Senior .NET Developer – Onsite, Secret-Cleared, Agile

Marathon TS; Arlington (VA); On-site; USD 120,000 - 160,000; Full time

Job summary

Marathon TS is seeking a Senior .Net Application Developer to support the critical mission of the DEA in Arlington/Merrifield, VA with onsite work five days a week. Responsibilities include developing and enhancing code within the Concorde framework, applying Agile practices, collaborating across environments, and supporting legacy applications while adopting DevSecOps principles.

The role requires 8+ years of ASP.NET MVC experience, 5+ years .NET Core, strong SQL/XML skills, and US Citizenship

Qualifications

• 8+ years of ASP.NET C# MVC web development with VS2017+.

Responsibilities

• Develop and enhance code within the Concorde framework for high-quality solutions.
• Participate in Agile sprints, ceremonies, and daily standups to drive delivery.
• Collaborate across Classified, Unclassified, and SBU environments for data and app integration.
• Support non-Concorde legacy applications to ensure seamless operations.
• Apply DevSecOps practices and packaging/documentation for production deployments.

Skills

ASP.NET MVC

.NET Core

Agile

SQL relational DB

TFS / Azure DevOps

XML

Education

B.S. in CS/Eng

Tools

Visual Studio 2017+

Team Foundation Server

SQL Server

Job description

Marathon TS is seeking a Senior .Net Application Developer to support the critical mission of the DEA in Arlington/Merrifield, VA with onsite work five days a week. Responsibilities include developing and enhancing code within the Concorde framework, applying Agile practices, collaborating across environments, and supporting legacy applications while adopting DevSecOps principles.

The role requires 8+ years of ASP.NET MVC experience, 5+ years .NET Core, strong SQL/XML skills, and US Citizenship