Senior .NET/C# Software Developer

Purpose and Impact: Are you interested in using your skills to help shape the Cyber, Security, & Intel space? If so, look no further. Amentum is seeking a Senior .NET/C# Software Developer to join our team of passionate individuals in Ft. Belvoir, VA. In this role you will support challenging, mission-critical projects that make a direct impact on the Nation’s security and intelligence mission. INSCOM executes mission command of operational intelligence forces; conducts worldwide multidiscipline and all source intelligence operations; delivers advanced skills training, linguist support, specialized quick reaction capabilities, intelligence related logistics, and communications in support of Army, Joint, and Coalition command and the National Intelligence Community. You will be part of a team that provides comprehensive automation/information technology support to the Data Capabilities Division (DCD) worldwide intelligence dissemination, data management, and knowledge management missions. Work Schedule: • Monday-Friday, 8 hours/day, Core hours: 0900-1500 Essential Responsibilities: • Provide application development for a Microsoft-oriented enterprise environment (“including, but not limited to MS.NET, C#, MVC 4 , and Internet Information Services (IIS) for Windows Server web development knowledge) for custom in- house developed web applications. • Collaborate with peers to review code to ensure that best practices, team norms, and coding standards are followed. • Provide web development and version control for a Microsoft-oriented enterprise environment using Government provided tools (Microsoft Visual Studio and GitLab). • Estimate the level of effort required for all design, development, deployment, and testing and provide information to COR. • Participate in an iterative development team through all facets of to include sprint planning, daily scrum meetings, reviews, and retrospectives. • Develop documentation to include test plans, end-user documentation, wireframes, mockups, Use Case Diagrams, and flowcharts. All documentation shall be stored in identified Government document repositories. • Use Azure Dev Ops (ADO) or GitLab for all code changes and version controls. • Create/update test plans and record the results within the developer documentation. • Collaborate with the Quality Assurance (QA) team to mitigate all findings identified during testing. • Build fully deployable packages for development, staging, integration, and production environments and submit deployment requests for approval. • Use all approved Government provided templates for required documentation and ensure all development related documents are stored in a single document repository, identified by the Government. • Leverage advanced programming skills to develop and incorporate mandatory fields of the DNI Audit.XML specification in accordance with ICS-500-27 Collection and Sharing of Audit Data. • Adhere to software development methods including Agile, SCRUM, and Lean in the development of software. • Provide project status reports to the Government at all stages of the project lifecycle as required. • Utilize JIRA to record and report bugs to Quality Assurance, project managers, and other stakeholders. • Ensure SOPs, “How To” guides, testing plans, and accreditation paperwork are complete for each application. Work Environment, Physical Demands, and Mental Demands: • Open office work desk within a SCIF. Minimum Requirements (Knowledge, Skills, and Abilities): • Ten years of experience in .NET Development (including .NET, C#, MVC 4 , and Internet Information Services (IIS) for Windows Server web development). • Eight years of experience in SQL database development stored procedures • Experience developing and re-architecting applications for containerization. • Five years of experience with Software Development Life Cycle Process (SDLC) • Five years of experience with software development Unit Testing, System Testing, • Functional Testing, User Acceptance Testing, or other development testing experience • Five years of experience mentoring junior personnel on proper practices and procedures. • Five years of experience documenting software defects using a bug tracking system and reporting defects to software developers and project managers • Experience developing applications in classified environments • Experience migrating and adapting applications for the Cloud. • Experience with data integrations between systems and across networks. • Experience with ETL processing of data especially data transformations. • Experience with XML and JSON data formats. • Experience troubleshooting and debugging applications in test and production environments. Clearance Required: • TS/SCI clearance with SBI and ability to attain SI, TK, G, HCS, and NATO Secret clearance Minimum Education: • High School Diploma Minimum Years of Experience: • 10 years Preferred Qualifications: • Experience with AI data modeling and/or data science application support. • Experience with SonarQube and applying Security STIGs. • Experience deploying applications in different environments. • AI literacy #javelin Compensation Details: 180-190K The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws. Benefits Overview: Our health and welfare benefits are designed to support you and your priorities. Offerings include: Health, dental, and vision insurance Paid time off and holidays Retirement benefits (including 401(k) matching) Educational reimbursement Parental leave Employee stock purchase plan Tax-saving options Disability and life insurance Pet insurance Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits. Original Posting: 01/06/2026 - Until Filled Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs. Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters. Welcome back! We encourage you to check on the status of your current job applications with us. You can also search for a list of our current job openings and see if there are any new positions that might be a good fit for you. Thank you for continued interest in employment with Amentum. For more than 100 years, Amentum has tackled the world’s toughest challenges to deliver agile and steadfast solutions to the U.S. government and its allies. With more than 50,000 employees on all seven continents and in more than 60 countries, Amentum delivers a broad range of operational support services to meet the critical needs of our clients. Our headquarters are in Chantilly, VA. Find us online at https://www.amentum.com/ If you need a reasonable accommodation for any part of the employment process, please contact us by email at TAOps@amentum.com and let us know the nature of your request and your contact information. Requests for accommodation will be considered on a case-by-case basis. EEO including Disability/Protected Veterans Labor Laws Posters Amentum has become aware of unauthorized individuals who are falsely using the Amentum name and /or logo in an attempt to solicit fees from potential job seekers. These deceptive and unauthorized individuals are soliciting money, promising placement in a position with Amentum. Please note any communication requesting any amount of money in exchange for employment with Amentum is fraudulent. These communications do not originate from Amentum and are not associated with the recruitment process. Amentum and its affiliates never charge candidates fees or payments of any kind in order to secure employment. As a precaution, we recommend you do not disclose personal or financial details to anyone as a response to an unsolicited email, social media, or dating website request. Amentum will never as ask for a placement fee or any other fee to expedite the hiring process. If you are contacted by anyone offering employment with Amentum, you should never be asked to pay a fee for recruiting. Amentum personnel will always send email from an identifiable corporate account (ending in @amentum.com) and never from a public email account like Yahoo!, Google, Gmail, or Hotmail. If you are contacted regarding a fraudulent employment proposal, we encourage you to alert your local law enforcement agency/police authority. To read more about Amentum’s commitment to ethics, please click here.