C# development company
We write C# on modern .NET for APIs, internal platforms and line-of-business software, and we move teams off .NET Framework, WCF and Web Forms without a big-bang rewrite that freezes the roadmap.
- Senior engineers · IST + EST overlap
- NDA on day 1
- 24-hour reply
- Projects shipped
- 50+
- Code ownership
- 100%
- Client rating
- 4.8/5
- First reply
- 24h
Modern .NET work, from greenfield to framework migrations
As a C# development company, Krapton builds ASP.NET Core services, Blazor and .NET MAUI applications, background workers and Azure integrations on the current .NET LTS line. C# suits teams that want one language across web APIs, desktop tools and cloud functions, with a compiler and analyzers that catch whole classes of mistakes before review. C# projects tend to fall into two groups: new products, where we default to minimal APIs or controllers, Entity Framework Core with explicit migrations, and OpenTelemetry from day one; and legacy estates on .NET Framework, where the job is to separate business logic from System.Web, replace WCF with gRPC or REST, and move projects to SDK-style builds one library at a time. Nullable reference types, async all the way down and Roslyn analyzers in CI are standard settings, not optional extras. You get the solution in your Azure DevOps or GitHub repository, with xUnit tests, Bicep or Terraform infrastructure, and deployment pipelines your team can run.
C# development services
ASP.NET Core API development
Minimal APIs or controller-based services with ASP.NET Core Identity or Microsoft Entra ID, rate limiting middleware, problem-details error responses and OpenAPI documents generated at build time.
.NET Framework migration
Porting ASP.NET MVC, WCF and Windows services to modern .NET with the .NET Upgrade Assistant, CoreWCF where SOAP contracts must stay, gRPC where they can change, and Blazor for Web Forms screens worth keeping.
Blazor and MAUI front ends
Blazor web apps using server, WebAssembly or auto render modes, and .NET MAUI clients for Windows, Android and iOS that share validation and domain models with the backend.
Entity Framework Core data layers
Schema design, EF Core migrations reviewed as SQL, compiled queries for hot paths, Dapper where hand-tuned SQL wins, and SQL Server or PostgreSQL indexing based on actual execution plans.
Azure cloud backends
Azure App Service, Container Apps and Azure Functions deployments, Service Bus messaging, Key Vault secrets and managed identities, defined in Bicep or Terraform so environments are reproducible.
Background jobs and messaging
Worker services, Hangfire or Quartz.NET schedules, and RabbitMQ consumers built with the transactional outbox pattern, so a failed database write does not leave orphaned messages behind.
Why teams choose Krapton for C#
Senior engineers, fixed scope, and code you own — the things agencies promise and rarely deliver.
Async code that holds up
We remove sync-over-async calls such as .Result and .Wait(), pass CancellationToken through every layer, and create HttpClient instances through IHttpClientFactory to avoid socket exhaustion under load.
Migrations that keep shipping
Framework-to-.NET ports run side by side using YARP as a reverse proxy, so migrated routes go live gradually while unmigrated pages keep serving users from the old application.
Licensing checked before adoption
Several popular .NET libraries have moved to commercial licenses. Dependencies are reviewed for license terms and maintenance status before they enter your solution, not after an audit flags them.
Testing beyond unit tests
xUnit suites are paired with WebApplicationFactory integration tests and Testcontainers databases, so routing, middleware, authorization policies and EF Core mappings are exercised the way production runs them.
How a C# project runs with Krapton
01
Solution and dependency review
We map projects, target frameworks, NuGet packages and Windows-only APIs, flagging what blocks a move to modern .NET and what can stay untouched.
02
Design and backlog cut
Bounded contexts, API contracts and data ownership are agreed first, then the backlog is cut into features small enough to demo within a sprint.
03
Gated pull requests
Every pull request runs dotnet build with analyzers, xUnit and integration tests, and a vulnerability check of NuGet dependencies before merge is allowed.
04
Deploy and observe
Slot swaps or blue-green releases on Azure, OpenTelemetry exported to Application Insights or Grafana, and a runbook covering scaling, secrets rotation and rollback.
The C# stack we build with
C# development: questions answered
When is C# the right language for a new product, and when is it not?
C# is a strong choice when your team already knows .NET, your organization runs on Microsoft 365, Azure or SQL Server, or you need one language for APIs, desktop tools and background services. It is weaker for products that depend on JavaScript-first ecosystems, data science work that lives in Python, or teams with no .NET experience to maintain the code. Unity game development also uses C#, but it is a separate skill set from business software.
Can a C# development company move us off .NET Framework without a full rewrite?
Yes, in most cases, by migrating incrementally. Class libraries are retargeted to .NET Standard or modern .NET first, then the web layer moves route by route behind YARP while the old ASP.NET application keeps serving the rest. WCF services move to CoreWCF if clients cannot change, or to gRPC if they can. Web Forms has no direct port, so those screens are rebuilt in Blazor or Razor Pages, prioritized by usage.
Is Blazor ready for production, or should we pair .NET with React?
Blazor is production-ready and works well for internal tools, admin portals and line-of-business apps where the team writes C# end to end. React or another JavaScript framework is often the better pick for large consumer front ends, heavy client-side interactivity or teams with existing front-end specialists. Blazor WebAssembly has a larger initial download, so we choose server or auto render modes when first-load speed matters.
How do you handle .NET version upgrades and support lifecycles?
We plan upgrades around Microsoft’s support policy rather than reacting to end-of-support dates. LTS releases ship in alternate years with longer support, while STS releases have a shorter window, so most production systems belong on an LTS version. Upgrades start with the SDK and target framework, then analyzers surface breaking changes, and integration tests confirm behavior before the new runtime reaches production. A global.json file pins the SDK so builds stay reproducible.
What determines the cost of a C# development project?
There is no fixed figure; the estimate follows from a technical discovery. In C# work, the largest swing factor is legacy surface: how many .NET Framework projects, WCF endpoints and Web Forms pages must be preserved or ported. After that come third-party integrations, data migration, Azure services in scope, regulatory evidence such as HIPAA or GDPR controls, and whether you need a lead architect or only implementation engineers.
Ready to build? Tell us what you have in mind.
Send a short brief and a senior engineer will reply within one business day with next steps — no sales fluff.