.NET Application Modernization Consultant – Senior / Lead

Role Overview

• Lead the .NET Framework to .NET 8+ modernization strategy across the workstream
• Establish technical standards, migration patterns, and quality expectations
• Make and document key architectural decisions regarding: Distributed transaction modernization (DTC replacement strategies), ASP.NET Web Forms migration approaches, WPF application disposition (retire, retain on Windows, or rewrite)
• Perform hands-on modernization of the most complex application components
• Lead remediation of incompatible NuGet dependencies and package modernization efforts
• Reverse-engineer and replace private packages where source code is unavailable
• Review and approve modernization work completed by staff consultants
• Ensure functional parity, maintainability, and performance of migrated applications
• Evaluate where modernization tooling can accelerate delivery versus where manual intervention is required
• Partner with delivery leadership to identify risks, dependencies, and mitigation strategies

Requirements

• Core .NET Modernization Expertise
• Expert-level C# development experience using modern language features
• Extensive hands-on experience migrating applications from: .NET Framework, .NET Core, .NET 6 / 7 / 8
• Deep understanding of runtime and Base Class Library (BCL) differences between framework versions
• Project & Solution Modernization Experience converting: Legacy project formats to SDK-style projects, packages.config to PackageReference, Legacy solutions to multi-targeted architectures
• Strong understanding of: Target Framework Monikers (TFMs), .NET Standard, Shared library modernization
• Configuration Modernization Experience migrating: web.config, app.config, ConfigurationManager
• To: IConfiguration, appsettings.json, Options Pattern
• ASP.NET Modernization Extensive experience migrating: ASP.NET MVC, ASP.NET Web API
• To: ASP.NET Core, Kestrel, ASP.NET Core Middleware Pipeline
• Experience replacing legacy dependency injection frameworks
• Strong understanding of: Global.asax to Program.cs migration, Startup modernization, HttpContext API changes
• Legacy API & Framework Remediation Experience modernizing or replacing: BinaryFormatter, .NET Remoting, AppDomain-based implementations
• Specialized Modernization Challenges\n
• Distributed Transactions & DTC Modernization Experience redesigning TransactionScope and MSDTC-based systems
• Strong understanding of: Saga patterns, Outbox patterns, Idempotency, Eventual consistency
• ASP.NET Web Forms Modernization Experience migrating or rewriting Web Forms applications using: Razor Pages, ASP.NET MVC, Blazor
• WPF Modernization Experience assessing modernization strategies for WPF applications
• Ability to evaluate options including: Retention on Windows, Migration to web technologies, Avalonia, .NET MAUI
• NuGet & Dependency Modernization Experience replacing unsupported or incompatible NuGet packages
• Ability to analyze and reverse-engineer private package dependencies when source code is unavailable
• T4 Template Modernization Experience converting T4-based solutions to: Roslyn, Source Generators, Mono.TextTemplating
• Tooling & Delivery Experience Hands-on experience with: .NET Upgrade Assistant, AWS Porting Assistant for .NET, try-convert, .NET API Portability Analyzer (apiport), Git, Azure DevOps, GitHub Actions, Automated build, test, and deployment pipelines
• Additional experience with: Linux-targeted .NET workloads, Containerization concepts and deployment considerations

Tech Stack

• ASP.NET
• AWS
• Azure
• Linux
• WPF
• .NET

Benefits

• Important Screening Requirements
• Must be U.S. Citizens or U.S. Permanent Residents (Green Card holders) and able to work in the United States without current or future visa sponsorship
• Undergo fingerprinting as part of the onboarding process
• Successfully complete a government background investigation (CJIS-type clearance)