Senior R&D Software Developer Jobs in Baltimore, MD

We are seeking Software Developers and Data Analysts with at least two years of experience in website coding, basic graphics techniques, Structured Query Language (SQL), Hypertext Markup Language (HTML), and Extensible Markup Language (XML).
The Senior .NET Core Developer will be a key contributor to the development and maintenance of SENTINEL, a web-based application used to track counterintelligence related entities and their relationships. This role requires an exceptional developer with deep expertise in .NET Core, C#, and related technologies.
This work supports on-going Army modernization efforts to bring cutting edge technologies to CI and HUMINT operations. Developers on this program work closely with analysts and geospatial engineers to develop application support to dynamic operations through cloud based databasing and collaboration.
Work Schedule:
M-F 8 hours with the ability to flex schedules, core hours on contract are 9am - 3pm
Essential Responsibilities: (describe the day-to-day)

• Software Development:
  • Develop new, cutting-edge software solutions for SENTINEL utilizing strong C# programming skills.
  • Maintain and enhance existing functionality within the SENTINEL application.
  • Contribute to the design and architecture of new features and components.
• .NET Core Application Development:
  • Develop enterprise-level web applications utilizing .NET Core, Razor Pages, Dependency Injection, Web APIs, and HTTP request/response handling.
• Data Management:
  • Utilize Entity Framework (EF) Core, Code First, Migrations, and LINQ syntax to manage data interactions with SQL Server, including data insertion, querying, updating, and deletion.
• Development Environment & Tools:
  • Daily use of Visual Studio and SQL Server Management Studio for bug fixing and new functionality development.
  • Daily use of Azure DevOps and Git for source code management, version control, and collaboration.
• Database Administration & Optimization:
  • Utilize a strong understanding of SQL Server and relational database principles to create, modify, and delete database objects.
  • Troubleshoot and address database performance issues.
• Front-End Development:
  • Possess exceptional JavaScript development skills.
  • Implement AJAX calls, form validation, DOM manipulation, and interactivity using JavaScript.
  • Style web applications utilizing CSS and UI layout frameworks such as Bootstrap 5 to create visually appealing and consistent user interfaces.
• Collaboration & Mentorship:
  • Collaborate with other developers, analysts, and stakeholders throughout the software development lifecycle.
  • Potentially mentor junior developers and share knowledge.

Work Environment, Physical Demands, and Mental Demands:
Office environment with little physical demand, but creative development demanding mental focus
Minimum Requirements:

• Master's degree in a relevant field and 12 years' relevant experience; with a portion of the experience within the last 2 years, or
• Bachelor's degree and 14 years of relevant experience, or
• Associate degree and 16 years of relevant, or
• High school diploma and 20 years of relevant experience.
• Security Plus certified
• Qualified at Information Assurance Technical Workforce Requirement Level II as defined in DoD 8570.01-M, Table C3.T1.
• Skilled in data visualization and use of graphical applications, including Microsoft Office (Power BI) and Tableau; major data science languages, such as R and Python; managing and merging of disparate data sources, preferably through R, Python, or SQL; statistical analysis; and data mining algorithms.
• 10+ years of professional software development experience with a strong focus on .NET technologies.
• .NET Core Expertise: Deep understanding and practical experience with .NET Core development.
• C# Proficiency: Exceptional C# programming skills with a thorough understanding of object-oriented programming principles.
• EF Core & SQL Server: Extensive experience with Entity Framework Core, Code First, Migrations, and SQL Server.
• JavaScript & Front-End Technologies: Solid understanding of JavaScript, HTML, CSS, and modern front-end frameworks (e.g., Bootstrap).
• DevOps Proficiency: Proficient with Azure DevOps and Git for source control, CI/CD, and collaboration.
• Problem-Solving: Exceptional analytical and problem-solving skills.

Security Clearance Required:
Current Top Secret//SCI required
Minimum Education:
HS Diploma with years of experience supplementing education/ bachelor's degree in relevant field or 14 years of relevant experience (flexible)
Minimum Years of Experience:
14 years, flexible and depending on degree completion
Required Certifications:

• Security Plus certified

Preferred Qualifications: AI if applicable to your program

• C# programming skills
• Understanding of ASP.NET Core 6.0 and related concepts to include Razor Pages, Dependency Injection and Middleware
• Understanding of Entity Framework (EF) Core 6.0
• Experience using both Visual Studio and SQL Server Management Studio
• Experience using Team Foundation Server (TFS), Azure DevOps and/or Git as a source control repository and understand branching and merging concepts
• Understanding of SQL Server, understanding of relational database principles in general and the ability to create, modify and delete database objects (i.e. tables, views, stored procedures, functions, triggers, etc)
• Working knowledge of JavaScript development (i.e. general JavaScript knowledge, JQuery, etc)
• Knowledge of Cascading Style Sheets (CSS) and UI layout frameworks (i.e. Bootstrap, Flexbox, etc)
• Understanding of using LINQ and Entity Core (EF) to insert, query and update data in SQL Server
• Ability to troubleshoot SQL Server performance issues to identify bottlenecks, poor performing queries, etc
• Experience reverse engineering legacy source code to implement priority bug fixes and enhancement requests
• Working knowledge of IIS and Web application deployments

Other Responsibilities:
Safety - Amentum enforces a safety culture whereby all employees have the responsibility for continuously developing and maintaining a safe work environment. As appropriate, each employee is responsible for completing all training requirements and fulfilling all self-aid/buddy aid responsibilities, participating in emergency response tasks and serving on safety committees and teams.
Quality - Quality is the foundation for the management of our business and the keystone to our goal of customer satisfaction. It is our policy to consistently provide services that meet customer expectations. Accordingly, each employee must conform to the Amentum Quality Policy and carry out job activities in compliance with applicable Amentum Quality System documents and customer contracts. Each employee must read and understand his/her Quality Management and Customer Satisfaction responsibilities.
Procedure Compliance - Each employee must read, understand and implement the general and specific operational, safety, quality and environmental requirements of all plans, procedures and policies pertaining to his/her job. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability or protected veteran status.
#javelin
Compensation Details:
$140,000 - $147,000
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:
06/30/2026 - 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.