Required Clearance: Minimum Active Top Secret Clearance (Eligible for higher) 

Job Description: 
Summary:
We are seeking a Senior Systems Engineer to support the enhancement and sustainment of a mission-critical, web-based application used by law enforcement and intelligence analysts. This is a hands-on full-stack development role focused on maintaining and improving an existing application built on a Microsoft technology stack, including C#, SharePoint Server, and SQL Server, within a secure, on-premise environment.

Responsibilities:

• Design, develop, and maintain features for a web-based application using C# and the .NET framework
• Enhance and support applications built on SharePoint Server and SQL Server platforms
• Develop and maintain backend services, APIs, and database integrations
• Support frontend functionality to improve usability and performance for analyst-facing tools
• Troubleshoot and resolve application defects, performance issues, and system integration challenges
• Perform system testing, debugging, and validation of new and existing features
• Support ongoing operations and maintenance (O&M), including bug fixes and minor enhancements
• Participate in Agile development processes, including sprint planning, backlog grooming, and iterative delivery
• Ensure compliance with secure development practices and government cybersecurity standards

Required Skills & Qualifications:

• Strong experience in full-stack development using C#/.NET and Visual Studio
• Experience working with SharePoint Server (on-premise) and customizing SharePoint-based applications
• Proficiency in SQL Server, including database design, querying, and performance optimization
• Experience developing and maintaining web-based applications in a secure, enterprise environment
• Ability to troubleshoot complex application and integration issues
• Familiarity with Agile methodologies and development tools (e.g., Jira)
• Experience supporting both development and maintenance (O&M) activities
• Understanding of secure coding practices and working within regulated/government environments
• Bachelor’s degree or equivalent and up to eight (8) years of relevant experience.