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Top IT Service Providers for .NET in the USA

3 of 14 IT service providers ranked on evidence in the Q4 2026 edition.

Between them, the 16 IT service providers on this page cover mobile app development (12), iOS app (12), web design (11) and android (11). 16 of them have written a profile you can read before you get in touch.

We list more than 700 IT service providers in the USA listed for .NET development. The order comes from what each firm publishes and what has been verified about it, never from payment — at the top right now: SingleMind, INAP and UST Global.

Before you shortlist, check

Work on current .NET versions, not only legacy .NET Framework
A plan for moving any old .NET Framework code forward
Automated tests and deployment you can run yourself
That you own the code and the build pipeline

TrustList ranking

Q4 2026 edition

3 of 14 IT service providers ranked on evidence held on 12 October 2026: client reviews, vetting, awards and facts each business states on its own website, which we read and date. Nobody pays to be placed.

Positions are fixed for the quarter; the next edition is due in January 2027.

How this is ranked About this edition

All IT service providers 3 ranked SMEs 3 ranked

Filter by fitbudget, engagement, size and more

SynapseIndia
Web Development · Web Design · UI/UX Design · Also in Delhi NCR
SynapseIndia is an IT outsourcing company headquartered in Noida, India, founded in 2000.
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Why #1: Address in United States of America · Founded 2000, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
Roundedcube
Mobile App Development · Web Development · iOS App
Roundedcube is a customer experience technology agency in St. Louis, Missouri, founded in 2002.
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Why #2: Based in St. Louis, Missouri, United States · Founded 2002, as stated on its own website, read 6 Oct 2026
Not yet on record: client reviews, vetting.
Simpalm
Mobile App Development · Web Development · iOS App
Simpalm is a digital product development company that has been operating since 2009.
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Why #3: Based in Offices in DC and Chicago · Founded 2009, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
Also listed, not yet ranked. We hold nothing checkable on these yet that ranks them here: no client review, vetting, award, expert review, or fact stated on their own website (and on a place ranking, where they are based). They follow in order of their TrustList Score. How TrustList ranks · Get vetted, free
Merce Technologies Private Limited
Mobile App Development · Web Development · iOS App
Merce Technologies Private Limited, known as Mercé, is a software services company in India that focuses on projects for banking, financial services, insurance and e-governance.
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On record: In business 20+ years, as stated on its own website, read 5 Oct 2026
Softescu
Mobile App Development · Web Development · iOS App
Softescu is a software company founded in 2008 that builds and supports enterprise systems. It serves organisations in Europe and the United States.
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On record: Founded 2008, as stated on its own website, read 6 Oct 2026
Techverx
Mobile App Development · Custom Software Development · Web Development
Techverx is a full-stack software development company that now focuses on AI transformation.
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On record: Microsoft partner · Team of 60+, as stated on its own website, read 5 Oct 2026
DianApps Technologies
Mobile App Development · Web Development · iOS App
DianApps is a well-known and prestigious global web and mobile app development company.
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On record: Address in United States of America
X-Byte Enterprise Solutions
Mobile App Development · Custom Software Development · Web Development
X-Byte Enterprise Solutions is a well-diversified corporation covering Web & App Development by leveraging the latest technology and helping enterprises of all sizes to make…
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OptiSol Business Solutions
Mobile App Development · Web Development · iOS App
OptiSol Business Solutions is an IT services firm with a development centre in India and offices in the US, Ireland, Sweden, Dubai and the UK.
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On record: Team of 450+, as stated on its own website, read 5 Oct 2026
ADK Group
Mobile App Development · Web Development · Java
ADK Group is a Boston-based team of entrepreneurs and programmers who build software, mobile apps and websites.
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On record: Based in Boston, USA
ENGAGENCY
ERP Software Development · Web Development · Web Design
Engagency is a systems integrator that specialises in Sitecore, a .NET content management platform.
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Katpro Technologies
Web Development · Web Design · Software Development
Katpro Technologies is a technology consultancy that works on the Microsoft platform.
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Leobit
Mobile App Development · Web Development · iOS App
European software provider offering .NET, AI and web development with dedicated teams for technology companies and startups
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TechBlocks
Mobile App Development · Custom Software Development · ERP Software Development
Digital product development firm offering AI transformation, custom business apps and system integration for enterprises
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Joined since the Q4 2026 edition. These listings arrived after the edition was ranked; they get a place at the next one (January 2027).
Skipfour LLC
Mobile App Development · Web Development · iOS App
Skipfour LLC is a software company headquartered in San Francisco, California.
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AO
Access One, Inc.
Web Development · iOS App · Web Design
Founded in 1993 with its base in Chicago, Access One, Inc. provides business technology and communications services.
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For vendors

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How is this ranking worked out?

The order comes from what each firm publishes and what has been verified about it, and never from payment:

Profile completeness: the details a buyer needs to judge a firm — what it does, who it serves, how it prices, who it has worked for
Earned trust: verification, awards and the other checks a firm has actually passed
Client reviews, where they exist: the rating is smoothed, so one five-star review cannot outrank a firm with a hundred good ones, and volume counts with diminishing returns

Client reviews are still rare across this catalogue, so on most lists today the order is set by the first two. A firm near the top is the best-documented and best-verified one we hold, which is not the same claim as the best one to hire. Use the list to build a shortlist, then check the firms yourself.

Sponsored listings are labelled and shown apart from this list. How rankings work

Only firms whose profile names the USA are counted here, so a firm that lists a town but no country is not yet included.

Where else can I look?

The same list elsewhere: India (465) · UK (457) · Germany (222) · Canada (143).

Other specialisms in the USA: e-commerce (1,539) · Android app development (1,530) · iOS app development (1,452) · UI/UX design (1,355) · PHP development (946).

Every IT service provider in the USA: the full list.

Every category in the USA: the USA country page.

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More on TrustList

Everything here links back to the same verified catalogue. Pick your next stop.

Top IT Service Providers for .NET in the USA

SynapseIndia

Roundedcube

Simpalm

Merce Technologies Private Limited

Softescu

Techverx

DianApps Technologies

X-Byte Enterprise Solutions

OptiSol Business Solutions

ADK Group

ENGAGENCY

Katpro Technologies

Leobit

TechBlocks

Skipfour LLC

Access One, Inc.