ASP.NET continues to be a favorite framework for building secure, scalable, and high-performance web applications, especially in enterprise settings. In the USA, several specialized development companies excel at delivering custom .NET solutions- from modern cloud-native apps and API integrations to legacy system upgrades and full-stack enterprise software. The top firms stand out thanks to strong technical depth, solid project track records, and a real focus on client success. They offer transparent communication, flexible team models, and reliable delivery that keeps projects on schedule and on budget. Many have extensive experience across finance, healthcare, e-commerce, and manufacturing, where ASP.NET’s strengths in security and performance really matter.
These leading providers handle everything from custom development and modernization to team augmentation and ongoing support, making them dependable long-term partners for businesses looking to build future-proof software.
1. A-Listware
At A-listware we focus on IT outsourcing and staffing solutions, mainly by providing experienced developers for remote work. ASP.NET development is part of what we handle when clients need Microsoft-based web applications or enterprise-level systems built with .NET technologies. We take care of the full process – from finding suitable candidates and conducting interviews to managing the day-to-day work of the developers once they’re on board.
Clients usually reach out when they want to expand their in-house capabilities without building everything from scratch locally. We set up dedicated teams that integrate into existing workflows, often for custom software projects that involve ASP.NET alongside other related tools. Communication stays straightforward, and we adjust based on project needs as things move forward.
Wichtigste Highlights:
- Emphasis on remote developer staffing
- Handling of interviews and onboarding
- Management of day-to-day developer work
- Focus on ASP.NET within .NET projects
Dienstleistungen:
- IT-Outsourcing Personalbeschaffung
- ASP.NET development
- .NET application development
- Engagierte Entwicklungsteams
- Fernverwaltung von Teams
Kontaktinformationen:
- Website: a-listware.com
- Telefon: +1 (888) 337 93 73
- E-Mail: info@a-listware.com
- Anschrift: North Bergen, NJ 07047, USA
- LinkedIn: www.linkedin.com/company/a-listware
- Facebook: www.facebook.com/alistware
2. WissenschaftSoft
ScienceSoft has been around since 1989 and operates as a US-based corporation focused on IT consulting and software development. The company handles a range of projects, including custom solutions built with .NET technologies like ASP.NET, .NET Core, and C#. It draws on a pool of IT professionals to manage everything from planning and development to modernization and integration for various industries.
Clients often come across ScienceSoft when searching for structured approaches to .NET-based web apps, enterprise software, or backend systems. The firm maintains offices in North America and other regions, which supports collaboration on projects that require consistent oversight and risk management. Experience spans decades, with a history of working on complex initiatives across healthcare and other sectors.
Wichtigste Highlights:
- Microsoft Partner Network member with various competencies
- ISO certifications for quality and security
- Featured in industry lists like Inc. 5000 and Global Outsourcing 100
Dienstleistungen:
- Custom .NET software development
- ASP.NET development
- .NET consulting
- Modernisierung von Altbeständen
- Verstärkung des Teams
- Backend-Entwicklung
Kontaktinformationen:
- Website: www.scnsoft.com
- Telefon: +1 214 306 68 37
- E-Mail: contact@scnsoft.com
- Anschrift: 5900 S. Lake Forest Drive, Suite 300, McKinney, Region Dallas, TX-75070
- LinkedIn: www.linkedin.com/company/sciencesoft
- Facebook: www.facebook.com/sciencesoft.solutions
- Twitter: x.com/ScienceSoft
3. Fingent
Fingent delivers custom software development with a focus on Microsoft technologies, including ASP.NET for building web applications. The company works on projects that involve creating scalable systems, modernizing legacy code, and integrating various components to meet business requirements.
Many clients appreciate the structured methodology that Fingent applies to application development and maintenance. It handles tasks like developing new web-based solutions using .NET Framework, C#, and related tools, often for industries such as media, real estate, and IT services. The approach emphasizes on-time delivery and thorough processes.
Wichtigste Highlights:
- US-based custom software development firm
- ISO 27001 certified
- Experience with Microsoft Dynamics and .NET projects
- Client projects include CRM integrations and cloud migrations
Dienstleistungen:
- Entwicklung kundenspezifischer Anwendungen
- Entwicklung von Webanwendungen
- Microsoft technology services including ASP.NET
- Wartung und Unterstützung
- Modernisierung von Altanwendungen
- Sicherheit und Konformität
Kontaktinformationen:
- Website: www.fingent.com
- Telefon: +1 (914) 615-9170
- E-Mail: info@fingent.com
- Adresse: 235 Mamaroneck Ave Suite #301, White Plains, NY 10605
- LinkedIn: www.linkedin.com/company/fingent-technologies
- Facebook: www.facebook.com/Fingent
- Twitter: x.com/fingent
- Instagram: www.instagram.com/fingentcorporation
4. Chetu
Chetu started back in 2000 and functions as a US-based provider of custom software solutions with delivery centers across several states. It offers development using .NET frameworks, including ASP.NET, C#, and related tools for web, mobile, and enterprise applications. The company organizes developers by industry focus to address specific domain needs.
Projects at Chetu often involve full-cycle development, from initial requirements to ongoing support and modifications. It emphasizes source code ownership for clients and handles migrations or modernizations when needed. With a large developer base, the firm supports a wide variety of sectors like healthcare, finance, and retail.
Wichtigste Highlights:
- Gegründet im Jahr 2000
- Multiple US delivery centers
- Industry-specific virtual divisions
- Source code and IP ownership provided
Dienstleistungen:
- Custom .NET application development
- ASP.NET development
- Modernisierung von Legacy-Anwendungen
- C# programming
- Application management and modification
- Entwicklung von Websites und mobilen Anwendungen
Kontaktinformationen:
- Website: www.chetu.com
- Telefon: 954 342 5676
- E-Mail: sales@chetu.com
- Anschrift: 1500 Concord Terrace Suite 100, Sunrise FL 33323
- LinkedIn: www.linkedin.com/company/chetu-inc-
- Facebook: www.facebook.com/ChetuInc
- Twitter: x.com/ChetuInc
5. Saritasa
Saritasa provides custom software development with expertise in .NET technologies, including backend solutions for web applications, CRMs, portals, and databases. The company builds systems using ASP.NET Core and similar frameworks to support scalable business needs across different sectors.
The approach centers on end-to-end development, from design through deployment and maintenance. Saritasa handles dedicated teams for projects of various sizes and takes on legacy modernizations or complex integrations when required. It maintains a focus on practical, results-oriented technology applications.
Wichtigste Highlights:
- 206 team members
- Custom .NET development emphasis
- Experience with web, mobile, and IoT apps
Dienstleistungen:
- Custom .NET development
- Backend solutions
- Entwicklung von Webanwendungen
- Entwicklung kundenspezifischer Software
- Modernisierung von Altbeständen
- Engagierte Entwicklungsteams
Kontaktinformationen:
- Website: www.saritasa.com
- Phone: 888.424.8792
- Email: info@saritasa.com
- Address: 19900 MacArthur Boulevard #650, Irvine, CA 92612
- LinkedIn: www.linkedin.com/company/saritasa
- Facebook: www.facebook.com/SaritasaLLC
- Twitter: x.com/SaritasaLLC
6. TatvaSoft
TatvaSoft maintains offices in the US among other countries and focuses on custom software development with a clear emphasis on Microsoft .NET technologies. The company handles ASP.NET development for web applications, often building high-performing solutions that include custom controls, secure features, and scalable architecture. It supports projects through dedicated developers or full outsourcing models, drawing from experience accumulated since around 2001.
Many reviews and listings place TatvaSoft in discussions about ASP.NET services available to USA businesses. The firm completes a variety of projects across industries like fintech, healthcare, retail, and education. Communication syncs well in some cases, and they sign NDAs when requested. CMMI Level certification appears in their profile too.
Wichtigste Highlights:
- Offices in the US and several other countries
- CMMI Level 3 certified
- Experience with ASP.NET and .NET solutions
- Completed numerous projects for global clients
Dienstleistungen:
- Custom .NET software development
- ASP.NET development
- Entwicklung von Webanwendungen
- Engagierte Entwicklungsteams
- Verstärkung des Teams
- Wartung und Unterstützung
Kontaktinformationen:
- Website: www.tatvasoft.com
- Phone: +1 (503) 832-4034
- Email: info@tatvasoft.com
- Address: 17304 Preston Road Suite 800 Dallas, Texas 75252 United States
- LinkedIn: www.linkedin.com/company/tatvasoft
- Facebook: www.facebook.com/TatvaSoft
- Twitter: x.com/tatvasoft
7. Iflexion
Iflexion operates with a US office in Decatur, Georgia, and delivers full-cycle custom software development that includes .NET-based solutions. The company works on .NET projects alongside other stacks, often incorporating Microsoft Azure for cloud aspects when needed. It applies agile methodologies like Scrum or SAFe depending on project scale and client setup.
Clients reach out through various channels, and the firm responds relatively quickly to initial inquiries. Engagement models range from full outsourcing to dedicated teams or staff augmentation. Project handovers include documentation transfer and support phases for ongoing monitoring.
Wichtigste Highlights:
- US office in Georgia
- Gegründet 1999
- Expertise in .NET development
- ISO-certified processes
- Multiple engagement models available
Dienstleistungen:
- .NET software development
- Custom web applications
- Engagierte Teams
- Aufstockung des Personals
- Cloud services with Azure
- Sicherung der Qualität
Kontaktinformationen:
- Website: www.iflexion.com
- Telefon: +1 720 207 0369
- Email: contact@iflexion.com
- Adresse: 160 Clairemont Ave, Suite 200, Decatur, GA 30030
8. Integrative Systems
Integrative Systems sits in Chicago and specializes in Microsoft technologies for custom software. It builds web applications using ASP.NET MVC, Web API, and related .NET tools, alongside desktop solutions with WPF and mobile options via PowerApps. The company also handles legacy work and integrations with Dynamics 365, SharePoint, and SQL Server.
With more in operation, the firm positions itself as a partner for SMBs and larger enterprises in North America. It offers full engineering services, from planning to deployment, with emphasis on security through certifications like SOC 2. Responsive support forms part of the ongoing relationship.
Wichtigste Highlights:
- Based in Chicago
- Strong focus on Microsoft stack
- SOC 2 and ISO certifications
- Experience with ASP.NET and .NET Core
Dienstleistungen:
- ASP.NET web development
- .NET custom applications
- Microsoft Dynamics services
- Modernisierung von Altbeständen
- Data analytics with Power BI
- Unterstützung der IT-Infrastruktur
Kontaktinformationen:
- Website: www.integrativesystems.com
- Phone: 1.866.468.7974
- Email: contact@integrativesystems.com
- Address: 2500 S Highland Ave, Suite 100, Lombard, Illinois 60148
- LinkedIn: www.linkedin.com/company/integrativesystems
- Facebook: www.facebook.com/integrativesystems1
9. Clarion Technologies
Clarion Technologies provides custom software development services with a focus on web and mobile applications. The company handles projects using various frameworks, including those in the Microsoft .NET ecosystem like ASP.NET for building web solutions. It covers full-cycle work from design and development to testing and support, often for businesses looking to launch or update platforms.
Clients sometimes mention Clarion in conversations about .NET-based development in the USA market. The firm incorporates cloud services and AI elements into projects when relevant, alongside standard QA processes. Experience spans multiple years, with emphasis placed on cycle time reduction in some descriptions.
Wichtigste Highlights:
- US-Betriebe
- Erfahrung in der Entwicklung kundenspezifischer Software
- Services include AI and cloud integration
- Focus on performance and QA
Dienstleistungen:
- Entwicklung kundenspezifischer Software
- Web-Entwicklung
- Entwicklung mobiler Anwendungen
- Software-Tests und QA
- Cloud-Lösungen
- AI-powered development
Kontaktinformationen:
- Website: www.clariontech.com
- Telefon: +1 (888)-551-0371
- E-Mail: info@clariontech.com
- Anschrift: 50 Main Street, Suite 1000, White Plains, New York 10606, USA
- LinkedIn: www.linkedin.com/company/clariontechnologies
- Twitter: x.com/Clarion_Tech
- Instagram: www.instagram.com/clarion_technologies
10. Chudovo
Chudovo works as a custom software development company with experience in implementing complex systems. It delivers web, desktop, and cloud projects, frequently using .NET technologies including ASP.NET for application building. The company applies various methodologies to projects in sectors like finance, healthcare, and logistics.
Founded in 2006, Chudovo maintains a presence that supports work for international clients, including those in the USA. Portfolio entries show completed initiatives across different platforms, with attention given to transparency during development phases.
Wichtigste Highlights:
- Gegründet im Jahr 2006
- Experience in complex system implementation
- Portfolio includes web and cloud projects
- Focus on various industries
Dienstleistungen:
- Entwicklung kundenspezifischer Software
- .NET application development
- ASP.NET development
- Web and desktop solutions
- Cloud implementation
Kontaktinformationen:
- Website: chudovo.com
- E-Mail: info@chudovo.com
- Address: 99 Wall Street #123, New York, NY 10005
- LinkedIn: www.linkedin.com/company/chudovo
- Facebook: www.facebook.com/chudovoitcompany
11. Cimulus
Cimulus operates out of Ann Arbor, Michigan, and specializes in software development with a strong emphasis on Microsoft technologies. Developers there handle .NET projects, including web applications built with ASP.NET, alongside integrations, databases like SQL, and custom workflows. The company assembles project-specific groups from its in-house developers.
Started back in 1992, Cimulus keeps an office setup that mixes in-person collaboration with some remote flexibility. It works directly with clients on solutions designed for efficiency in business processes.
Wichtigste Highlights:
- Founded in 1992
- Located in Ann Arbor, Michigan
- Microsoft technology focus
- In-house developers for projects
- Emphasis on integrations and workflows
Dienstleistungen:
- .NET development
- ASP.NET web applications
- Individuelle Software-Lösungen
- Database and SQL work
- API-Integrationen
Kontaktinformationen:
- Website: cimulus.com
- Phone: (734) 327-9532
- Email: sales@cimulus.com
- Address: 1665 Highland Drive, Ste. A Ann Arbor, MI 48108-2297
12. Persistent Systems
Persistent Systems delivers digital engineering and modernization services with expertise across enterprise solutions. It works extensively with Microsoft technologies, including .NET and ASP.NET for developing custom applications and web platforms. The company supports clients in modernizing systems and implementing new features.
With a long history in the industry, Persistent appears in many USA-focused discussions about .NET development partners. It combines technical work with industry-specific approaches for various sectors.
Wichtigste Highlights:
- Deep experience in digital engineering
- Microsoft technology partnerships
- Focus on enterprise modernization
- Multiple recognitions in industry lists
Dienstleistungen:
- Custom .NET development
- ASP.NET application development
- Softwarelösungen für Unternehmen
- Modernisierung des Systems
- Cloud and AI integration
Kontaktinformationen:
- Website: www.persistent.com
- E-Mail: info@persistent.com
- Telefon: +1-650-481-9180
- Address: 2055 Laurelwood Rd Ste 210, Santa Clara CA – 95054
- LinkedIn: www.linkedin.com/company/persistent-systems
- Facebook: www.facebook.com/PersistentSystems
- Twitter: x.com/Persistentsys
- Instagram: www.instagram.com/persistent_systems
13. BairesDev
BairesDev got its start in Buenos Aires back in 2009 and has since focused on connecting companies with software developers for various projects. The company handles custom development work that can include ASP.NET when clients need Microsoft-based web applications or enterprise solutions. It often steps in to help scale development capacity quickly for startups and larger organizations alike.
Many clients mention repeat business with BairesDev after initial projects go smoothly. The firm delivers across a range of industries and maintains a fully remote setup from early on. Experience comes from completing numerous initiatives over the years.
Wichtigste Highlights:
- Gegründet im Jahr 2009
- Fully remote operations
- Works with startups and Fortune 500 companies
Dienstleistungen:
- Entwicklung kundenspezifischer Software
- ASP.NET development
- Entwicklung von Webanwendungen
- Aufstockung des Personals
- Project-based development
Kontaktinformationen:
- Website: www.bairesdev.com
- Telefon: +1 (408) 478-2739
- Anschrift: 195 Montague Street, New York, USA
- LinkedIn: www.linkedin.com/company/bairesdev
- Facebook: www.facebook.com/bairesdev
- Twitter: x.com/bairesdev
- Instagram: www.instagram.com/bairesdev
14. Altoros
Altoros provides IT consulting and development services with a concentration on cloud-native approaches and modern technologies. It works with .NET in certain projects, particularly when integrating Microsoft Azure or building enterprise applications that require ASP.NET components. The company supports full-cycle work from strategy through implementation and training.
Clients sometimes turn to Altoros for transformation projects that involve legacy modernization or scalable solutions. Offices exist in several locations to facilitate collaboration. Experience spans two decades in the field.
Wichtigste Highlights:
- Expertise in cloud automation
- Experience with Microsoft Azure
- Focus on enterprise-grade solutions
Dienstleistungen:
- Cloud-native Entwicklung
- .NET application development
- ASP.NET integration
- Beratung zur digitalen Transformation
- Kubernetes implementation
Kontaktinformationen:
- Website: www.altoros.com
- Phone: 1 650 419 3379
- Email: d.castelli@altoros.com
- Address: 4900 Hopyard Rd. Suite 100 Pleasanton, CA 94588
- LinkedIn: www.linkedin.com/company/altoros-systems
- Facebook: www.facebook.com/Altoros
- Twitter: x.com/altoros
15. 10Pearls
10Pearls delivers mobile and digital product development for startups and enterprises. The company includes .NET technologies in its stack for building custom web applications and backend systems using ASP.NET when projects call for it. It emphasizes innovative solutions alongside ongoing employee training and community involvement.
The firm maintains a presence that allows work with clients across different regions, including the USA. It runs internal labs to explore emerging tech trends that sometimes influence .NET-based deliveries.
Wichtigste Highlights:
- Double bottom line approach
- Investment in employee development
- Exploration of AI and emerging technologies
- Commitment to community programs
Dienstleistungen:
- Custom digital product development
- .NET web applications
- ASP.NET development
- Entwicklung mobiler Anwendungen
- Innovative solution design
Kontaktinformationen:
- Website: 10pearls.de
- Adresse: 8614 Westwood Center Dr, Ste 540 Wien, VA 22182
- Phone: +1 (703) 935-1919
- E-Mail: info@10pearls.com
- LinkedIn: www.linkedin.com/company/10pearls
- Facebook: www.facebook.com/10Pearls
- Twitter: x.com/TenPearls
16. Bacancy Technologie
Bacancy Technology offers software development services that cover web and mobile applications along with newer areas like AI and data science. It provides ASP.NET development as part of its Microsoft technology capabilities for custom solutions and enterprise needs. The company supports staff augmentation models where clients interview candidates before onboarding.
Clients appreciate the communication and flexibility in time zones for USA-based projects. Bacancy handles transitions to SaaS models and maintains multiple offices worldwide.
Wichtigste Highlights:
- Started in 2011
- Staff augmentation with interviews
- Experience in digital transformation
- Quick onboarding processes
Dienstleistungen:
- Entwicklung kundenspezifischer Software
- ASP.NET development
- Web and mobile solutions
- Aufstockung des Personals
- SaaS transitions
- Integration von KI und ML
Kontaktinformationen:
- Website: www.bacancytechnology.com
- Email: career@bacancy.com
- Anschrift: 33 South Wood Ave, Suite 600, Iselin NJ 08830
- LinkedIn: www.linkedin.com/company/bacancy-technology
- Facebook: www.facebook.com/BacancyTechnologyLimited
- Twitter: x.com/bacancyTech
- Instagram: www.instagram.com/bacancytechnology
17. iQlance
iQlance provides .NET development services with a strong focus on ASP.NET for custom web applications and enterprise systems, serving clients across the USA. The company uses C#, MVC, Web Services, and other Microsoft tools to create scalable solutions that fit business requirements. It maintains a US phone number and regularly handles projects in various American cities.
Clients in the USA frequently discover iQlance through searches related to ASP.NET expertise, particularly in places like Dallas, Houston, or San Francisco. Options include hiring dedicated .NET developers and performing migrations from older ASP versions to modern frameworks. The work covers custom software along with web and mobile development.
Wichtigste Highlights:
- US phone number available
- Specialization in .NET and ASP.NET
- Dedicated developer hiring model
- Projects across multiple US cities
Dienstleistungen:
- ASP.NET development
- .NET application development
- Individuelle Software-Lösungen
- Entwicklung von Webanwendungen
- Hire .NET developers
- Legacy migration to ASP.NET
Kontaktinformationen:
- Website: www.iqlance.com
- Phone: +1 469 793 9837
- E-Mail: info@iqlance.com
- Address: 17250 Dallas Pkwy, Dallas, TX 75248, USA
- LinkedIn: www.linkedin.com/company/iqlance-solutions
- Facebook: www.facebook.com/iQlance
- Twitter: x.com/iqlance
- Instagram: www.instagram.com/iQlance
Schlussfolgerung
Picking the right ASP.NET development partner in the USA really comes down to what your project actually needs right now – not some shiny list of buzzwords or trophy clients. Some situations call for deep Microsoft stack expertise and quick team ramp-up, others need someone who can quietly handle legacy upgrades without drama, and plenty just want reliable communication that doesn’t vanish after the contract is signed.
The landscape has plenty of solid options if you know what to look for: transparent processes, realistic timelines, developers who actually stay on the project long-term, and a willingness to say “no, that feature won’t help you” instead of nodding along. Take your time digging into how they’ve handled similar challenges before – past project examples, how they deal with changes mid-stream, the way they explain trade-offs. That usually tells you more than any polished homepage ever will.
At the end of the day, the companies that stick around and keep delivering aren’t always the loudest ones. They’re the ones who treat your software like it matters to their own business, because in a way it does.
