NET Developer - Legacy System Decommissioning (On-Site

We are seeking a skilled .NET Developer to support the decommissioning of a legacy adjudication system. This is a dual-focus role: roughly 60% application development and 40% system decommissioning., * Design, develop, and maintain applications using ASP.NET, Web Forms, Entity Framework, and Web APIs

• Build new web services and enhance existing applications
• Support system integrations, testing, and deployment
• Troubleshoot, optimize performance, and provide ongoing technical support
• Work with modern tech as needed: .NET Core / .NET 6+, RESTful APIs, microservices, AWS/Azure, React/Angular/Vue, Docker/Kubernetes, SQL Server/NoSQL/MongoDB

System Decommissioning (40%)

• Perform system inventory, dependency mapping, and impact analysis across integrated systems
• Decommission application code, APIs, and batch processes in a controlled manner
• Extract, archive, and/or migrate data per retention policies, with validation for data integrity
• Retire application services, middleware, infrastructure, and third-party components
• Develop decommissioning plans, runbooks, and validation documentation
• Execute testing and coordinated system shutdown with stakeholders

• 6+ years as a Programmer in .Net Development.
• C# - strong backend development with clean, maintainable, performant code
• ASP.NET MVC - building scalable web applications
• .NET Core - hands-on, cross-platform, high-performance development

Data & ORM

• Entity Framework (EF Core or EF 6) - Code First / Database First
• Proficient in LINQ, EF migrations, query optimization, and complex data relationships
• SQL Server 2019 - database design, optimized queries, stored procedures, performance tuning

Web Services

• RESTful APIs - design and consume using ASP.NET Core Web API
• SOAP web services, WSDL, and XML-based services

Frontend

• HTML5 / CSS3 - responsive UI development
• JavaScript (ES6+)
• Angular 8 - SPAs (components, directives, services, routing)

Reporting

• SSRS - interactive, parameterized reports in web apps
• Crystal Reports - design, generate, and embed reports

Architecture & Quality

• MVC architecture and design patterns (Repository, Factory, Singleton)
• Unit testing / TDD - XUnit, MSTest, or NUnit

DevOps & Security

• Git version control
• CI/CD - Azure DevOps, Jenkins, or GitLab CI
• Authentication/Authorization - OAuth, JWT, RBAC

Soft Skills

• Excellent verbal/written communication with diverse stakeholders
• Strong analytical and problem-solving abilities; a true team player __________________

Preferred (Nice-to-Have)

• Microservices architecture
• Performance optimization (frontend, backend, and database queries)
• Docker / Kubernetes containerization, * On-site presence is mandatory Monday-Friday at 66 John Street, NYC - local candidates strongly preferred
• Must pass fingerprint and criminal background checks (NY State DCJS + FBI) prior to award
• Must sign a non-disclosure agreement
• Must be legally authorized to work in the United States
• References required: at least three former or current clients for similar work

You will help retire a legacy Java-based system - including its services, databases, and infrastructure - while also designing, building, and maintaining modern .NET applications. This is a hands-on technical role requiring strong backend, database, and integration skills, plus the discipline to execute controlled system shutdowns with full documentation.