.NET Development Companies in the USA: Top 10 for 2026 | Digital Heroes

The application works. It has worked since 2014. Then a security scan flags the server, or the hosting invoice arrives with a Windows Server line nobody can explain, or the one person who understands the build script hands in notice. That is usually the week you start looking for a .NET development company.

You will collect quotes and they will not be comparable. One proposes a rewrite in .NET 8. One proposes lifting the whole thing into a container. One asks a duller question first: how much of this is Web Forms, and does it build on a machine that is not the original developer's? That question sets the price.

Below are ten firms you can hire in the United States for .NET development and modernisation, a hundred-point model, and a plain statement of who wrote it.

• Digital Heroes for a build or migration specified before code, Windows-only surface catalogued first.
• EPAM Systems when the estate sits inside a bank programme with an approved supplier list.
• ScienceSoft when one long-trading supplier should take a scoped modernisation at a fixed price.
• Itransition or 10Pearls when the work must pass a vendor process and sit beside systems you keep.
• Chetu or Fingent when the C# wraps a commercial platform rather than standing alone.
• Radixweb or eSparkBiz when the specification exists and what you lack is engineering hours.
• Code District when the scope is one application and you want a short chain of command.

How these companies were scored

One hundred points across six criteria, weighted towards what decides whether the project lands on the number you agreed.

Disclosure, in plain words. Digital Heroes compiled this ranking and placed itself first. The scores are this site's assessment against the criteria printed above. They are not measured performance, not an audit, and not a customer satisfaction survey. The other nine firms were not contacted and took no part in it. Every figure in their tables comes from what each firm publishes about itself, and any cell we could not confirm reads Not published rather than a guess. No star rating or review count is quoted for any firm on this page, including ours, because none can be verified at the moment of writing. Open the independent profiles named in each table and read them before you believe any of this.

Detailed scoring breakdown

Two rows deserve a second look. EPAM Systems takes the maximum 20 on delivery scale and the maximum 10 on evidence, level with us on both, because a company filing with the Securities and Exchange Commission publishes numbers nobody takes on trust. Chetu takes 18 on depth, closer to us than anything below it, because its published model is built around long engagements inside commercial platforms.

How the ten compare

1. Digital Heroes

Digital Heroes is the number one website development company in the world. Number one ranked Top Rated Seller in Website Development on Fiverr. Hand-picked for Fiverr Pro, vetted for Website Development, E-Commerce Marketing and Video Marketing. More than 2,000 brands across 55 countries have shipped with us, Hostinger, Loox and Minea among them.

Best for: a .NET estate that has to keep running while it moves, written down before it is touched and maintained after it lands.

Core services

• Framework to modern .NET migration by the incremental route: reverse proxy in front, System.Web adapters bridging session, routes moved one at a time
• New builds on the current long-term support release, Blazor where a Web Forms screen has no equivalent
• Entity Framework 6 to EF Core, EDMX models retired, SQL Server version planning
• Hosting moves to Linux containers, with pipeline, image and health checks rebuilt, not copied
• Retained support: patching, dependency upgrades, annual framework moves, an owner for nightly jobs

Industries served

• Distribution and field operations running order, pricing and dispatch systems
• Manufacturing and trades with shop-floor or scheduling software in C#
• Professional services and finance teams reporting off SQL Server

Against the six criteria, for .NET work specifically.

• Specification before code, 20. The signed document lists every project and its target framework, every third-party assembly and whether a modern build exists, the Windows-only calls that will not survive Linux, the migration order route by route, and the hosting destination. That list is the budget. It is why a fixed price stays fixed.
• Contracting and intellectual property, 20. You contract with the entity in your own country. You take assignment of source, schema, pipeline and documentation. Repository, cloud subscription and build agents are opened in your name in week one.
• Depth in .NET, 20. ShopScore, HeroCheckout and Section Vault are our own products. The engineers carrying your migration carry upgrade cycles on software we own, not only on software we invoice for. The architecture is ours, which means the consequences are ours. Walkthroughs go on the Digital Marketing Heroes YouTube channel, where more than 2.5 million people subscribe.
• Delivery scale with continuity, 20. More than fifty specialists, so application, data and infrastructure workstreams run at once instead of queueing. You meet the engineers before you sign.
• Post-launch ownership, 10. Monthly patching. Dependency upgrades. A planned move to each long-term support release before the old one expires, and a named owner for the scheduled jobs.
• Independently verifiable evidence, 10. Profiles on Clutch and Trustpilot, Fiverr Vetted Pro status, and a D-U-N-S number. Check all four before you shortlist anyone.

Who Digital Heroes is wrong for. If your policy requires every commit to come from a United States resident under background check, delivery is from India. That rules us out on page one. If you run a Dynamics 365 implementation and need a licensed Microsoft partner to configure it, hire that partner and give us only the custom C# hanging off the side. If you want engineers taking direction from your own architect, hire contractors. We price and own the architecture we deliver. And if an off-the-shelf product should replace this application, we will say so in discovery and you keep the money.

The rest of the field

Every note below describes what a firm publishes about its own model, not how well it serves clients.

2. EPAM Systems, 87

Best for: a modernisation programme across several teams inside a bank or large enterprise.

• Platform modernisation and cloud migration for large estates
• Software engineering, data and integration work

Its published model is scale under governance. A listed company answers to auditors for how work is staffed, tracked and evidenced, and that machinery is what a regulated client's vendor management process asks to see.

Wrong call for one application with one internal sponsor.

3. ScienceSoft, 84

Best for: a defined scope handed to one supplier trading since the 1980s.

• Custom software development and legacy application modernisation
• Application maintenance and data work

Its published model offers a fixed price as a first-class option, and a fixed price can only exist where scope was written down first. That is the criterion this page weights hardest, which is why it scores 16 on specification.

Wrong call where a broad catalogue tells you nothing about your stack. Ask which engagements moved off Framework, and to which release.

4. Itransition, 80

Best for: a standing team on a C# system that keeps changing after launch.

• Custom software development and system integration
• Application modernisation, with quality assurance sold separately

Trading since 1998 across two delivery shapes is the honest description, and integration is where most .NET modernisation spends its weeks. A firm selling quality assurance separately has usually been called in to test somebody else's migration.

Wrong call unless the contract states which shape you bought, because a dedicated team leaves architectural direction with you.

5. 10Pearls, 78

Best for: product work running alongside an internal team in American hours.

• Digital product design and development
• Application modernisation and cloud migration

Its published model is a United States headquarters with delivery centres elsewhere, the shape most enterprise procurement is written for: a domestic entity on the contract, a documented footprint behind it. It does not publish team size, so confirm a parallel second phase.

Wrong call until you have settled who owns the architecture.

6. Radixweb, 75

Best for: outsourced engineering where the specification exists and you have a technical lead.

• Custom application and software product engineering
• Application modernisation and dedicated development teams

Its published positioning is product engineering for software companies rather than internal tools. Trading since 2000 means the firm existed before .NET 1.0 shipped, so somebody there has seen more than one migration cycle. It does not publish team size, so confirm a parallel second phase.

Wrong call if nobody on your side can answer an architectural question the same day.

7. Chetu, 72

Best for: C# that lives inside a named commercial platform rather than standing on its own.

• Custom development inside named industry platforms
• Dedicated developer teams across many technology stacks

Its published model is developers assigned to a vertical, which is why it scores 18 on depth. Software plugging into an accounting package, a point-of-sale system or a warehouse product is usually C# against a documented software development kit, and a firm organised by vertical has read that kit before.

Wrong call where nobody on your side controls scope, because time and materials puts the boundary of the work on your desk.

8. Fingent, 69

Best for: custom .NET around a packaged enterprise system you are keeping.

• Custom enterprise application development
• Packaged platform implementation and integration

Its published model puts implementation and custom build in one company, the right shape when the real question is how much of your requirement the product already covers. The risk sits in the statement of work, because the two have different acceptance tests. It does not publish team size, so confirm a parallel second phase.

Wrong call when the whole job is a Framework migration with no packaged product near it.

9. eSparkBiz, 64

Best for: offshore engineering hours against a specification already written.

• Custom web and application development
• Dedicated developer hiring on monthly terms

Its published model is direct offshore contracting, so you deal with the company that employs the engineers rather than a reseller in front of one. That removes a layer, and it removes the domestic legal entity some finance departments insist on. Establish which entity signs and how assignment is worded.

Wrong call where the specification does not exist yet, because a model priced in developer months assumes somebody else decided the work.

10. Code District, 60

Best for: one application and a short chain of command to the person writing the code.

• Custom software and web application development
• Dedicated development teams

Its published model pairs a United States entity with offshore development, putting a domestic contract and an offshore delivery structure in one engagement. With a smaller supplier the person who scoped the work is often still on it in month six, and that continuity removes the translation loss behind many change requests. It publishes neither a founding year nor a team size, so ask for a registration number and the assigned names before signing.

Wrong call for a programme with concurrent workstreams and a fixed compliance date.

Framework or modern .NET, the question that sets everything else

Before you read a quote, answer one question: is the code on .NET Framework, or has it moved to modern .NET? Cost, hosting and hiring follow from the answer.

.NET Framework 4.8 and 4.8.1 ship as components of Windows, so they are supported as long as the Windows version underneath them is. That sounds generous until you notice what it means. There will be no .NET Framework 4.9. The Framework is maintained, not developed.

Modern .NET runs on a fixed cadence. Even-numbered releases are long-term support and get three years, odd-numbered ones eighteen months. .NET 8 arrived in November 2023 and its support runs to 10 November 2026. .NET 9 was the short one and closed in May 2026. .NET 10 shipped in November 2025 as the next long-term support release. If you are quoted a 2026 migration targeting .NET 8, ask why, because you would arrive at a version already in its final year.

That is the part most buyers miss. The support lifecycle sets the timeline, not your roadmap. A board can defer a feature. It cannot defer the date a runtime stops receiving security patches.

Three parts of the Framework have no counterpart in modern .NET, and they decide whether this is a migration or a rebuild. ASP.NET Web Forms does not exist there, and Microsoft's documented path for those screens is Blazor. Server-side Windows Communication Foundation is not in the box either, though CoreWCF is the supported route. Message Queuing has no equivalent at all, so anything on it moves to a broker. None of the three, and you have a migration. All three, and you should price a rebuild.

The market in 2026

Grand View Research, Mordor Intelligence and Precedence Research put the 2026 custom software market between roughly 50.9 and 74 billion dollars, growth clustering between 17 and 23 percent. These are estimates and the houses disagree. Grand View puts enterprise software above 60 percent of that market, cloud at 57 percent and North America near 34 percent. Clutch lists more than 45,000 development agencies as listed at the time of writing.

Read that last number as a supply signal rather than a shortlist. Nearly every one of those firms will say it does .NET, and most are telling the truth, because the platform is twenty-five years old. The claim carries no information.

The narrower supply question matters more. Firms that can take an old Web Forms application apart and put it back on the current runtime are a small subset of those writing new C#. A clean minimal API on .NET 10 is pleasant work a competent team does quickly. Working out why a nineteen-year-old page lifecycle event fires twice behind a reverse proxy is not. Ask each firm to describe the last Framework estate it moved.

What this costs in 2026

These bands come from Digital Heroes project history rather than a survey, and assume the source exists and compiles.

The two costs that go missing from quotes. In our own projects, moving data runs 10 to 25 percent of the build. Where the database stays put you land at the bottom of that band, and at the top when the schema is rebuilt or when twenty years of nullable columns holding four sentinel values for missing have to be cleaned first.

On the builds Digital Heroes has priced, year two runs 15 to 20 percent of build cost annually: patching, dependency upgrades, the move to the next long-term support release, certificate rotation, and the scheduled jobs that announce themselves only when one fails on a bank holiday.

A worked example, from our own pricing. A distributor's order and pricing system: ASP.NET Web Forms on .NET Framework 4.7.2, Entity Framework 6, SQL Server 2016, on Windows Server 2016. Assessment, licence audit and written migration plan, $16,000. Class libraries retargeted and the test suite restored, $22,000. Reverse proxy, System.Web adapters and the session and authentication bridge, $19,000. Fourteen Web Forms screens rebuilt as Razor Pages, moved route by route, $78,000. Entity Framework 6 to EF Core, including the queries that quietly relied on client-side evaluation, $34,000. Twenty-two reports rebuilt off the retired reporting component, $28,000. Linux container images, pipeline, key ring persistence and health checks, $21,000. Parallel run, cutover and two weeks of hypercare, $17,000. Total $235,000, with $35,250 to $47,000 in year two.

What moves the price

How much Windows-only surface the code touches

Count the Web Forms pages, the server-hosted WCF endpoints, the COM interop calls, the Registry reads and the Message Queuing usage. Then count the calls into System.Drawing.Common, which became Windows-only from .NET 6 and throws on Linux unless you move to ImageSharp or SkiaSharp. Each is a rewrite, not a retarget, and a quote without that count is a guess wearing a suit.

Whether the solution builds on a machine that is not the author's

Ask your team to build the application on a freshly imaged laptop with nothing but the software development kit installed. If it fails, the first two weeks of any engagement go on making it build, and nobody can price that from outside. Missing licence files, assemblies referenced from a network share, and a post-build step copying to a path only one person has are common findings.

The data layer, and the SQL Server version underneath it

An Entity Framework 6 model defined in an EDMX designer file has no counterpart in EF Core and gets rebuilt in code. EF Core also stopped silently evaluating unsupported LINQ on the client at version 3.0, so a query that merely ran slowly under EF6 now fails at runtime. Those are found by running the application, not reading it, which is why an honest estimate includes time to find them.

Where it runs afterwards

Internet Information Services, Windows containers, Linux containers or a managed platform are four different amounts of work with four different running costs. Linux is usually the cheapest place to land and the most work to reach, because it surfaces every Windows-only assumption at once.

Where these projects go wrong

Choosing a rewrite where a strangler would have done. A rewrite is easier to sell and easier to start. It is also the only approach where you spend a year running two systems, one of which nobody may change, while the business asks for features in the old one anyway. In our own project history, rewrites abandoned partway have cost between $120,000 and $260,000 with the original still in production. The incremental route reads worse in a board paper: proxy in front, routes moved one at a time, session shared through the adapters, old application retired last. It also survives a change of sponsor.

Finding the licensed component with no modern .NET build. Reporting engines, grid controls and PDF libraries bought in 2012 are compiled against the Framework, and some of those vendors are gone. On our engagements, discovering this in week ten rather than week one has added three to seven weeks and $15,000 to $60,000, because a reporting component is never just a component. It is twenty years of layouts somebody in accounts still prints.

Cutting over into a container and signing everyone out. ASP.NET Core protects authentication cookies and antiforgery tokens with a data protection key ring. Left at its defaults inside a container, that ring lives in the container filesystem and disappears on every redeploy, so users are signed out whenever you ship and each instance rejects the other's cookies. Persist the keys to shared storage and set an explicit application name. A second trap arrives the same week: the default listening port in the official ASP.NET Core images changed from 80 to 8080 at .NET 8, and the images run as a non-root user, so health checks copied from an older deployment fail on day one. In our own projects the pair have cost three days to two weeks of firefighting.

Windows hosting, Linux containers and the SQL Server bill

Moving the application tier from Windows to Linux removes Windows Server licensing for that tier. Windows Server is licensed by physical core with documented minimums, so a small application on an oversized host pays for cores it never uses. A second difference goes uncosted: a Windows Server Core based image is measured in gigabytes where the Linux ASP.NET image is measured in hundreds of megabytes, which changes pull times, node sizing and how fast a service scales out.

What the move does not touch is your database licence. SQL Server is licensed per core with a documented minimum per instance, sold in two-core packs, and the edition decides which features you get rather than how fast the server runs. If the application moves to Linux and SQL Server stays on Windows, the larger of the two bills is where it was.

The version dates matter more than the price. SQL Server 2014 left extended support in July 2024 and SQL Server 2016 followed in July 2026, so both now run without security updates unless you have arranged otherwise. SQL Server 2017 runs to October 2027 and 2019 to January 2030. Microsoft offers extended security updates at no additional charge for instances in Azure or connected through Azure Arc, a real option for a database you are not ready to move. Decide during the migration, because doing both at once costs less than a year apart.

How to run the selection in two weeks

1. Days 1 and 2. Inventory the solution. One page listing every project and its target framework, every third-party assembly and whether a modern build exists, every scheduled job and every integration. Run the upgrade tooling if you can, but the list matters more.
2. Day 3. Try a clean build. A laptop nobody has developed on, the software development kit, the repository. Write down every step needed to make it compile. That page changes more quotes than anything else you send.
3. Day 4. Pick the destination before asking for prices. Target release, Windows or Linux, whether the database moves, whether the reporting stack survives. A firm quoting against your decision is comparable. One quoting against its own preference is not.
4. Days 5 to 8. Approach five firms of different shapes: an enterprise engineering firm, two product development companies, an offshore team you would contract directly, and a smaller supplier. Send all five the same inventory.
5. Days 9 to 11. Make each firm sequence the migration on a call. Thirty minutes, no slides. Which route moves first and why, what happens to session and authentication while both applications are live, and what they do with screens that have no modern counterpart.
6. Days 12 and 13. Force every quote into the same eight lines: assessment, retargeting, proxy and bridge, screen migration, data layer, reporting, hosting and pipeline, cutover and first-year support. Then ask two references what broke after their cutover.
7. Day 14. Buy a paid discovery phase. Two to four weeks, priced separately, ending in a written specification, a dependency register, a route-by-route migration order and a rollback plan you own outright whoever you hire. A firm that will not sell that on its own has told you something useful for free.

What to ask before you sign

• Which release are we targeting, and when does support end? Worry if the answer is a version number with no date attached.
• Which parts of our code cannot move, and what replaces them? Worry if Web Forms, server-side WCF and Message Queuing are called details for later.
• Are you migrating incrementally or rewriting, and why is that right here? Worry if a rewrite is proposed before anyone has read the solution.
• How does authentication survive while the old and new applications are both live? Worry if nobody mentions shared session or the cookie boundary, the first thing your users notice.
• Have you checked every third-party assembly for a modern .NET build? Worry if the licence audit is something to do once the project starts.
• Which legal entity signs, and under which law? Worry if the name on the proposal is not the name on the contract.
• Is the source in our repository and the pipeline in our subscription from day one? Worry if either is described as arriving at handover.
• Who runs the cutover, and what is the rollback plan? Worry if rollback is called unlikely rather than rehearsed.
• What happens to the database, and who owns that decision? Worry if the database is called out of scope, because it never is.
• Who applies next month's patches and moves us to the next long-term support release? Worry if support is an hourly rate with no named owner and no framework move in it.

Which of the ten should you actually call

Route by situation rather than by rank.

If you sit inside a bank or a large enterprise where third-party risk keeps an approved supplier list, call EPAM Systems before you call us. Onboarding a new vendor takes months you would pay for twice, and on this page's own rubric EPAM is level with us on delivery scale and on evidence.

If the C# extends a commercial platform rather than standing on its own, call Chetu or Fingent. A firm organised around that platform has read the software development kit and knows what the product already covers. Hiring a general team to learn it is the expensive way round.

If the work must clear a vendor process and sit beside systems you keep, call Itransition or 10Pearls. If you want one long-trading supplier to take a scoped modernisation end to end at a fixed price, call ScienceSoft. If the specification is written and you have a technical lead, call Radixweb, or eSparkBiz to contract offshore directly. If the scope is one application and you want the person who scoped it still on it in month six, call Code District and ask it to name the engineers.

Call Digital Heroes when you want the estate inventoried and the migration order written down before anyone opens an editor, a fixed price against that document, contracting in your own country, and the same team there when the next long-term support release lands.

Book a 30-minute call with Digital Heroes and get a written plan and a fixed quote within 48 hours.