic information, marital status, amnesty, or status as a covered veteran in accordance with applicable federal, state and local laws.

TransCore

To learn more about TransCore please visit us at www.transcore.com.