.NET Developer- TOP SECRET CLEARED

Marathon TS seeks an experienced .NET and C# developer to support a federal program within a legacy technology environment. The role requires an active Top Secret clearance and emphasizes maintaining, stabilizing, and enhancing existing systems while improving data integration and development workflows. This is an onsite position based in North Charleston, South Carolina.

Responsibilities

• Support development and maintenance of .NET/C# applications within a legacy system environment using Microsoft Visual Studio.
• Assist with establishing and stabilizing development and production environments, coordinating with stakeholders to address setup, configuration, and deployment challenges.
• Design and implement data movement and integration solutions across diverse platforms including legacy systems, databases, and modern tools.
• Analyze existing systems, including COBOL or mainframe components, and recommend practical enhancements to improve performance, reliability, and maintainability.
• Support data modeling and ETL processes to ensure consistent and reliable data flow.
• Collaborate with federal staff, vendors, and internal teams to support continuity of operations and technical alignment.
• Contribute to system and network architecture discussions, including connectivity and performance considerations.
• Support evaluation and application of modern tools and technologies, where appropriate, to enhance data processing and analytics capabilities.
• Identify opportunities to improve efficiency and scalability within existing system constraints.
• Assist with documentation, knowledge transfer, and system continuity efforts.

Requirements

• Bachelor's degree.
• .NET Framework / .NET Core
• C# development
• Microsoft Visual Studio development environments
• Oracle and/or Microsoft SQL Server (MS SQL)
• Experience with data integration, data movement, or ETL processes
• Familiarity with legacy systems, including COBOL or mainframe environments
• Experience troubleshooting and supporting development and deployment environments
• Understanding of system integration and distributed systems
• Strong communication and collaboration skills

Technologies

• .NET Framework / .NET Core
• C#
• Microsoft Visual Studio
• Oracle
• Microsoft SQL Server (MS SQL)
• COBOL
• Databricks
• Azure

Benefits

• 401(k)
• Dentical insurance
• Health insurance
• Paid time off
• Vision insurance

Key Attributes

• Strong problem solving mindset for bridging legacy and modern systems
• Practical, detail oriented approach to system stability and incremental improvement
• Ability to work effectively in structured environments with evolving requirements
• Collaborative approach across government, contractor, and vendor teams
• Commitment to documentation, knowledge sharing, and operational continuity

Security Clearance

Active Top Secret clearance. Ability to obtain TS/SCI.

Compensation

Up to $44.23 per hour

Experience

• .NET: 7 years (Required)
• C#: 7 years (Required)

Application Questions

• Do you hold any of the following certifications: CompTIA Security+ (or equivalent baseline certification), CompTIA Network+, Microsoft Certified: Azure Fundamentals or Azure Solutions Architect, Databricks Data Engineer Certification (desired), ITIL Foundation Certification?
• How many years of experience do you have in software development and/or system architecture?

Location and Commute

• Ability to commute: North Charleston, SC 29419 (Required)
• Work location: In person