Senior ASP.NET / C# Developer Location: Sparks, MD / Annapolis Junction, MD Employment Type: Full-time Work Arrangement: Hybrid Hillis-Carnes Engineering Associates is seeking an experienced Senior ASP.NET / C# Developer to develop, enhance, and support business applications using Microsoft technologies. 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. Required Qualifications • 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. • Experience with WPF is a plus. • 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, ChatGPT for coding, debugging, testing, and documentation, with the 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. Preferred Qualifications • 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. Hillis-Carnes offers a comprehensive benefits package including Employee Stock Ownership Plan (ESOP), medical (with Health Savings Account Options), Dental, Vision, company-paid life and long-term disability, wellness incentives, generous PTO and paid holidays, 401k with company match, and much more! HCEA is an Equal Opportunity/Affirmative Action employer. Minorities and Women are encouraged to apply.