Senior ASP.NET/C# Engineer — Web Apps & APIs

Hillis-Carnes Engineering Associates; Sparks Corner (MD); Hybrid; USD 110,000 - 150,000; Full time

Benefits offered by this job

ESOP

Medical insurance

Dental insurance

Vision insurance

Life insurance

Long-term disability

401k with company match

Paid holidays

Generous PTO

Job summary

Hillis-Carnes Engineering Associates is seeking a Senior ASP.NET / C# Developer to design, build, and support business applications using Microsoft technologies in a hybrid work setting.

You will develop web apps with ASP.NET, C#, and SQL Server, while modernizing legacy Web Forms and MVC projects, building APIs, and writing efficient data-access code. Collaboration with users and teams will be essential to deliver secure, robust solutions.

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.

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.

Skills

C#

ASP.NET

SQL Server

WPF

JavaScript

HTML/CSS

jQuery

NET Core

REST APIs

AI-assisted tools

Education

Bachelor's degree in Computer Science or related field

Tools

ASP.NET Web Forms

MVC

Core API

Git

AI-assisted development tools

Job description

Hillis-Carnes Engineering Associates is seeking a Senior ASP.NET / C# Developer to design, build, and support business applications using Microsoft technologies in a hybrid work setting.

You will develop web apps with ASP.NET, C#, and SQL Server, while modernizing legacy Web Forms and MVC projects, building APIs, and writing efficient data-access code. Collaboration with users and teams will be essential to deliver secure, robust solutions.