Mantech

ManTech seeks a motivated, career-focused, and customer-oriented Senior Web Developer to join an on-site team in either: Falls Church, VA, San Antonio, TX, Aurora, CO, or Tacoma, WA.

Responsibilities include but are not limited to:

• Full-stack (but front-end biased) individual contributor and mentor for teams responsible for the design, development, and maintenance of dynamic web applications across a mix of legacy (.NET, Sitecore) and modern architectures.
• Lead application development efforts using responsive design principles and modern JavaScript frameworks; while collaborating with UX designers, back-end developers, content editors, and system administrators to deliver cohesive, user-focused digital experiences.
• Troubleshoot and resolve production issues across multiple platforms, including legacy compatibility issues.
• Support integration with content management systems (CMS), web APIs, and enterprise services including identity/authentication, logging, and analytics.
• Drive modernization and migration of legacy codebases and UI components to modern standards and frameworks.
• Lead code reviews and establish standards for knowledge sharing across all development teams.   

Minimum Qualifications:

• 4+ years of progressive experience as a software developer with at least 1+ years as a senior developer or technical lead spanning multiple application development projects/teams simultaneously.
• Bachelor’s degree in Computer Science, Software Engineering, Information Technology, or related discipline. Additional relevant military or professional experience (typically 4 years) may be substituted in lieu of a degree.
• Deep expertise in front-end technologies including HTML5, CSS3, JavaScript, and responsive frameworks (e.g., Bootstrap).
• Experience with one or more JavaScript frameworks such as React, Angular, or Vue.
• Strong C# skills, with experience with modern .NET Core, Razor Pages, or Blazor.
• Working knowledge of ASP.NET (Web Forms and/or MVC) and integration with RESTful APIs or web services.
• Proficiency with version control systems like Git and development workflows using Azure DevOps GitHub, or similar platforms.
• Experience with Sitecore CMS (development, templating, content workflows, personalization, or integration).
• Prior experience working with user bases exceeding 10,000, preferably in contexts involving operational healthcare, clinical training, or readiness systems. 

Preferred Qualifications:

• Familiarity with DoD or federal cybersecurity standards (RMF, STIG, IL4/IL5, HIPAA).
• Experience supporting Defense Health Agency (DHA), MHS, Veterans Administration (VA), or other federal health agencies.
• Experience with Power Platform (Power Pages, Power Automate) and integration into web-based workflows.
• Experience with containerization (e.g., Docker) and cloud-native development on Azure or AWS.
• Certifications such as Azure Developer Associate or Microsoft Web Applications Developer (legacy MCSD).

Clearance Requirements:

• Must be a U.S. Citizen with the ability to obtain and maintain a Public Trust clearance.

Physical Requirements:

• Office work, typically sedentary with some movement around the office.
• Ability to travel (car or air) and present at conferences or meetings.