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Lead .Net Developer with Security Clearance

System One Holdings, LLCArlington, VA🇺🇸United StatesPosted 2 Sept 2026

Why This Role Stands Out

As a Lead .Net Developer, you will guide a talented team, influence technical direction, and directly contribute to critical mission objectives within a reputable organization. This role is ideal for experienced developers with strong C# and JavaScript skills who excel at collaboration and are eager to drive software modernization efforts. If you are ready to lead and make a significant impact, this is an exceptional opportunity to advance your career.

Quick Overview

Seniority
Mid Senior
Work mode
On Site
Location
Arlington, VA, United States
Posted
1 week ago
SQLAgileC#CSS.NETASP.NETJava

Job Description

Lead .Net Developer
Arlington, VA or Merrifield, VA - ONSITE
Secret Clearance is required to start Must be able to obtain DEA clearance – 2-6 month process Responsibilities:

  • Lead a team of 5-7 developers in support of the mission with an ability to guide them on technical decisions, best practices, and team efficiencies
  • Lead technical planning meetings
  • Conduct peer code reviews and final code reviews
  • Demonstrate soft skills in terms of professionalism, conduct and execution in a client-facing role
  • Have an ability to effectively collaborate with leadership and customers
  • Ensure the Requirements Analysts data is accurately reflected in the appropriate system of record
  • Ensure quality and integrity of the software prior to it reaching production
  • Apply modern software development techniques for a modular system
  • Have an ability to learn new technologies as they are introduced, and the software applications and environment evolves
  • Support modernization of software development practices
  • Significant recent C# development experience.
  • 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.

Requirements

  • Experience as a developer in a software environment that supported more than 10,000 users and a Relational Database Management Systems (RDBMS) with more than 250 tables and 1 million total rows.
  • Experience in at least one software development environment with a minimum of 1,000 automated unit tests.
  • Recent development experience (at least 5+ years) with ASP.NET MVC based web development using Visual Studio..
  • Must have an Active Secret clearance in order to view, discuss, and handle classified data in support of applications.

Experience/Education

  • Minimum 15 years of web development experience.
  • Minimum 5 year of .Net Core/Standard development experience.
  • Minimum 10 years of ASP.Net C# MVC based web development experience using Visual Studio 2017 or higher.
  • Minimum 8 years of experience with Agile development methodologies including participation in Sprints, Backlog grooming, and Agile Ceremonies.
  • Bachelor’s degree in a related technical field, desired Nice to Have:
  • 5+ years of e-GIS experience, including:
  • Geolocation from addresses to Lat/Long.
  • Utilizing mapping software in a web context (e.g., Open Street Maps or similar).
  • Displaying and placing marking pins on satellite imagery.
  • Leveraging distance measurement tools on maps in a web browser.

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