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SR .NET DEVELOPER

Company:
Twenty First Systems
Location:
Bethesda, MD, 20811
Posted:
December 15, 2025
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Description:

JOB TITLE - SR .NET DEVELOPER

Job Title: .Net Developer

Reports to: Program Manager

Location: Bethesda, MD; Arlington, VA

Start Date: Immediately

Clearance Requirement: Public Trust

Tax Term:-W2 or C2C

Hourly Rate:- 70$

Visa Status:- Must be a U.S. Citizen or U.S. Legal Permanent Resident(GC)

Job Summary:

The experienced.NET Developer is a member of the project team who takes responsibility for implementing parts of the system architecture using best practices in an agile development environment. This will include coding, unit testing, using design patterns, learning new technologies, and becoming an expert in one part of the system. The candidate will also be expected to provide technical leadership, architectural support, and overall solution design support.

Qualified applicants must be detail-oriented, result-driven individuals who work well within team environments and have good interpersonal skills, as well as good client interaction skills.

Responsibilities:

Responsible for design, development, and implementation of solutions to integrate with other applications to exchange data

Work with system owners, business owners, technical teams, and functional teams to design, implement, test, and validate a system.

Write .NET and ASP.Net code based on requirements defined in use cases.

Develop Object Oriented code and/or provide maintenance and enhancements to existing code using .NET and ASP .NET

Work with the team and business users to understand requirements, write functional and technical specifications

Work with a multidisciplinary set of stakeholder, contractors, and team members to design and develop software solutions

Develop new code and/or support operations, maintenance, and enhancements of existing code.

Develop conceptual and technical design including use of OOA and OOD techniques.

Conduct multiple levels of testing including unit, system, integration and performance.

Design, develop, and test software solutions primarily composed of Microsoft technologies

Estimate and plan releases

Requirements:

Must be a U.S. Citizen or U.S. Legal Permanent Resident

Eligible for U.S. Government Clearance.

Experience Guidelines:

Minimum 5 years in systems integration and development, package implementation, and/or interactive design

Minimum 4 years in .NET development

Knowledge and Experience in C#, .Net, ASP .NET, and Microsoft SQL Server

Solid understanding of all parts of Software Engineering (e.g. Requirements, Design, Implementation, Testing) and the Software Development Life Cycle (SDLC)

Experience working in agile or iterative SDLCs

Experience with Object Oriented Technologies

Ability to work with key owners and stakeholders to document requirements

Experience with .NET-specific technologies such as Windows Presentation Foundation (WPF), Windows Communication Foundation (WCF) or Workflow Foundation (WF) is desirable

Experience with SharePoint is highly desirable

Experience integrating, modifying, and configuring Commercial Off The Shelf (COTS) products

Education:

Bachelor's Degree required from college or University

About Our Client

Our client is a leading provider of consulting, technology, and marketing services to a wide array of U.S. governmental agencies. Focused on driving long-term change and transforming the citizen experience, we use technology to help agencies become more accessible and transparent. With a track record of delivering mission-critical solutions and the ability to leverage commercial best practices, they serve as trusted advisers to government agencies such as the Federal Bureau of Investigation, Library of Congress, National Institutes of Health, United States Department of Health and Human Services, and United States Department of Homeland Security.

Sapient is a registered service mark of Sapient Corporation.

*Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions of this role, which include hearing, speaking, typing, and occasionally moving and/or lifting up to 15 pounds.

Our client is an Equal Opportunity / Affirmative Action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, orientation, national origin, disability, or protected veteran status.

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