> Markdown version of [/jobs/ext/4589483-senior-c-net-developer](https://www.wearedevelopers.com/jobs/ext/4589483-senior-c-net-developer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior C#/.NET Developer - **Company:** Green Key Resources - **Location:** Mundelein, IL, United States - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** .NET Framework, Automation of Tests, Microsoft Azure, C Sharp (Programming Language), Object-Oriented Software Development, Secure Coding, Software Engineering, Software Troubleshooting, Information Technology - **Published:** November 5, 2026 - **Apply:** https://www.thejobnetwork.com/job/5974f5f4-8e25-4cba-8d87-c2b43b7ce177/senior-cnet-developer ## About the Role * Bachelor's degree in computer science, engineering, or a related field. \n * Minimum of 5 years of professional software development experience; 10 years preferred. \n * Expertise in C#, .NET Framework, and modern .NET development. \n * Proficiency in SQL Server, including query development and performance troubleshooting. \n * Practical experience with Azure DevOps, CI/CD pipelines, and software change controls. \n * Knowledge of object-oriented design, secure coding, and automated testing. \n * Experience in financial services or capital markets preferred. \n * Strong communication skills and ability to work collaboratively with stakeholders. \n