.NET Development Company in USA

.NET Development Services We Offer in the USA

Techstack provides full-cycle .NET development services in the USA, covering new application builds, legacy modernization, and long-term staff augmentation. See our complete .NET development services across all engagement types.

As a Microsoft .NET development company and .NET development agency serving the United States, we're a trusted .NET development partner for ASP.NET Core development company projects and .NET application development in the USA.

Custom .NET Application Development

We build custom .NET applications tailored to your business logic, from internal tools to customer-facing platforms, using ASP.NET Core, C#, and Entity Framework.

ASP.NET Web Development

Our ASP.NET web development covers MVC and Razor-based applications, RESTful APIs, and modern front ends integrated with a .NET backend.

.NET Enterprise Software Development

We design enterprise-grade .NET software for complex workflows, multi-department operations, and systems built to scale with your organization.

.NET Migration and Modernization

We move legacy .NET Framework applications to .NET Core and .NET 6+ in controlled phases, preserving business logic while modernizing the architecture underneath it. See our .NET Application Migration Services and Legacy System Modernization Services for more detail.

.NET API Development and Integration

We build and integrate RESTful APIs on .NET, connecting your systems to third-party platforms, internal services, and partner integrations.

Cloud-Based .NET Development

Our .NET applications are built for AWS, Azure, or GCP, with CI/CD pipelines and infrastructure set up from day one.

Dedicated .NET Developers

We provide dedicated .NET developers who join your team under your management, giving you direct control over priorities and day-to-day work.

.NET Support and Maintenance

After launch, we provide ongoing .NET support: bug fixes, performance tuning, dependency updates, and monitoring to keep your system stable.

Why Choose Techstack as .NET Development Company in the USA

Our developers hold Microsoft .NET certifications alongside AWS and Google Cloud credentials. Techstack has spent 12+ years building and scaling .NET systems, ranked in the top 1% of US engineering functions, with 60% of clients staying with us for 5+ years and a 5.0 Clutch rating from clients including Bunking, ILIAD, and Corel Corporation. We're ISO 27001 and ISO 27701 certified and GDPR-compliant, with delivery experience in healthcare and fintech, and we've run serverless .NET architecture for 400,000+ daily users while cutting server costs 50% on a platform storing millions of photos.

.NET Solutions We Build

Web Applications

Responsive, scalable web applications built on ASP.NET Core, from customer portals to internal tools.

Enterprise Platforms

Enterprise .NET platforms that support multiple departments, complex permission structures, and high transaction volumes.

SaaS Products

Multitenant SaaS platforms on .NET, built with tenant isolation, subscription billing, and scalable infrastructure in mind.

CRM and ERP Systems

Custom CRM and ERP systems on .NET, integrated with your existing data sources and workflows.

Fintech and Banking Software

Secure, compliant .NET applications for financial planning, payments, and banking operations.

Healthcare Software

.NET systems for patient data, care coordination, and healthcare operations.

E-commerce Solutions

Scalable .NET e-commerce platforms with secure payment integrations and inventory management.

Legacy System Modernization

We modernize legacy .NET systems in phases, reducing risk while improving performance and maintainability. Learn more about our legacy system modernization services.

Our .NET Technology Stack

C#, F#, ASP.NET, ASP.NET Core, MVC, Entity Framework, WCF, SignalR, and WPF, deployed on AWS, Azure, or GCP with Docker, Kubernetes, and CI/CD pipelines built in from day one.

Industries We Serve in the USA

Fintech

Secure, compliant .NET systems for financial planning, payments, and banking operations.

Healthcare

.NET applications for patient engagement, care coordination, and healthcare data workflows.

E-commerce

Scalable .NET platforms for online retail, from storefronts to backend inventory systems.

Logistics

.NET systems for tracking, routing, and logistics operations that run around the clock.

Energy and Utilities

.NET applications for energy monitoring, grid management, and utility operations.

SaaS

Multitenant .NET platforms built for subscription-based software businesses.

Manufacturing

.NET systems for production tracking, quality control, and manufacturing operations.

Our .NET Development Process

Discovery and Requirements Analysis

We review your current .NET application, or your requirements for a new build, along with your team structure and technical constraints.

Architecture Planning

Our solution architects define the target architecture: framework version, data layer, hosting environment, and integration points.

UI/UX and Prototyping

For new builds, our design team creates user flows and prototypes before development starts.

.NET Development

Engineers build in sprints with regular code review, working against a shared backlog you can track throughout delivery.

QA and Testing

Every release goes through our internal QA process before deployment, covering functional, performance, and security testing.

Deployment

We manage controlled releases with rollback plans to avoid disrupting your live system.

Ongoing Support

After launch, we provide ongoing maintenance as your .NET application evolves.

Engagement Models

Dedicated .NET Team

A dedicated .NET team assembled for your project, working under our delivery management.

Staff Augmentation

.NET engineers who join your existing team under your management, filling specific skill gaps.

Project-Based Development

A defined .NET project delivered end to end, with a clear scope and timeline.

Long-Term Product Development

Ongoing .NET development as your product grows, with the same team maintaining context over time.

Benefits of Hiring .NET Developers in the USA

A dedicated .NET team gets you faster time to market, access to senior engineers without a lengthy hiring process, and lower long-term maintenance costs through clean architecture. Our Time & Materials engagement model means you pay for actual work completed, not a fixed estimate that doesn't match real effort.

Our .NET Projects

A fintech partner needed to modernize a legacy finance application without disrupting live operations. We rebuilt the system on .NET 6, moving from a monolith to a component-oriented architecture, cutting development and release time by 30%.

Read the full case study

Ready to start your .NET project in the USA?

Book a free discovery call and we'll map out the right approach for your system.