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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior / Lead .NET Developer - **Company:** American IT Systems - **Location:** Lisle, IL, United States - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Clean Code Principles, ASP.NET, JavaScript (Programming Language), .NET Framework, Multitier Architecture, ADO.NET, Agile Methodology, Artificial Intelligence, Ajax (Programming Language), Software Applications, HTML5, Build Automation, Unit Testing, Microsoft Azure, Bootstrap (Software), Business Systems, C Sharp (Programming Language), Client Server Models, Cascading Style Sheets (CSS), Law Practice Management Software, Cloud Computing, Code Review, Databases, Continuous Integration, IBM DB2, Relational Databases, Database Development, Software Design Patterns, DevOps, Language Integrated Query, Entity Framework, Github, Internet Information Services (IIS), Windows Communication Foundation, JSON, JQuery, PostgreSQL, Microsoft Visual Studio, Microsoft Software, Microsoft SQL Server, Team Foundation Server, Visual Basic .NET (Programming Language), Windows Servers, Model View Controller (MVC), Object-Oriented Software Development, Oracle (Applications), Performance Tuning, Scrum Methodology, Query Optimization, Responsive Web Design, Microsoft SharePoint, Simple Object Access Protocol (SOAP), SoapUI, Software Engineering, SQL Stored Procedures, SQL Databases, Visual Studio Online, Web Applications, Web Services, Enterprise Software Applications, Postman, ReactJS, Technical Debt, Backend, AngularJS, Solid Principles, Information Technology, Integration Frameworks, Front End Software Development, SQL Server Management Studio (SSMS), Restful APIs, Software Version Control, Web Api - **Published:** September 12, 2026 - **Apply:** https://www.careerjet.com/jobad/us49e1a601fdca0373cc30c5983925d01d ## About the Role * 10+ years of professional software development experience, preferably with significant hands-on experience in the Microsoft technology stack. * Strong experience with C#, .NET Framework, ASP.NET, ASP.NET Core, MVC, Web API, ADO.NET, Entity Framework, WCF, and related technologies. * Experience developing and supporting N-tier, client/server, web-based, and service-oriented applications. * Strong database development skills with SQL Server, including query optimization, stored procedures, triggers, and performance tuning. * Experience with front-end development using HTML5, CSS, Bootstrap, JavaScript, jQuery, Angular, React, JSON, and AJAX. * Working knowledge of object-oriented programming principles, SOLID principles, design patterns, and clean coding practices. * Experience with source control, DevOps, and delivery tools such as Azure DevOps, GitHub, TFS, Visual Studio, VS Code, Postman, and SoapUI. * Ability to create technical design documents, use cases, test cases, deployment documentation, and user-facing documentation. * Strong analytical, troubleshooting, communication, and stakeholder-management skills., * Experience leading small development teams or coordinating work between onshore and offshore teams. * Experience with application modernization, legacy system remediation, technical debt reduction, and platform upgrades. * Experience integrating third-party services, AI-enabled services, transcript/document processing, or business workflow automation. * Experience in manufacturing, automotive, legal technology, industrial, or enterprise business systems environments. * Familiarity with Oracle, DB2, LiteDB, PostgreSQL, SharePoint, IIS, Windows Server, and cloud-oriented delivery practices. Education and Certifications * Bachelor's degree in Computer Science, Information Technology, Engineering, or a related field preferred; equivalent professional experience may be considered. * Advanced degree or formal computer applications education is a plus. * Relevant Microsoft, .NET, cloud, DevOps, database, or application development certifications are preferred. ## Description * Design, develop, test, deploy, and maintain enterprise applications using C#, ASP.NET, ASP.NET Core, MVC, Web API, and related Microsoft technologies. * Modernize legacy .NET applications and services to improve performance, reliability, maintainability, and user experience. * Build and consume RESTful APIs and web services to support integrations with internal and external systems. * Develop responsive user interfaces using HTML5, CSS, Bootstrap, JavaScript, jQuery, Angular, and React where applicable. * Create and optimize SQL queries, stored procedures, triggers, indexes, and database objects across SQL Server and other relational databases. * Participate in requirements gathering, analysis, technical design, solution estimation, documentation, testing, and implementation activities. * Support Agile delivery practices, including sprint planning, backlog refinement, code reviews, unit testing, and release coordination. * Provide production support, troubleshoot application issues, analyze root causes, and implement corrective actions. * Collaborate with business users, product owners, QA teams, infrastructure teams, and offshore/onshore development teams. * Contribute to CI/CD pipelines, source control practices, build automation, and deployment processes using tools such as Azure DevOps, GitHub, and TFS., C#, VB.NET, ASP.NET, ASP.NET Core, MVC, .NET Framework, LINQ, Entity Framework APIs and Services REST, SOAP, Web API, WCF, backend services, third-party integrations Front-End HTML5, CSS, Bootstrap, JavaScript, jQuery, Angular, React, AJAX, JSON Databases SQL Server, Oracle, DB2, PostgreSQL, LiteDB, stored procedures, triggers, query optimization DevOps and Tools Azure DevOps, GitHub, TFS, Visual Studio, VS Code, Postman, SoapUI, SSMS Delivery Practices Agile, Waterfall, CI/CD, code reviews, testing, production support, technical documentation ## Related Videos - [Navigating the Corporate Jungle: Life as a Developer in a large Company](https://www.wearedevelopers.com/videos/621-navigating-the-corporate-jungle-life-as-a-developer-in-a-large-company) - [Tips and Tricks for Working with JSON](https://www.wearedevelopers.com/videos/1229-tips-and-tricks-for-working-with-json) - [The Resilience of the World Wide Web](https://www.wearedevelopers.com/videos/1281-the-resilience-of-the-world-wide-web) - [You’re a great coder? That alone won’t get you far: The soft skills secret in IT success](https://www.wearedevelopers.com/videos/1076-you-re-a-great-coder-that-alone-won-t-get-you-far-the-soft-skills-secret-in-it-success) - [Introducing JSON Structure](https://www.wearedevelopers.com/videos/100219-introducing-json-structure) - [Can SVG be fast? 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