Senior .NET Modernization & Refactor Engineer

MMD Services, Inc.; Glenview (IL); On-site; USD 90,000 - 140,000; Full time

Job summary

MMD Services, Inc. is seeking a hands-on .NET developer to modernize and consolidate a large portfolio of legacy business applications.

You will work in a mature C# and SQL Server environment, refactoring code and taking part in design reviews, CI/CD, and knowledge transfer. The role is an individual contributor position requiring 5+ years of C#/.NET experience and ERP integration exposure; you will collaborate with business users and IT to deliver working solutions using AI-assisted coding

Qualifications

• Bachelor's degree in CS, software engineering, IT, or related field.
• 5+ years of professional software development with C# and .NET (Framework and .NET Core).
• Strong SQL Server skills, including T-SQL, stored procedures, and performance tuning.
• Experience with ASP.NET MVC or ASP.NET Core, Web API, REST, Git, and CI/CD pipelines.
• Hands-on experience modernizing, rewriting, or consolidating legacy applications.
• Regular use of AI-assisted coding tools in professional development work.
• Exposure to ERP integrations (Infor M3 a plus), Power BI, Snowflake, or Azure is a plus.

Responsibilities

• Build, enhance, and support C# and .NET applications used across business and manufacturing operations.
• Refactor and consolidate legacy applications, reducing duplicate functionality and simplifying integrations between systems.
• Work through existing code with limited documentation, map dependencies, and document how applications work.
• Write and tune SQL Server queries, stored procedures, and data integrations, including data sourced from the company ERP.
• Use AI-assisted coding tools such as GitHub Copilot, Claude Code, or Cursor in daily development, and help set good practices for the team.
• Take part in design and code reviews, and contribute to coding standards, testing, and CI/CD.
• Work with business users and the IT team to gather requirements and turn requests into working solutions.
• Collaborate with outside development partners on shared codebases and knowledge transfer.

Skills

C# and .NET

SQL Server

ASP.NET MVC

Web API

CI/CD

Education

Bachelor's degree in CS/IS

Tools

Git

Azure

Job description

MMD Services, Inc. is seeking a hands-on .NET developer to modernize and consolidate a large portfolio of legacy business applications.

You will work in a mature C# and SQL Server environment, refactoring code and taking part in design reviews, CI/CD, and knowledge transfer. The role is an individual contributor position requiring 5+ years of C#/.NET experience and ERP integration exposure; you will collaborate with business users and IT to deliver working solutions using AI-assisted coding