Senior .NET Modernization Developer

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Senior .NET Modernization Developer#26-01394

Harrisburg, PARemoteContract

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Job Description

Job Overview

The Senior Software Developer (Contractor) will provide hands-on development services supporting a modernization initiative, working on modern .NET 8/10 Blazor and MVC based solutions. This is a delivery-oriented role requiring contractors who can be immediately productive in existing enterprise codebases while contributing to incremental, low-risk modernization efforts in a regulated government environment.

Scope of Services

Modern Application Development

• Develop .NET 8/10 solutions using ASP.NET Core Web APIs and Blazor (Server and/or WebAssembly).
• Maintain and Enhance .NET 8/10 solutions using ASP.NET Core Web APIs and MVC.
• Build reusable Razor components and shared libraries.
• Implement responsive, accessible user interfaces compliant with ADA / WCAG standards.
• Ensure new services can be safely consumed by both new and legacy systems.

Collaboration & Delivery

• Work within Agile/Scrum teams.
• Participate in sprint planning, backlog refinement, and technical reviews.
• Collaborate closely with architects and senior technical staff on implementation decisions.
• Provide accurate estimates and meet contractual delivery commitments.

Integration & Background Processing

• Develop integrations with internal enterprise systems and approved third-party services.
• Implement API-based and file-based integrations.
• Develop background processing using:
• Scheduled jobs
• Hosted services
• Azure-hosted Worker Services (Docker)

Data & Persistence

• Implement data access using Entity Framework Core.
• Design and optimize SQL Server schemas, queries, and stored procedures.
• Ensure transactional integrity, auditing, and compliance with data retention rules.

Security & Compliance

• Implement claims-based authentication and authorization.
• Enforce role-, title-, and action-based access controls.
• Follow secure coding standards appropriate for government-regulated systems.
• Properly handle sensitive and confidential data (PII, investigative information).

Collaboration & Delivery

• Work within Agile/Scrum teams.
• Participate in sprint planning, backlog refinement, and technical reviews.
• Collaborate closely with architects and senior technical staff on implementation decisions.
• Provide accurate estimates and meet contractual delivery commitments.

Required Technical Expertise

Core Platforms

• C#
• ASP.NET Core MVC
• ASP.NET Core / .NET 8/10
• Blazor (Server and/or WebAssembly)

Front-End

• Razor Views and Razor Components
• HTML5 / CSS3
• JavaScript and jQuery (required for MVC applications)
• Responsive design principles
• ADA / accessibility compliance

Data & ORM

• SQL Server
• Entity Framework Core
• Relational data modeling and query optimization

Architecture & Patterns

• Layered / N-Tier architecture
• Repository and Specification patterns
• Dependency Injection
• RESTful API design
• Experience bridging legacy applications and modern services

Integration & Tooling

• REST and file-based system integrations
• Background jobs and schedulers
• Azure DevOps (Repos, Pipelines, Boards)
• Git
• Visual Studio 2022/2026
• Application logging and diagnostics (Application Insights or equivalent)
• Docker Desktop

Preferred Contractor Qualifications

• Experience modernizing long-lived enterprise systems
• Prior government or regulated-industry experience
• Azure App Services and Azure SQL exposure
• Azure API Management experience
• Elsa Workflows or equivalent
• Ability to ramp up quickly in complex, domain-heavy codebases

Experience Requirements

• 8+ years professional software development experience
• 5+ years ASP.NET Core / modern .NET
• Demonstrated success in long-term contract engagements
• Proven ability to deliver with minimal onboarding