.NET development services from senior C# and Azure teams
Dedicated .NET teams that build ASP.NET Core services on Azure or AWS and move .NET Framework applications to modern .NET without stopping the business.
By the Ryz Labs team · Updated October 2026
Ryz Labs is a .NET development company that gives you a dedicated team of senior C# engineers to build ASP.NET Core APIs, Azure and AWS back ends and business applications, and to migrate .NET Framework systems to modern .NET. Every engineer is in the top 1% of the tens of thousands we have interviewed, and the team works on US business hours with same-day code review.
What we build
Most enterprise .NET work falls into two buckets: new services on modern .NET, and older .NET Framework applications that need to move. Our .NET teams do both.
- ASP.NET Core APIs: REST and gRPC services using minimal APIs or controllers, with Entra ID or OAuth 2.0 authentication, OpenAPI docs and versioning.
- .NET Framework to modern .NET migrations: ASP.NET MVC and Web API 2 apps moved to ASP.NET Core on a current LTS release, project by project, using incremental migration with YARP so old and new run side by side.
- Web Forms and WCF replacements: Web Forms has no direct port, so we rebuild screens in Blazor, Razor Pages or a React front end; WCF services move to CoreWCF, gRPC or REST.
- Azure back ends: services on Azure App Service, Container Apps or AKS, with Azure Functions, Service Bus, Cosmos DB, Azure SQL and Key Vault, deployed with Bicep or Terraform.
- Business and line-of-business applications: internal portals, workflow and approval systems, and reporting tools that replace spreadsheets and Access databases.
- Messaging and background processing: worker services with MassTransit or NServiceBus on Azure Service Bus or RabbitMQ, and scheduled jobs with Hangfire or Quartz.NET.
- Blazor applications: interactive web UIs written in C# for teams that want one language across front end and back end.
- AI features in .NET products: Azure OpenAI integrations with Semantic Kernel or the official SDKs, added to existing .NET applications. Larger AI builds run as a pod; see AI integration services.
How an engagement works
- Talk. A scoping call with your engineering lead about the application, its .NET versions, hosting (on-prem IIS, Azure, AWS), integrations and the outcome you need.
- Match. We propose a team scoped to your stack, such as senior C# and ASP.NET Core engineers plus an Azure DevOps engineer or QA automation engineer. You get a plan, a price and the names of the people.
- Join. The team starts in your Azure DevOps or GitHub repos, pipelines, environments and standups, with weekly demos.
- Grow. Add people or disciplines as scope grows, or hand the system to your team with runbooks and documentation.
Week 1 covers access, a working local build, and an inventory of projects, target frameworks, NuGet packages and Windows-only dependencies. Month 1 usually brings an agreed migration or architecture plan, CI that builds and tests every pull request, and the first change in production. By month 3, the team ships on your release cadence, migrated routes or services are taking real traffic, and monitoring covers both the old and new paths.
The stack our teams work in
| Layer | Tools we use | Notes |
|---|
| Runtime and language | .NET LTS releases (8, 10), C#, .NET Framework 4.x for legacy code | New work targets an LTS release; upgrades planned around Microsoft's support dates |
| Web and APIs | ASP.NET Core, minimal APIs, gRPC, SignalR, Blazor, Razor Pages, YARP | YARP for incremental migration from .NET Framework |
| Data | SQL Server, Azure SQL, PostgreSQL, Cosmos DB, Entity Framework Core, Dapper | EF Core migrations reviewed; Dapper for hot queries |
| Messaging and jobs | Azure Service Bus, RabbitMQ, MassTransit, NServiceBus, Hangfire | Outbox pattern for reliable publishing |
| Testing | xUnit, NUnit, FluentAssertions, Testcontainers, WebApplicationFactory, Playwright | Integration tests host the real API in memory |
| Cloud and DevOps | Azure (App Service, AKS, Functions, Key Vault), AWS, Azure DevOps, GitHub Actions, Bicep, Terraform | Infrastructure as code from the first environment |
| Observability | OpenTelemetry, Application Insights, Serilog, Seq, Datadog | Structured logs with correlation IDs |
How we keep .NET migrations and services on track
.NET projects tend to stall in the same places: a migration that tries to move everything at once, a data layer that is slow in ways nobody can see, and dependencies that only work on Windows. A senior team plans around them:
- Big-bang migrations. Rewriting a .NET Framework app in one go means months with nothing in production. We use incremental migration: YARP routes traffic to new ASP.NET Core endpoints while the rest stays on the old app, and shared session or auth bridges the two.
- Hidden Windows and Framework dependencies. System.Web, WCF clients, COM components, the GAC and registry reads don't come along. The .NET Upgrade Assistant and API compatibility analysis surface them in week one, before they surprise anyone.
- Support deadlines. Each .NET release has a published end-of-support date, and LTS releases get three years. We plan upgrades before those dates instead of after a security scan flags them.
- EF Core performance. Lazy loading, missing AsNoTracking on read paths, client-side evaluation and N+1 queries slow pages quietly. We log generated SQL in tests, use projections and split queries on purpose, and check execution plans in SQL Server.
- Async misuse. .Result and .Wait() on async calls cause thread-pool starvation and deadlocks under load. Analyzers flag them in CI, and we load-test with k6 or NBomber before launch.
- Unreliable messaging. Publishing an event after a database commit can lose messages. The outbox pattern in MassTransit or NServiceBus, idempotent consumers and dead-letter queues keep data consistent.
- Secrets in config files. Connection strings in web.config are common in older apps. They move to Key Vault or AWS Secrets Manager with managed identities, and code analysis plus dependency scanning run on every build.
Team shapes and cost
Typical Ryz pricing is $7,000 to $15,000 per engineer per month. Mid-level engineers (comparable to Amazon L5) cost $7,000 to $10,000; seniors (comparable to Amazon L6) cost $10,000 to $15,000; leads start at $15,000 and are quoted per team. Monthly cost is headcount times rate; project cost is team size times duration times monthly rate.
- Service team (a new ASP.NET Core API or an LTS upgrade): 2 senior .NET engineers. 2 × $10,000–$15,000 = $20,000–$30,000 per month.
- Migration team (a .NET Framework application moved to ASP.NET Core): 1 tech lead, 3 senior .NET engineers. $15,000+ for the lead plus 3 × $10,000–$15,000 = from about $45,000–$60,000 per month.
- Modernization program (several applications plus Azure infrastructure): 1 lead, 4 senior .NET engineers, 1 DevOps engineer and 1 QA automation engineer, quoted per team after scoping.
Quotes are scoped per team, and you get a plan, a price and the names of the people before you start.
Dedicated team or staff augmentation?
A dedicated development team fits when you want a scoped outcome delivered: a migration, a new service, a replacement for a line-of-business app. The team owns the plan and delivery and works with your engineers and the people who know the current system. For multi-application programs, see legacy application modernization.
Staff augmentation fits when your architects own the roadmap and need senior C# capacity. Then you hire .NET developers who work on your team, take tickets from your backlog and follow your conventions.
When Ryz isn't the right fit
If you need a few hours of help on a small fix, a self-serve freelance marketplace is quicker. If your .NET estate needs support coverage across European or Asian time zones, or follow-the-sun operations, a global network is a better match. And if you want a licensed low-code platform or a strategy engagement instead of engineers who write and ship the code, look at platform vendors or consultancies.
Related
FAQ
How much do .NET development services cost?
Ryz engineers typically cost $7,000 to $15,000 per engineer per month: $7,000 to $10,000 for mid-level, $10,000 to $15,000 for senior, and $15,000 and up for leads, quoted per team. Two senior .NET engineers are $20,000 to $30,000 per month. You get a scoped plan, a price and the names before work starts.
How fast can a .NET team start?
After the scoping call we propose a team with named engineers. Most of the timeline depends on scope and your onboarding: access to repos, Azure subscriptions or on-prem servers, and any security review. We don't promise a start date before we have seen those.
Can you migrate .NET Framework to .NET without a rewrite?
For ASP.NET MVC and Web API, mostly yes: much of the business logic ports with changes to hosting, configuration and dependencies. Web Forms screens and some WCF features have no direct equivalent and need rebuilding. We scope which parts port and which need new code before you commit.
Do you only work on Azure?
No. Azure is common for .NET, but our teams also run ASP.NET Core on AWS (ECS, Lambda, EKS) and on Linux containers anywhere. Moving off Windows servers and IIS is often part of the work.
Can the team build the front end too?
Yes. Depending on your stack, that is Blazor, Razor Pages, or a React or Angular front end; see Angular development services for enterprise front ends.
Questions we didn't answer? Email info@ryzlabs.com.