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Senior Net Developer Jobs in Gaithersburg, MD (NOW HIRING)

Marathon TS

Be Seen First

Senior NET Developer

Arlington, VA · On-site

$140K - $160K/yr

Marathon TS is seeking a Senior .Net Application Developer to support the critical mission of the Drug Enforcement Administration (DEA). We are developing the applications that provide the tools ...

Twenty First Systems

SR .NET DEVELOPER

Bethesda, MD · On-site

$58.75 - $75/hr

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 ...

Twenty First Systems

SR .NET DEVELOPER

Bethesda, MD

$58.75 - $75/hr

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 ...

Annexa Inc.

Senior .Net Developer

Washington, DC

$62.25 - $79.25/hr

Senior .NET Developer Employment Type: Onsite Annexa is currently supporting D.C. Government ... NET. * 11+ years of experience with database technologies, development methodologies, and ...

kgs

Senior .Net Full-Stack Developer

Washington, DC

Kadiak, LLC, a Koniag Government Services company, is seeking a Senior Net Full-Stack Developer with a Top-Secret security clearance to support Kadiak and our government customer in Washington, DC.

kgs

Senior .Net Full-Stack Developer

Washington, DC

Kadiak, LLC, a Koniag Government Services company, is seeking a Senior Net Full-Stack Developer with a Top-Secret security clearance to support Kadiak and our government customer in Washington, DC.

USM Corporation

.Net Developer

Reston, VA

$50.25 - $66.25/hr

The Sr Software Engineer, reporting to our Sr Director of Client Implementation, in our Client Tech Implementation team, will play a critical role in building Desktop & mobile based web applications.

NetImpact Strategies

Senior .NET Developer

Herndon, VA · On-site +1

$56.50 - $72/hr

NetImpact Strategies is seeking a Senior .NET Developer to join our talented team supporting the development, modernization, and operation of a high-availability, enterprise-scale application in an ...

NetImpact Strategies

Senior .NET Developer

Herndon, VA

$56.50 - $72/hr

NetImpact Strategies is seeking a Senior .NET Developer to join our talented team supporting the development, modernization, and operation of a high-availability, enterprise-scale application in an ...

NetImpact Strategies

Senior .NET Developer

Herndon, VA

$56.50 - $72/hr

NetImpact Strategies is seeking a Senior .NET Developer to join our talented team supporting the development, modernization, and operation of a high-availability, enterprise-scale application in an ...

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All JobsNet Developer JobsSenior Net Developer JobsSenior Net Developer Jobs in Gaithersburg, MD

Senior Net Developer information

See Gaithersburg, MD salary details

$39

$65

$84

How much do senior net developer jobs pay per hour?

As of Aug 31, 2026, the average hourly pay for senior net developer in Gaithersburg, MD is $65.04, according to ZipRecruiter salary data. Most workers in this role earn between $57.12 and $72.74 per hour, depending on experience, location, and employer.

What is the difference between Senior Net Developer vs .NET Developer?

AspectSenior Net Developer.NET Developer
Required Experience5+ years, leadership skills1-3 years, foundational skills
CertificationsMicrosoft Certified: Azure Developer Associate or similarOptional, but beneficial
Work EnvironmentLead projects, mentor juniors, design architectureDevelop applications, write code, troubleshoot
ResponsibilitiesArchitect solutions, oversee team, optimize performanceBuild and maintain .NET applications, implement features

The main difference between a Senior Net Developer and a .NET Developer lies in experience, responsibilities, and leadership. Senior Net Developers typically have more years of experience, hold advanced certifications, and take on leadership roles in project design and team mentoring. In contrast, .NET Developers focus on coding and application development with less emphasis on leadership or architecture. Both roles are essential in the software development lifecycle, but the senior position involves broader strategic responsibilities.

What are the most commonly searched types of Net Developer jobs in Gaithersburg, MD?

The most popular types of Net Developer jobs in Gaithersburg, MD are:

What cities near Gaithersburg, MD are hiring for Senior Net Developer jobs?

Cities near Gaithersburg, MD with the most Senior Net Developer job openings:

Senior Net Developer jobs near you
Infographic showing various Senior Net Developer job openings in Gaithersburg, MD as of August 2026, with employment types broken down into 82% Full Time, 6% Part Time, and 12% Contract. Highlights an 80% Physical, 5% Hybrid, and 15% Remote job distribution, with an average salary of $135,293 per year, or $65 per hour.

Senior NET Developer

Marathon TS

Arlington, VA • On-site

$140K - $160K/yr

Full-time

Medical, Dental, Vision, PTO

Posted 5 days ago

Be Seen First

After you apply to this job, you can share why you’re interested to jump to the top of the candidate list.

Job description

Marathon TS is seeking a Senior .Net Application Developer to support the critical mission of the Drug Enforcement Administration (DEA). We are developing the applications that provide the tools necessary for our drug enforcement agents and the greater law enforcement community to take illicit drugs and those who traffic them off the street. The current opioid crisis in our country is testament to the critical mission of the DEA.

Location: Arlington, VA or Merrifield, VA (5 days a week onsite)

Clearance: Active Secret clearance

Responsibilities:

  • Works in a collaborative team environment to develop and enhance code for applications built within the Concorde framework, ensuring high-quality and efficient solutions.
  • Demonstrates strong expertise in Agile development methodologies through daily activities, including sprint participation, task execution, and adherence to Agile principles.
  • Participates in meetings, discussions, and demonstrations related to the development of applications and associated data across Classified, Unclassified, and Sensitive but Unclassified environments.
  • Possesses the knowledge and capability to support non-Concorde legacy applications as needed, contributing to seamless integration and operational continuity.
  • Possesses a foundational understanding of DevSecOps principles.

Requirements:

  • Top-notch experience in Microsoft .NET languages (primarily ASP.NET, C#, and LINQ), technologies (MVC, Entity Framework, Unity), and tools (Visual Studio 2010, Team Foundation Server, ReSharper). Experience with SharePoint, NHibernate, jQuery and JavaScript, AJAX, HTML and CSS, Oracle and SQL Server databases, T4 templates, and even Classic ASP, is also desired.
  • Recent 8+ years of ASP.Net C# MVC-based web development experience using Visual Studio 2017 or higher.
  • 5+ years of .Net Core/Standard development experience.
  • 5+ years of experience with Agile development methodologies, including participation in sprints, backlog grooming, and Agile ceremonies.
  • Experience as a developer in a software environment that supported more than 10,000 users and a Relational Database Management System (RDBMS) with more than 250 tables and 1 million total rows.
  • Significant recent Java Script development experience.
  • Significant development experience with Cascading System Sheets (CSS).
  • Experience with relational data models and SQL.
  • Experience with XML and programming libraries for XML manipulation.
  • Agile project and development experience utilizing Team Foundation Server.
  • Ability to quickly deliver small projects, and to frequently transition between projects and applications.
  • Experience in packaging and delivering software and documentation to a production environment.
  • Excellent communication skills.
  • Must be a U.S. Citizen and have an active Secret clearance.
  • Applicants selected will be subject to a government security background investigation and must meet eligibility and DEA suitability requirements.

Education/Experience:

  • Bachelor's degree in Computer Science, Engineering, or a related field (14+ years of demonstrated experience may be substituted).
  • 10+ years of general experience, including 10 years of specialized and/or hands-on experience in Agile development methodologies

Company Description

Marathon TS provides a full range of professional services for clients that require support from professionals with specialized skills and experience in a specific technical area or subject matter. Marathon TS also provides IT solutions, including strategy, operations, transformation and mission support.

Marathon TS logo

About Marathon TS

Sourced by ZipRecruiter

Marathon TS provides a full range of professional services for clients that require support from professionals with specialized skills and experience in a specific technical area or subject matter. Marathon TS also provides IT solutions, including strategy, operations, transformation and mission support.

Industry

It services

Company size

51 - 200 Employees

Headquarters location

Sterling, VA, US

Year founded

2009

Social media

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