.NET Development Company in the USA

.NET Development Services We Offer in the USA

Whether you're building a new product or maintaining a system that already runs your business, our .NET developers work as an extension of your team. We cover the full stack, from ASP.NET Core APIs to cloud-native deployment on AWS and Azure. See our full range of .NET development services for the complete picture.

Custom .NET Application Development

We design and build applications on C# and ASP.NET Core tailored to your business logic, not a generic template. Every solution is scoped around your workflows, data model, and integration requirements.

ASP.NET Web Development

Our engineers build web applications on ASP.NET Core and ASP.NET MVC, from customer-facing portals to internal tools that need to hold up under real production traffic.

.NET Enterprise Software Development

We build enterprise systems using .NET's mature ecosystem: Entity Framework for data access, MVVM and WPF for desktop tools where needed, and service-oriented patterns for systems that need to scale across departments.

.NET Migration and Modernization

We move legacy .NET Framework applications to .NET 8 or .NET 10, the current LTS releases, and restructure monolithic systems into modular architecture. In one recent engagement, we rebuilt a legacy finance platform on .NET 6, cutting development and release time by 30% while reducing infrastructure overhead. See our dedicated .NET application migration services for a closer look at how we approach these projects.

.NET API Development and Integration

We build REST and GraphQL APIs in ASP.NET Core that connect your .NET backend to mobile apps, front-end clients, and third-party services, with authentication and versioning built in from the start.

Cloud-Based .NET Development

Our .NET developers deploy and manage applications on AWS, Azure, and Google Cloud, using containerization (Docker, Kubernetes) and infrastructure as code (Terraform, CloudFormation) to keep environments consistent and deployments repeatable.

Dedicated .NET Developers

You can bring on dedicated .NET engineers who join your existing team and take part in sprint planning, code review, and delivery, without the overhead of a separate hiring process.

.NET Support and Maintenance

After launch, we handle bug fixes, security patches, dependency upgrades, and performance monitoring, so your system stays stable as your user base and feature set grow.

Why Choose Techstack as .NET Development Company in the USA

We've been building software for over 10 years, and 60% of our clients have worked with us for 5 or more years. Our engineers hold Microsoft .NET certifications alongside AWS, Google Cloud, and Scrum credentials, and our teams are rated 5.0 on Clutch.

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We take ownership of the outcome, not just the ticket. Our architects define the technical direction upfront, our QA function is built into delivery from day one, and our engineering leads stay accountable for the system after launch, not just the sprint.

.NET Solutions We Build

Web Applications

Customer-facing and internal web applications built on ASP.NET Core, designed for performance under real user load.

Enterprise Platforms

Multi-module systems that connect departments, data sources, and workflows into a single, maintainable platform.

SaaS Products

Multi-tenant SaaS applications with subscription billing, role-based access, and architecture built to scale with your user base.

CRM and ERP Systems

Custom CRM and ERP systems, or extensions to existing platforms, that match your actual sales, service, or operations process instead of forcing a workaround.

Fintech and Banking Software

Secure, compliant financial applications built with the audit trails, encryption, and transaction integrity that regulated environments require.

Healthcare Software

Patient management, records, and provider communication systems built with HIPAA compliance and data protection as core requirements, not an afterthought.

E-commerce Solutions

Storefronts, order management, and inventory systems on .NET, integrated with payment gateways and third-party logistics providers.

Legacy System Modernization

Phased modernization of older .NET Framework and monolithic systems, reducing technical debt without disrupting the business that depends on them. Read more about our legacy system modernization services.

Our .NET Technology Stack

We select the right tools for your specific system rather than defaulting to one stack for every project.

Languages and frameworks

• C#, F#
• ASP.NET Core, ASP.NET MVC, .NET Framework, .NET 8 and .NET 10 (current LTS releases)
• Entity Framework, Entity Framework Core
• MVVM, SignalR, WPF, WCF

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Data and caching

• SQL Server, PostgreSQL, MySQL
• Redis, Memcached, Elasticache
• AWS RDS, Aurora

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Cloud and DevOps

• Microsoft Azure, Amazon Web Services, Google Cloud Platform
• Docker, Kubernetes
• Terraform, AWS CloudFormation
• GitHub Actions, Jenkins, TeamCity, CircleCI

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Testing

• NUnit, xUnit.net
• Moq, Fluent Assertions

Industries We Serve in the USA

Fintech

Payment processing, digital banking, and wealth management platforms built with compliance and transaction security in mind.

Healthcare

Secure systems for patient records, telemedicine, and provider workflows, built for HIPAA compliance.

E-commerce

Storefronts and order management systems designed to hold up during peak traffic and integrate with existing logistics tools.

Logistics

Tracking, route optimization, and inventory systems that integrate with the software you already run.

Energy and Utilities

Asset monitoring, predictive maintenance, and grid data systems for energy and utility operators.

SaaS

Multi-tenant products architected to scale from first customers to enterprise accounts without a rebuild.

Manufacturing

Production tracking, quality control, and inventory systems that reduce manual work and technical debt.

Our .NET Development Process

Discovery and Requirements Analysis

We start by understanding your business goals, current systems, and constraints, so the technical plan matches what your product actually needs.

Architecture Planning

Our architects define the system design, data model, and integration points before development starts, so scaling decisions are made early, not retrofitted later.

UI/UX and Prototyping

Where a new interface is part of the scope, we validate flows and designs with prototypes before committing development time.

.NET Development

Our engineers build in structured sprints, with code review and continuous integration on every change.

QA and Testing

We test across unit, integration, and system levels using NUnit, xUnit, and automated pipelines, catching issues before they reach production.

Deployment

We manage controlled releases with monitoring and rollback plans in place, so launches don't put existing users at risk.

Ongoing Support

After launch, we monitor performance, patch dependencies, and provide the support your system needs as usage grows.

Engagement Models

Dedicated .NET Team

A full team assembled around your product, managed by Techstack, with the architecture, QA, and delivery cadence already in place.

Staff Augmentation

Individual .NET engineers who join your existing team under your management. You take part in candidate selection, and engagement can scale from 0.25 to 1.0 FTE.

Project-Based Development

A defined scope, timeline, and budget for a specific deliverable, from a new module to a full application build.

Long-Term Product Development

An ongoing partnership where our team grows and adapts alongside your product. 60% of our clients have worked with us for 5+ years.

Benefits of Hiring .NET Developers in the USA

• Faster delivery through Entity Framework, ASP.NET Core, and a mature .NET tooling ecosystem
• Lower long-term maintenance cost through strongly typed code and Microsoft's long-term support cycles
• Easier integration with existing Microsoft infrastructure, including Azure AD and Office 365
• A talent pool that includes Microsoft-certified engineers with production experience in regulated industries
• Architecture built to scale, so the system you launch with isn't the one you'll need to replace in two years

Our .NET Projects

Modernizing a legacy finance platform for better scalability and stability
Fintech, United States

We rebuilt a legacy finance application into a component-oriented architecture on .NET 6, making the system easier to scale, maintain, and evolve over time. This project is part of our broader legacy system modernization work.

• Monolith rebuilt into a modular system for easier scaling
• Migrated to .NET 6 for long-term support
• Unified execution across users and data
• 30% faster development and releases
• Reduced infrastructure costs and lower maintenance overhead

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Check out how we built it

What Our Clients Say

"Techstack Ltd kept the uptime and the customers happy. The team was highly competent, proactive, and efficient, excelling for their technical and thought leadership."

Clutch Review — Mark Beare, Former VP of Research & Development, Corel Corporation

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"What I liked most about working with Techstack was their seamless teamwork and deep technical competence. Their experience in building world-class apps was evident in every phase of development, from ideation to execution. They collaborated with our team effortlessly, feeling like an extension of our own staff."

GoodFirms Review — John Busch, Founder & CEO at ILIAD

Ready to Start Your .NET Development Project?

We'll assess your system and give you a clear plan before any development begins. Start with a free consultation and a written scope estimate.

Book a free consultation →