Senior .NET Developer

Location: Harrisburg, PA
Position Type: Mostly Remote
Hybrid Schedule: Mostly remote role, must come onsite to pick up equipment
Contract Length: Ongoing Contract with Yearly Renewals

Position Overview:
The Senior Software Developer provides hands-on development support for enterprise application modernization, working across legacy ASP.NET MVC applications and modern .NET 8-based solutions. This role requires immediate productivity in complex, regulated environments while contributing to incremental, low-risk modernization initiatives.

Duties:

• Design, develop, and maintain modern .NET 8 solutions using ASP.NET Core Web APIs and Blazor (Server and/or WebAssembly).
• Enhance and support legacy ASP.NET MVC applications built on .NET Framework 4.x.
• Build reusable Razor components, shared libraries, and scalable service layers.
• Develop responsive, accessible user interfaces compliant with ADA and WCAG standards.
• Ensure interoperability between new services and existing legacy systems.
• Collaborate within Agile/Scrum teams, participating in sprint planning, backlog refinement, and technical reviews.
• Partner with architects and senior technical staff on implementation and design decisions.
• Provide accurate effort estimates and meet contractual delivery commitments.
• Develop API-based and file-based integrations with internal systems and approved third-party services.
• Implement background processing using scheduled jobs, hosted services, and Windows or cloud-hosted services.
• Design, optimize, and maintain SQL Server schemas, queries, and stored procedures.
• Implement data access using Entity Framework 6 and Entity Framework Core.
• Ensure transactional integrity, auditing, and compliance with data retention requirements.
• Implement claims-based authentication and enforce role-, title-, and action-based authorization.
• Apply secure coding practices and properly handle sensitive and confidential data.
• Implement logging, monitoring, and diagnostics using Application Insights or equivalent tools.

Required Skills:

• 8+ years of professional software development experience delivering enterprise applications.
• 5+ years of hands-on experience with ASP.NET MVC using .NET Framework 4.x.
• 3+ years of hands-on experience with ASP.NET Core and modern .NET (.NET 6+ / .NET 8).
• Experience developing in C# within layered or N-tier architectures.
• Experience designing and consuming RESTful APIs.
• Experience with SQL Server, including relational data modeling and query optimization.
• Experience using Entity Framework 6 and Entity Framework Core.
• Experience building Razor Views and Razor Components.
• Experience with HTML5, CSS3, JavaScript, and jQuery for legacy application support.
• Experience with Blazor.
• Demonstrated experience implementing claims-based authentication and fine-grained authorization models.
• Proven ability to deliver independently with minimal onboarding in complex codebases.
• Hands-on experience using Azure DevOps, Git, and Visual Studio 2022.
• Demonstrated success delivering outcomes in long-term contract engagements.

Preferred Skills:

• Experience modernizing long-lived, enterprise-scale applications.
• Prior experience working in government or highly regulated environments.
• Hands-on exposure to Azure App Services and Azure SQL.
• Experience implementing or managing Azure API Management.
• Experience with workflow engines such as Elsa or equivalent platforms.
• Strong ability to ramp up quickly in domain-heavy, legacy-modern hybrid systems.