Senior ASP.NET / C# Developer

Hillis-Carnes•Sparks, MD

1d•Hybrid

About The Position

Hillis-Carnes Engineering Associates is seeking an experienced Senior ASP.NET / C# Developer to develop, enhance, and support business applications using Microsoft technologies. The position is full-time and hybrid, based in Sparks, MD or Annapolis Junction, MD. The developer will work on new and existing applications, including legacy ASP.NET Web Forms and MVC systems, and will collaborate with business users and technical teams to deliver solutions. The role also includes troubleshooting, participating in reviews and deployments, and following secure software-development practices.

Requirements

Bachelor's degree in Computer Science, Information Technology, or a related field, or equivalent professional experience.
Seven or more years of professional experience developing applications with C#, ASP.NET, and SQL Server.
Experience with ASP.NET Web Forms, MVC, .NET Core, and Core API.
Experience with RESTful APIs.
Strong SQL Server and database-development skills.
Proficiency with HTML, CSS, JavaScript, and jQuery.
Experience with Git or another source-control system.
Experience using AI-assisted development tools, such as GitHub Copilot, Claude Code, or ChatGPT, for coding, debugging, testing, and documentation, and ability to review AI-generated output for accuracy, security, and maintainability.
Strong troubleshooting, communication, and problem-solving skills.
Ability to work independently and as part of a team.
Must be legally authorized to work in the United States. Hillis-Carnes Engineering Associates cannot provide or assume employment-based visa sponsorship for this position now or in the future.

Nice To Haves

Experience with WPF.
Experience with DevOps, including IIS, SSL, Windows Server, and application deployment.
Experience with Telerik, Syncfusion, Microsoft Graph, or third-party system integrations.
Experience modernizing legacy business applications.

Responsibilities

Develop and maintain web applications using ASP.NET, C#, and SQL Server.
Support and modernize existing ASP.NET Web Forms and MVC applications.
Develop application features, APIs, integrations, reports, and internal tools.
Write and optimize SQL queries, stored procedures, and data-access code.
Troubleshoot application, database, and production issues.
Collaborate with business users and technical teams to define and implement solutions.
Participate in code reviews, testing, deployment, and technical documentation.
Follow secure coding and software-development best practices.