Leading .NET Application Development Companies in the USA

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    Targets we’ve achieved:
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    AI Summary
    Max Mykal
    Co-Founder @ Lengreo

      .NET might not be the newest kid on the block, but it’s still the backbone of countless enterprise apps and internal systems running behind the scenes. If you’re working on something complex that needs to scale, stay secure, and just work reliably day after day, finding the right .NET development team is non-negotiable. This isn’t about finding a vendor who knows how to spin up a few web pages. It’s about partnering with a team that gets the architecture, knows how to handle performance under pressure, and doesn’t flinch at long-term support or complicated integrations. The companies in this list aren’t just checking boxes – they’re actually building real stuff for real businesses that need it to work.

      1. LenGreo

      1. LenGreo

      At LenGreo, we work closely with businesses that need reliable digital infrastructure, and that includes full-cycle .NET application development. We don’t offer generic solutions. Instead, we focus on building and maintaining systems that actually support the long-term goals of our clients. For companies in the U.S. looking to create scalable and stable .NET-based applications, we’re involved from strategy and architecture to delivery and optimization.

      Our work in .NET fits into a broader mix of services like website development, SEO, demand generation, and digital marketing. We’ve built projects across a range of industries, and we prefer to integrate with our client’s teams rather than work in isolation. Whether it’s a legacy system that needs modernization or a new .NET-based platform built from scratch, we keep the process grounded and results-driven without overcomplicating things.

       

      Key Highlights:

      • Provides .NET application development for U.S. businesses
      • Offers integrated digital strategy, development, and execution
      • Works across B2B, SaaS, biotech, fintech, and other industries
      • Maintains long-term partnerships and prioritizes transparency

      Services:

      • Custom Web Development
      • .NET Application Development
      • Website Development
      • SEO and AI-SEO
      • Lead Generation and Appointment Setting
      • Paid Ads and PPC Strategy
      • Demand Generation
      • Content Marketing and Social Media Management

      Contact Information:

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      SEO for BIM & VDC Services Provider
      SEO for BIM & VDC Services Provider
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      PPC For Adult Content Platform
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      Biological Age Blood Testing Kit
      2. Iflexion

      2. Iflexion

      Iflexion offers .NET application development as part of its broader custom software services for companies in the USA and beyond. The company focuses on full-cycle software engineering and works across a variety of industries, helping clients with internal platforms, enterprise apps, and product development. Their work in .NET includes designing scalable systems, integrating with cloud services, and supporting web and desktop applications.

      They approach development from both a business and technical perspective, offering solutions that align with existing operations. Whether clients are looking to modernize older systems or build something new, Iflexion provides dedicated teams that cover planning, architecture, implementation, and long-term support.

       

      Key Highlights:

      • Offers full-cycle .NET application development
      • Supports enterprise software across different industries
      • Combines software engineering with business process alignment
      • Provides dedicated development teams and ongoing support

      Services:

      • Custom Software Development
      • .NET Application Development
      • Mobile App Development
      • UX/UI Design
      • Cloud and DevOps
      • E-commerce and Marketplaces
      • QA and Testing
      • AI and Data Analytics

      Contact Information:

      • Website: www.iflexion.com
      • Address: 160 Clairemont Ave, Suite 200, Decatur, GA 30030, USA
      • Phone: +1 (720) 207 0369
      • E-mail: contact@iflexion.com

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        3. ELEKS

        3. ELEKS

        ELEKS provides .NET application development services for U.S. businesses seeking custom-built enterprise software. The company works across a wide range of sectors and handles end-to-end product delivery. Their teams support both new software initiatives and legacy system modernization using Microsoft technologies.

        The company’s work in .NET includes enterprise-level app architecture, API integrations, and support for industries like healthcare, finance, logistics, and government. With a flexible development process, ELEKS offers advisory, implementation, and support to meet varied project scopes.

         

        Key Highlights:

        • Delivers custom .NET software for enterprise needs
        • Supports digital transformation and legacy modernization
        • Works with clients in healthcare, energy, and logistics
        • Provides global delivery with local support

        Services:

        • Application Development
        • Enterprise Software Engineering
        • .NET-Based Product Development
        • Cloud and Infrastructure Services
        • QA and Software Testing
        • Data and AI Solutions
        • UX Consulting and Technical Audits

        Contact Information:

        • Website: eleks.com
        • Address: 625 W. Adams St., Chicago, IL 60661                                            
        • Phone: +17089674803
        • LinkedIn: www.linkedin.com/company/eleks
        • Twitter: x.com/ELEKSSoftware
        • Facebook: www.facebook.com/ELEKS.Software
        4. Intellectsoft

        4. Intellectsoft

        Intellectsoft develops .NET-based applications for businesses in the USA looking to build, upgrade, or scale software systems. They offer full-cycle development services and provide support across industries like healthcare, fintech, construction, and logistics. Their teams help companies navigate everything from MVPs to enterprise-scale rollouts.

        The company focuses on practical delivery and long-term system value. Their approach combines engineering with product thinking, helping clients integrate digital tools into business operations with .NET technologies as a core option.

         

        Key Highlights:

        • Provides .NET development as part of end-to-end delivery
        • Works with enterprise clients and startups
        • Offers industry-specific custom software
        • Supports integration, automation, and modernization

        Services:

        • .NET Application Development
        • Custom Software Solutions
        • Business Process Automation
        • End-to-End System Integration
        • UI/UX Design
        • Cloud and AI Solutions
        • QA and Testing

        Contact Information:

        • Website: www.intellectsoft.net
        • Address: 500 Fashion Ave Fl 8A, New York City, NY 10018, USA
        • Phone: +1 (650) 233-6196
        • E-mail: info@intellectsoft.net
        • LinkedIn: www.linkedin.com/company/intellectsoft
        • Twitter: x.com/Intellectsoft
        • Facebook: www.facebook.com/Intellectsoft
        5. Itransition

        5. Itransition

        Itransition builds .NET applications for companies across the U.S., focusing on scalable business software. Their development process includes application engineering, integration, product support, and system audits. The company supports different stages of the project life cycle and brings in specialists for system security, QA, and cloud operations.

        .NET plays a central role in their work for enterprise systems and digital platforms. Itransition applies this stack to both internal management tools and client-facing applications. Their teams offer structured delivery and long-term project engagement.

         

        Key Highlights:

        • Provides .NET development for digital and enterprise software
        • Supports integration and secure development practices
        • Works with a wide range of business sectors
        • Offers full-cycle project support

        Services:

        • Application Development
        • Software Product Engineering
        • .NET Enterprise Integration
        • Application Security
        • QA and Testing
        • Data Analytics and Automation
        • Advisory and System Architecture

        Contact Information:

        • Website: www.itransition.com
        • Address: 160 Clairemont Ave, Suite 200, Decatur, GA 30030, USA
        • Phone: +1 720 207 2820
        • E-mail: info@itransition.com
        • LinkedIn: www.linkedin.com/company/itransition
        • Twitter: x.com/itransition
        • Facebook: www.facebook.com/Itransition
        6. Oxagile

        6. Oxagile

        Oxagile delivers .NET application development services for companies that need tailored systems in areas like media, sports, and finance. Their teams focus on building scalable platforms and often work on long-term software modernization and custom integrations.

        The company supports .NET-based backends for high-performance apps, often pairing this with frontend frameworks or complex video and data pipelines. They emphasize strong collaboration and integration into client workflows, providing consistent delivery across custom projects.

         

        Key Highlights:

        • Develops custom .NET applications for media, sports, and AdTech
        • Works with cross-functional teams on large-scale systems
        • Handles backend architecture and frontend integration
        • Offers R&D and long-term technical partnerships

        Services:

        • .NET Application Development
        • Custom Software Engineering
        • DevOps and QA
        • AI and Computer Vision
        • UX/UI Design
        • Product Development
        • System Integration and Support

        Contact Information:

        • Website: www.oxagile.com
        • Address: 165 Broadway, 23rd Floor, New York, NY 10006, USA
        • Phone: +1 332 242 2402
        • LinkedIn: www.linkedin.com/company/oxagile
        • Twitter: x.com/Oxagile
        • Facebook: www.facebook.com/oxagile
        7. Altoros

        7. Altoros

        Altoros provides .NET application development services as part of its custom software solutions for U.S. enterprises. The company supports businesses looking to bridge Web2 systems with newer Web3 technologies while keeping software performance stable and secure. Their .NET development focuses on creating flexible platforms that can support both traditional enterprise functions and decentralized features.

        The company works across finance, real estate, and other regulated industries, offering middleware development, API integrations, and legacy system extensions. With teams based in multiple regions, Altoros delivers development and ongoing support for long-term projects that require compliance, scalability, and consistent architecture.

         

        Key Highlights:

        • Offers .NET application development for U.S. businesses
        • Supports hybrid Web2 and Web3 software models
        • Works on integration, modernization, and system expansion
        • Combines enterprise software practices with blockchain expertise

        Services:

        • .NET Application Development
        • Custom Software Engineering
        • Web3 Integration and Consulting
        • Middleware and API Development
        • Smart Contract and Tokenization Platforms
        • Software Testing and Ongoing Support

        Contact Information:

        • Website: www.altoros.com
        • Address: 4900 Hopyard Rd. Suite 100, Pleasanton, CA 94588, USA
        • Phone: +1 650 419 3379
        • E-mail: d.castelli@altoros.com
        • LinkedIn: www.linkedin.com/company/altoros-systems
        • Twitter: x.com/altoros
        • Facebook: www.facebook.com/Altoros
        8. Syberry

        8. Syberry

        Syberry develops .NET applications for clients across the U.S. who need business-specific platforms that go beyond off-the-shelf software. The company supports custom development from planning through post-launch maintenance, helping clients build tools that match their operations. Their .NET solutions often support ERP systems, SaaS platforms, and other enterprise-grade tools.

        The team works on modernizing legacy systems, creating MVPs, and managing backend architecture. Their development process includes everything from early discovery and scoping to long-term system updates, all shaped around business needs rather than technology trends.

         

        Key Highlights:

        • Delivers .NET development across enterprise and startup use cases
        • Focuses on business processes and custom platform architecture
        • Offers full-cycle delivery, including QA and long-term support
        • Builds systems for industries like healthcare, education, and energy

        Services:

        • .NET Application Development
        • ERP and CRM Software
        • Cloud and DevOps Services
        • AI Software Development
        • Legacy System Modernization
        • QA and Testing
        • Dedicated Development Teams

        Contact Information:

        • Website: www.syberry.com
        • Address: 5910 Courtyard Dr. STE 105, Austin, TX 78731, USA
        • Phone: (512) 400-0056
        • E-mail: contact@syberry.com
        • LinkedIn: www.linkedin.com/company/syberry
        9. Net Solutions

        9. Net Solutions

        Net Solutions offers .NET application development services for companies in the USA that need scalable and reliable business software. Their teams handle both new builds and modernization projects, using .NET for web platforms, cloud systems, and internal tools. The company supports product development across different sectors, including retail, banking, and healthcare.

        With a distributed team, Net Solutions helps clients move through full development cycles, from early discovery and design to launch and maintenance. Their .NET work fits into a broader focus on digital transformation and system integration, often tied to larger tech overhauls.

         

        Key Highlights:

        • Provides .NET development for enterprise and eCommerce software
        • Supports modernization of legacy business platforms
        • Handles full-cycle delivery with distributed teams
        • Works with both startups and large enterprises

        Services:

        • .NET Application Development
        • Custom Software Engineering
        • Application Modernization
        • MVP Development
        • UX/UI Design
        • QA and Testing
        • DevOps and Cloud Support

        Contact Information:

        • Website: www.netsolutions.com
        • Address: 11601 Wilshire Blvd, 5th Floor, Los Angeles, CA 90025, USA
        • Phone: +1 (305) 767-3821
        • E-mail:  info@netsolutions.com
        • LinkedIn: www.linkedin.com/company/net-solutions
        • Twitter: x.com/netsolutions
        • Facebook: www.facebook.com/NetSolutionsHQ
        • Instagram: www.instagram.com/netsolutions
        10. Zibtek

        10. Zibtek

        Zibtek delivers .NET application development services to businesses in the U.S. looking for support with scalable custom software. The company offers both project-based development and staff augmentation models, making it possible to work on either long-term system builds or shorter integration projects. Zibtek supports clients across sectors with software engineering, testing, DevOps, and design services.

        Their .NET development fits into a broader approach to web and mobile software, backend system architecture, and modernization of legacy tools. The team combines U.S.-based management with global engineering resources, which allows flexibility in how work gets delivered and scaled.

         

        Key Highlights:

        • Offers .NET development through staff augmentation or full project delivery
        • Works with clients across startups and enterprise sectors
        • U.S.-based leadership with global engineering teams
        • Supports legacy upgrades, backend development, and cloud integration

        Services:

        • .NET Application Development
        • Custom Software Development
        • QA and Testing
        • Mobile and Web Development
        • DevOps Support
        • UI/UX Design
        • IT Staff Augmentation

         

        Contact Information:

        • Website: www.zibtek.com
        • Address: 14193 South Minuteman Drive SUITE 100, Draper, UT 84020, USA
        • Phone: +1 (385) 832 6227
        • E-mail: hello@zibtek.com
        • LinkedIn: www.linkedin.com/company/zibtek
        • Twitter: x.com/zibtek
        • Facebook: www.facebook.com/Zibtek
        11. BairesDev

        11. BairesDev

        BairesDev provides .NET application development services as part of its custom software solutions for companies across the United States. The company offers a wide range of software engineering capabilities, with a focus on scalable solutions that can be extended or adapted based on business needs. Their teams work in a nearshore model, allowing close collaboration with U.S. clients in overlapping time zones.

        Their .NET development services are used for backend systems, ERP integrations, SaaS platforms, and cross-platform app builds. BairesDev covers most common technology stacks and works with both large organizations and fast-growing startups across various sectors.

         

        Key Highlights:

        • Delivers .NET development using nearshore teams
        • Covers full-stack software development and support
        • Works with businesses in healthcare, finance, e-commerce, and tech
        • Offers flexible delivery models and support for scaling teams

        Services:

        • .NET Application Development
        • Custom Software Development
        • Staff Augmentation
        • Mobile and Web App Development
        • QA and Testing
        • AI and Data Science Solutions
        • DevOps and Infrastructure Engineering

        Contact Information:

        • Website: www.bairesdev.com
        • Address: 50 California StreetCalifornia, USA
        • Phone: +1 (408) 478-2739
        • LinkedIn: www.linkedin.com/company/bairesdev
        • Twitter: x.com/bairesdev
        • Facebook: www.facebook.com/bairesdev
        • Instagram: www.instagram.com/bairesdev
        12. Simform

        12. Simform

        Simform supports .NET application development through its broader product engineering and cloud services. The company works with U.S. businesses to build scalable platforms, digital tools, and cloud-native systems. Their teams include backend developers, solution architects, and DevOps engineers who help plan, build, and maintain complex applications using .NET frameworks.

        The company offers flexible collaboration models, including co-engineering with in-house teams. Simform supports clients looking to build custom platforms, move to the cloud, or integrate with enterprise systems, and focuses on working closely with technical leadership throughout a project.

         

        Key Highlights:

        • Provides .NET development for backend and enterprise platforms
        • Works across cloud, DevOps, and product engineering domains
        • Supports co-engineering with in-house teams
        • Focuses on long-term platform scaling and modernization

        Services:

        • .NET Application Development
        • Product Engineering
        • DevOps and Cloud Services
        • Data and AI Engineering
        • Experience Design
        • QA and Testing
        • System Integration and Support

        Contact Information:

        • Website: www.simform.com
        • LinkedIn: www.linkedin.com/company/simform
        • Twitter: x.com/simform
        • Facebook: www.facebook.com/simform
        13. LeewayHertz

        13. LeewayHertz

        LeewayHertz offers .NET application development services for companies that need enterprise-level software tailored to specific workflows. While the company is known for its AI and blockchain work, it also supports clients with backend systems and custom platforms using the Microsoft stack. Their development services are often tied into broader digital transformation projects.

        The company works with a wide range of industries including finance, logistics, and retail, and provides full-cycle development from early planning to post-deployment support. LeewayHertz supports both new app development and the extension of existing systems.

        Key Highlights:

        • Offers .NET application development for enterprise projects
        • Works across AI, blockchain, and traditional web systems
        • Supports clients in regulated industries like finance and healthcare
        • Delivers both standalone and integrated software platforms

        Services:

        • .NET Application Development
        • Custom Software Development
        • AI Consulting and Integration
        • Blockchain and Web3 Development
        • Data Engineering
        • System Architecture and Design
        • Application Support and Maintenance

        Contact Information:

        • Website: www.leewayhertz.com
        • Address: 5th Floor, Tower C, Unitech Cyber Park, Sector 39, Gurugram, Haryana 122001
        • E-mail: sales@leewayhertz.com
        • LinkedIn: www.linkedin.com/company/leewayhertz-technologies
        • Twitter: x.com/LeewayHertz
        • Facebook: www.facebook.com/LeewayHertz
        14. RipenApps

        14. RipenApps

        RipenApps provides .NET application development as part of its digital transformation services for businesses in the USA. The company works with a range of clients, including startups and enterprises, helping them build web and mobile platforms that support long-term business operations. Their teams handle everything from consulting and design to development and post-launch support, with a strong focus on aligning software architecture with client goals.

        The company offers a variety of development services, including hybrid apps, backend systems, and IoT integrations, and uses a wide tech stack to support modern software solutions. RipenApps maintains offices in multiple regions but supports U.S. clients through its Ontario, California location.

         

        Key Highlights:

        • Provides .NET app development as part of broader software projects
        • Works with U.S. clients through its California office
        • Supports enterprise and startup-level web systems
        • Offers hybrid app and IoT platform integration

        Services:

        • .NET Application Development
        • Web and Mobile App Development
        • Hybrid App Development
        • UI/UX Design
        • IoT and Beacon Development
        • QA and Software Testing
        • Digital Transformation Consulting

        Contact Information:

        • Website: ripenapps.com
        • Address: 410 E Ontario Ranch Rd Ste 4 #1023 Ontario, CA 91761, USA
        • Phone: +1 (909) 757-6451
        • E-mail: sales@ripenapps.com
        • LinkedIn: www.linkedin.com/company/ripenapps
        • Twitter: x.com/ripenappstech
        • Facebook: www.facebook.com/ripenapps
        • Instagram: www.instagram.com/ripenapps
        15. Dev Technosys

        15. Dev Technosys

        Dev Technosys offers .NET application development as part of its broader services in web and mobile software. The company works with businesses in various sectors, helping them design and launch tools for operations, customer engagement, and automation. Their services include backend development, cross-platform mobile apps, and support for cloud systems, often with a focus on performance and scalability.

        The company has delivery centers in India and offices serving U.S. clients from California. Dev Technosys supports custom solutions that include system architecture, integration, and maintenance, working with companies that need business-specific platforms across healthcare, fintech, and eCommerce.

         

        Key Highlights:

        • Delivers .NET-based web platforms and custom apps
        • Offers mobile, cloud, and IoT development under one team
        • Works with U.S. clients through California office
        • Covers ongoing support and post-launch updates

        Services:

        • .NET Application Development
        • Custom Web and Mobile App Development
        • IoT App Development
        • AI and Chatbot Integration
        • Cross-Platform App Development
        • QA and Support Services
        • UX and Visual Design

         

        Contact Information:

        • Website: devtechnosys.com
        • Address: 5668 E 61st Street Ste 2000 #360 Commerce, California 90040, USA
        • Phone: +1 4155787849
        • E-mail: info@devtechnosys.com
        • LinkedIn: www.linkedin.com/company/dev-technosys-pvt-ltd
        • Twitter: x.com/devtechnosys
        • Facebook: www.facebook.com/devtechnosys
        • Instagram: www.instagram.com/devtechnosys
        16. CMARIX

        16. CMARIX

        CMARIX includes .NET development in its range of software engineering services for companies in the USA. The company delivers web and enterprise solutions across industries like healthcare, education, and fintech. Its teams focus on designing, developing, and maintaining backend systems and custom applications, using Microsoft technologies and other frameworks as needed.

        The company supports different engagement models and provides technical consultation, system integration, and application scaling. With U.S. offices in California and support across several global locations, CMARIX delivers software tailored to individual business operations and requirements.

         

        Key Highlights:

        • Offers .NET development for backend and enterprise systems
        • Provides technical consulting and custom engineering
        • Supports clients in the U.S. through California office
        • Works across multiple industries with flexible delivery models

        Services:

        • .NET Application Development
        • Custom Software Engineering
        • Mobile and Web Development
        • System Integration and API Development
        • AI and Data-Driven Systems
        • UI/UX Design and QA
        • Dedicated Developer Hiring

        Contact Information:

        • Website: www.cmarix.com
        • Address: 32572 Miller Ct. Temecula, CA 92592, USA
        • Phone: +1 415-704-4242
        • E-mail: biz@cmarix.com
        • LinkedIn: www.linkedin.com/company/cmarix
        • Twitter: x.com/cmarixinfotech
        • Facebook: www.facebook.com/cmarixinfotech
        • Instagram: www.instagram.com/cmarixinfotech

        Conclusion

        Finding a solid .NET development partner in the U.S. isn’t really about flashy websites or buzzwords. It’s about knowing that the team behind your app understands how to build something that can actually last. The companies in this article aren’t just writing code – they’re building tools that keep real businesses moving every day, whether it’s managing workflows, handling backend logic, or tying into legacy systems that still matter.

        Some teams lean toward big enterprise builds, others are better with fast-moving mid-sized projects, but they all share one thing in common: a grip on how to make .NET work where it counts. If you’re looking to start something new, fix what’s already running, or just stop worrying about what’s under the hood, any of these developers can help you get there. The important part? Pick the one that gets your priorities, not just your stack.

        AI Summary