Senior Web Developer

General information

Requisition # R61398 Locations USA-WA-Tacoma Posting Date 06/29/2025 Security Clearance Required None Remote Type Hybrid Time Type Full time

Description & Requirements

Transform the future of federal services with ManTech! Join a vibrant, energetic team committed to enhancing national security and public services through innovative tech. Since 1968, we’ve partnered with Federal Civilian sectors to deliver impactful solutions. Engage in exciting projects in Digital Transformation, Cybersecurity, IT, Data Analytics and more. Ignite your career and drive change. Your journey starts now—innovate and excel with 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