Top .NET Development Companies in 2026

The .NET ecosystem continues to flourish in 2026, with over 478,000 packages on NuGet that have been downloaded over 800 billion times. Numbers from StackOverflow’s annual developer surveys support this. In 2025, 19.7% of developers used ASP.NET Core and 14.2% used ASP.NET.

.NET is one of the most reliable, high-performing back-end technologies around. No surprise that many custom software development vendors list it among their skills, even if their experience runs shallow.

Finding a partner who delivers quality work and fits your business needs among numerous .NET development firms can be challenging.

In our new article, we provide an overview of the top .NET development companies for 2026.

.NET is Microsoft’s platform for web, mobile, desktop, and cloud applications, with C# as its primary language. Microsoft ships a new version every year, and .NET 10 arrived on November 11, 2025, as a long-term support release backed until November 2028. The technology is known for unmatched performance, stability, flexibility, and a rich ecosystem that supports a wide range of applications, from web software to cross-platform solutions.

Building effective, business-driven software on .NET takes great technical skill and a solid grasp of the Microsoft ecosystem. That’s where .NET development companies can help. Such a vendor uses the .NET ecosystem to build custom software for its end customers. The scope typically covers ASP.NET Core web applications, Blazor interfaces, .NET MAUI mobile apps, modernization of legacy .NET Framework systems, and AI development with a. NET-centered technology stack.

Four things separate a strong partner from a team that simply lists .NET on its website.

• Microsoft Solutions Partner designations. Microsoft grants these based on performance, skilling, and customer success metrics. Designations in Digital & App Innovation and Data & AI are the relevant ones for custom .NET work.
• Modern .NET experience. .NET Core differs from the older .NET Framework in architecture, performance, and deployment. A reliable .NET development partner should keep up with innovations to deliver relevant software that won’t need modernization right after release.
• Cloud and architecture depth. Most .NET systems now run on Azure or another cloud. Your technology partner should have experience with cloud scaling, caching, and data strategy.
• Security and process maturity. ISO 27001 certification, documented code reviews, and automated testing show the vendor’s process maturity.

One more signal is worth checking. A company that covers the full cycle, from the discovery phase and architecture design through QA and long-term support, keeps your product with one team instead of handing it between vendors as it grows.

To build this shortlist, we reviewed 57 vendors that list .NET among their core technologies.

Our research covered company websites and profiles on review platforms like Clutch, GoodFirms, and G2. We also reviewed Microsoft’s partner directory and publicly available case studies. Companies made the list when they met the following criteria:

• Published .NET case studies naming the technologies used and the outcomes achieved
• Coverage across the .NET technology stack, including ASP.NET Core, Blazor, .NET MAUI, and migration from the legacy .NET Framework
• Certified engineers on staff, with numbers stated publicly by the company
• Client reviews from the past two years that reference .NET work specifically
• Clear engagement models, from dedicated teams to full-cycle product delivery

Vendors were excluded when their .NET work was offered only as part of broader digital service packages, or when their most recent publicly documented .NET project predated .NET 8.

Based on the criteria above, we compiled a list of 10 companies with strong .NET development expertise that serve different industries and work with businesses of all sizes.

1. Leobit

Leobit is a full-cycle AI, web, mobile, and .NET development company that has been working with the Microsoft stack since 2014. The company runs a representative office in Austin, TX (USA) and development centers in Lviv (Ukraine), London (UK), Tallinn (Estonia), and Krakow (Poland).

.NET is one of Leobit’s core technologies. The team has so far delivered 100+ .NET projects. Leobit also employs 78 Microsoft and Azure-certified engineers and holds Microsoft Solutions Partner designations for Digital & App Innovation and Data & AI. The vendor covers the full .NET stack: ASP.NET Core for high-load web applications and APIs, Blazor for interactive web interfaces written in C#, .NET MAUI for cross-platform mobile apps, WPF and WinForms for desktop software, and ML.NET for machine learning inside .NET applications. Leobit’s software development expertise covers a wide range of industries, including real estate, fintech, healthcare, and sportstech.

Beyond new development, Leobit handles migrations to the most recent .NET versions. The team migrates applications from Java, PHP, and Python to .NET, and reengineers legacy .NET systems using gradual strategies such as the Strangler Facade pattern, which keeps the application running throughout the migration. Most .NET solutions Leobit builds run on Azure, which lets the team pair .NET engineering with AI development on the same stack.

Engagements run end to end, from the discovery phase and architecture design through engineering, QA, and long-term support. Leobit is certified under ISO 9001:2015 and ISO 27001:2022, holds ISTQB Platinum Partner status, and builds solutions that support GDPR, HIPAA, and CCPA requirements.

Leobit recently introduced an AI-native software development lifecycle. AI now runs through every stage of a project, from planning to deployment and post-release support. This approach allows Leobit’s development teams to increase productivity, improve software quality, and shorten time-to-market with full human oversight of every release.

On Clutch, Leobit holds a 4.9/5 stars rating across 61 verified reviews, and clients point to the team’s technology depth and proactive communication. Clutch also consistently ranks Leobit among top .NET development companies globally, holding strong positions in Clutch’s Top .NET Developers Matrix.

Leobit is a strong fit for mid-market and growth-stage companies that want .NET delivery from Microsoft-certified engineers and a partner who stays with the product, without enterprise integrator overhead.

2. Future Processing

Future Processing is a Polish software development company headquartered in Gliwice, with additional offices in London, Düsseldorf, and Stockholm. Founded in 2000, the vendor has spent over two decades building enterprise systems for clients mostly across Europe.
The company has been a Microsoft partner since 2007. It holds Solutions Partner designations in Data & AI, Digital & App Innovation, and Infrastructure, along with the Azure Scalable and Secure badge.

Future Processing approaches .NET as part of a wider cloud engineering practice built on C# and Azure. Its teams handle cloud migration for existing .NET systems, cloud-native development, and the operational layer around it, including infrastructure as code with Terraform, Bicep, and ARM templates. The company also runs an AI and machine learning practice, and it applies an AI-enabled advisory and delivery framework across engagements.

On Clutch, Future Processing holds a 4.7/5 stars rating across 51 verified reviews. Clients highlight the technical expertise and professionalism of the teams, while some reviewers mention concerns about the accuracy of cost estimates.

Future Processing is a strong fit for enterprises in insurance and finance that plan long-term engagements and need a partner with mature governance for a modernization program.

3. Xebia

Xebia is an international technology company headquartered in Amsterdam, with 25 years of experience in custom software development.

The company employs around 1,500 Microsoft-certified professionals, including 27+ Microsoft MVPs and several Regional Directors. Xebia also holds the Microsoft Solutions Partner status in five areas, covering Data & AI, Digital & App Innovation, Security, Infrastructure, and Training, along with the Microsoft AI Applications on Azure specialization.

For .NET work, Xebia positions engineering inside a wider multi-cloud practice supported by its ACE platform, which spans Azure, AWS, and Google Cloud. In practice, .NET development at Xebia comes with the surrounding discipline. That includes building Azure DevOps and GitHub pipelines and developing secure, compliant apps for regulated industries. Xebia also embeds its specialists as team extensions, helping clients raise the maturity of their in-house .NET teams.

Xebia was named GitHub Global Partner of the Year in both 2024 and 2025, and Global Security Partner of the Year in 2024. On Clutch, Xebia has a 4.7/5 stars rating based on 7 reviews. Clients highlight the collaborative approach and proactiveness of its teams. Still, some reviews mention gaps in problem framing and strategic planning during the early stages of engagements.

Xebia is a strong fit for enterprises that want .NET delivery bundled with GitHub-based DevOps, as well as security-centric development for regulated industries.

4. BairesDev

BairesDev is a technology company headquartered in Mountain View, California, with engineering talent concentrated in Latin America. Founded in 2009, it has grown into a large and global enterprise, with 4,000+ engineers on staff. The Financial Times has recognized the company among America’s Fastest-Growing Companies.

BairesDev’s expertise covers ASP.NET Core application development, container orchestration with Azure Kubernetes Service, identity management through Microsoft Entra ID, and Dynamics 365 work. The company is a Microsoft Gold Certified Partner and holds ISO 27001 certification for information security.

The vendor’s delivery model centers on augmenting engineers to a clients’ existing teams. BairesDev’s .NET developers have experience working across industries including agriculture, automotive, and construction. The company also prioritizes long-term collaboration, with average partnerships running longer than three years.

On Clutch, BairesDev holds a 4.9/5 stars rating across 63 reviews. Clients cite technical depth and cultural alignment, along with disciplined use of communication tools such as Slack and Jira. Still, some reviewers mention occasional communication challenges.

BairesDev is a strong fit for companies scaling engineering capacity in nearby time zones while staying on the Microsoft stack.

5. Emergent Software

Emergent Software is a Microsoft-focused engineering and consulting firm headquartered in Minneapolis, Minnesota. The company positions itself as a full-stack Microsoft technology partner.

Emergent Software’s Microsoft credentials include Solutions Partner designations across Data & AI, Infrastructure, Security, Modern Work, and Support Services. The company also operates as a Microsoft Direct Cloud Solution Provider.

Emergent Software works across multiple industries, with particular focus on hospitality, information technology, and legal services. The company’s custom ASP.NET MVC development comes paired with a substantial SQL Server practice covering ETL development, data warehousing, and database migration to Azure. The company also offers website security audits with remediation and helps customers establish DevOps-based delivery processes.

The company’s Clutch profile displays a 4.9/5 stars rating based on 36 client reviews. Clients often mention efficient delivery, subject expertise, and the ability to solve complex problems.

Emergent Software is a strong fit for mid-sized and enterprise organizations that need .NET development paired with strong data engineering and management expertise.

6. Scalo

Scalo is a Polish software development company headquartered in Wrocław, with additional offices in Gdańsk, Kraków, Berlin, and Plano, Texas. Founded in 2007, the company has already delivered 750+ projects across 13 countries.

Their .NET development services sit alongside Java, Python, and other back-end stacks. Within that practice, Scalo covers custom ASP.NET application development, cloud-based systems, system integrations, and legacy modernization. The company holds Microsoft Gold certification and provides Azure DevOps consulting.

Scalo works across multiple industries, particularly in energy and natural resources, finance, media, and manufacturing. Clients most often engage the company for staff augmentation and team scaling.

On Clutch, Scalo holds a 4.6/5 stars rating based on 33 customer reviews. Reviewers point to broad industry coverage and the ability to scale development teams quickly as project requirements change.

Scalo is a strong fit for scale-ups and enterprises in energy, finance, or manufacturing that need to add .NET capacity fast.

7. Orient Software

Orient Software is a Vietnamese software development company established in 2005. The company specializes in providing dedicated teams to startups, small and mid-sized businesses, and enterprises across finance, education, and information technology.

Orient Software holds Microsoft Solutions Partner designations in Data & AI (Azure) and Digital & App Innovation. Its .NET and ASP.NET practice covers the full lifecycle, from architecture design through development and post-launch optimization, and clients can engage either a dedicated team or a project-based one.

The company’s Clutch profile features 4 five-star reviews, and the vendor also has positive client feedback featured on other review platforms, such as GoodFirms. Their clients highlight reliable delivery, effective communication, and on-time completion.

Orient Software is a strong fit for startups and SMBs that need dedicated .NET teams and can work with a wide time zone gap.

8. Saritasa

Saritasa is a custom software development company headquartered in Irvine, California, with a second office in Tampa, Florida. The company has spent about 20 years in business and reports 1,769 completed projects.

Alongside .NET development, Saritasa builds mobile and web applications, AI and machine learning solutions, IoT systems, and AR and VR products. The company also manages cloud infrastructure and provides ongoing software maintenance. The company’s .NET practice primarily covers IoT system development or mobile engineering with technologies like .NET MAUI.

The company holds Clutch Premiere Verified status and a place in the Clutch 1000 for 2024, plus an Inc. Power Partner Award in 2025. On Clutch, Saritasa has a 4.8/5 stars rating based on 106 client reviews. Most of their clients emphasize strong project management and a flexible approach to projects. Meanwhile, some customers mention minor concerns with project delays and budget overruns.

Saritasa is a strong fit for US companies that want onshore project management across .NET and connected device work.

9. Pell Software

Pell Software is a custom software development company headquartered in Denver, Colorado, founded in 2019. The company has a rather small team of specialists and relies exclusively on a US-based engineering staff.

Pell Software specializes in building custom business software, API and data integrations, and application modernization projects, with .NET among its recognized specializations. Business process automation and AI software development round out the offering. Pell Software serves construction, transportation, retail and point of sale, manufacturing, and staffing businesses.

To accelerate software delivery, the company uses a library of custom modules and templates developed in-house, which the team reuses to accelerate delivery. Pell Software puts emphasis on seniority of its specialists, almost eliminating the account layers between the team and the end-customer.

On Clutch, Pell Software holds a 5/5 stars rating based on 28 customer reviews. Clients emphasize successful system integrations and strong communication. Clutch also named the company a Top Software Developer in Denver for 2026.

Pell Software is a strong fit for small and mid-sized US businesses that want a senior .NET team working closely with them, with no time zone gap.

10. Marcel Digital

Marcel Digital is a development agency headquartered in Chicago, Illinois, operating since 2013.

The company’s .NET work centers on Umbraco, an open-source CMS built on ASP.NET Core. Its developers use the platform’s capabilities and build custom solutions on top of it. The goal is to help clients improve SEO, paid media performance, and conversion rates. Marcel Digital also offers its clients a more traditional custom software development practice with ASP.NET.

The company became a Microsoft Partner in 2026, and it works as a Google Premier Partner and a HubSpot Solutions Partner. On Clutch, the vendor holds a 4.8/5 stars rating based on 20 client reviews. Most customers praise the company’s technical expertise and timely project delivery. However, some reviews suggest room for improvement in proactive communication and feedback.

Marcel Digital is a strong fit for marketing-led .NET website projects on Umbraco, where SEO and demand generation matter as much as engineering.

The companies on this list serve businesses of different sizes, with .NET capabilities that range from full product engineering to optimizing marketing websites. Some modernize enterprise .NET platforms and run them in the cloud, while others add .NET engineers to a client’s in-house team.

To find the .NET partner that fits your needs, start by naming the problem you actually have. A legacy migration, a new SaaS product, and a capacity gap each call for a different type of vendor. Then check published case studies and client reviews against that problem, since hands-on evidence tells you far more than a list of services.

If you need a .NET partner with verified Microsoft credentials and a decade of delivery behind it, Leobit can help. Contact us to discuss how .NET can deliver value to your business.