.NET Application Modernization Consultant – Senior / Lead

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🕒 2 days ago

🦀 Maryland, Virginia – Remote

🦀 Maryland – Remote ⚔️ Virginia – Remote

⏳ Contract/Temporary

🟠 Senior

🔙 Backend Engineer

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HIKINEX

WebsiteLinkedInAll Job Openings

201 - 500 employees

🤝 B2B

🎯 Recruiter

B2B • Recruitment

HIKINEX is a multi-channel integrated service provider that delivers outsourced sales, recruitment, virtual assistant, and marketing support to help companies scale quickly and reduce operating costs. The company offers sales-as-a-service (appointment setting, outbound sales, sales training), end-to-end recruiting and talent acquisition (sourcing, screening, ATS management, executive recruiting), virtual administrative support, and marketing/brand ambassador services. HIKINEX operates remotely out of San Francisco and emphasizes flexible, scalable staffing and operations solutions for B2B clients.

📋 Description

• 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 • 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

🏖️ 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)