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.NET Application Development Companies in the UK

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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
    Sergii Steshenko
    CEO & Co-Founder @ Lengreo

    The UK tech landscape is buzzing, and .NET development companies are at the heart of it. From enterprise-grade systems to sleek web applications and cloud-first solutions, these firms deliver the stability and scalability modern businesses demand.

    What sets UK-based .NET providers apart? It’s the combination of highly skilled talent, a culture of innovation, and proven experience helping companies scale fast. Choosing a UK .NET development company means more than hiring coders-it’s partnering with experts who know how to transform business challenges into powerful, value-driven software solutions.

    1. LenGreo

    1. LenGreo

    At Lengreo, we work with businesses to navigate the digital landscape and build strategies that are shaped around their specific goals. Our focus is on helping organisations generate qualified leads, strengthen their online presence, and use the right mix of channels to grow effectively. While we offer a full range of digital marketing and development services, the way we approach each project is grounded in collaboration and tailoring our work to match the strengths of our clients. We are also a company that deals with .net application development, providing our services to the UK.

    Flexibility is part of how we operate, whether that means meeting clients in person when practical or providing clear communication that ensures they stay confident in the process. Our aim is to create strategies and systems that don’t just exist on paper but actually drive measurable outcomes in real business settings.

     

    Key Highlights:

    • Focus on generating qualified leads and refining strategies
    • Willingness to integrate with client teams
    • Offers in-person collaboration in Central Europe when needed
    • Transparent communication as a core practice

     

    Services:

    • B2B digital marketing strategy and consulting
    • Lead generation and appointment setting
    • Search engine optimization (SEO)
    • Social media and content marketing
    • Paid advertising management
    • Demand generation
    • Website development services

     

    Contact and Social Media Information:

    Our cases
    SEO for a Premium Tobacco Shop
    SEO for a Premium Tobacco Shop
    SEO for BIM & VDC Services Provider
    SEO for BIM & VDC Services Provider
    PPC For Adult Content Platform
    PPC For Adult Content Platform
    2. 6B Systems

    2. 6B Systems

    6B Systems builds custom software with a heavy emphasis on .NET. They’re known for tackling complex projects – think massive data handling, tough compliance requirements, and enterprise-level performance.

    They lean on tools like .NET Core and Azure, with an eye toward systems that last. Whether it’s customer-facing platforms or behind-the-scenes business tools, their goal is simple: build software that works and keeps working.

     

    Key Highlights:

    • Works with multiple industries, including public and private sectors
    • Emphasis on long-term maintainability and performance

     

    Services:

    • Custom software development with .NET
    • Integration with Microsoft technologies like Azure and Active Directory
    • Development of enterprise-level applications and microservices

     

    Contact Information:

    • Website: 6b.systems
    • E-mail: info@6b.systems
    • Twitter: x.com/6b_digital
    • Instagram: www.instagram.com/6bdigital
    • Phone: 0113 350 1290

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      3. Sapphire Software Solutions

      3. Sapphire Software Solutions

      Sapphire Software Solutions is an IT company established in 2002, offering a broad range of services including web and mobile application development. They work with enterprises, independent software vendors (ISVs), digital agencies, and startups, providing tailored solutions to meet diverse business needs. Their team combines technical expertise with industry knowledge to support digital transformation initiatives across various sectors.

      The company has a presence in the UK, delivering .NET application development services to clients in cities such as London, Manchester, Cambridge, Edinburgh, Bristol, and Birmingham. Their approach emphasizes collaboration with clients to understand unique requirements and deliver scalable, secure, and efficient solutions. 

       

      Key Highlights:

      • Established in 2002
      • Serves enterprises, ISVs, digital agencies, and startups
      • Emphasis on collaboration and tailored solutions

       

      Services:

      • .NET application development
      • Web and mobile application development
      • API integration and development
      • IT consulting and digital transformation support

       

      Contact Information:

      • Website: www.sapphiresolutions.net
      • E-mail: contact@sapphiresolutions.net
      • Facebook: www.facebook.com/SapphireSoftwareSolution
      • Twitter: x.com/SapphireSoftwa
      • LinkedIn: www.linkedin.com/company/sapphire-software-solutions
      • Instagram: www.instagram.com/sapphiresoftwaresolutions
      • Address: 42 Audley Avenue, Gillingham, ME73AY, UK
      • Phone: +1 754 258 7670
      4. fastfwd

      4. fastfwd

      fastfwd operates as a digital consultancy that provides support across different stages of web development. They assist in scoping, planning, and building web projects, offering expertise in both PHP and .NET environments. Beyond technical execution, they also provide guidance in areas like SEO, design, and marketing.

      Their focus extends to how websites interact with broader digital strategies, helping clients integrate online platforms with other channels. This allows them to work on projects that consider both immediate technical needs and the wider business context.

       

      Key Highlights:

      • Offers consultancy from project scoping through to delivery
      • Provides input on technology choice between platforms
      • Focus on integration with wider digital strategies

       

      Services:

      • .NET and PHP development
      • SEO and digital marketing guidance
      • Web design and strategy consulting

       

      Contact Information:

      • Website: www.fastfwd.com
      • E-mail: website@fastfwd.com
      • Address: Falcon Works House, 40 Regent Place, Birmingham, B1 3NN, United Kingdom
      • Phone: +44 121 236 8007
      5. I-Finity

      5. I-Finity

      I-Finity is a family-run software company established in York in 2002. Originating as a consultancy focused on project and service management, they have expanded into custom software development while keeping flexibility as a core principle. With experience across both public and private sectors, they apply their knowledge to deliver technology solutions adapted to changing client needs.

      The business emphasizes making technology accessible through tailored platforms, combining long-term industry experience with newer technical approaches. They work with local and international clients, supporting a variety of development requirements.

       

      Key Highlights:

      • Second-generation family business
      • Established background in consultancy before moving into software development
      • Provides services to clients both locally and internationally

       

      Services:

      • Custom software development
      • Project and service management consulting
      • Flexible platform development

       

      Contact Information:

      • Website: www.i-finity.co.uk
      • E-mail: hello@i-finity.co.uk
      • Facebook: www.facebook.com/IFinityHQ
      • Twitter: x.com/ifinityhq
      • LinkedIn: www.linkedin.com/company/i-finity
      • Instagram: www.instagram.com/ifinityhq
      • Address: Blake House, 66 Bootham, York, YO30 7BZ
      • Phone: 01904 652100
      6. Krify UK Limited

      6. Krify UK Limited

      Krify UK Limited develops applications using Microsoft’s .NET framework, with services covering the entire project lifecycle from design through to ongoing support. They focus on building secure and scalable applications tailored to the needs of businesses of different sizes, including startups, SMEs, and large organizations.

      Based in London, the company develops web portals, APIs, and cloud-based applications. Their approach involves close collaboration with clients and the use of Microsoft technologies to ensure integration and performance across platforms.

       

      Key Highlights:

      • Based in London with focus on .NET solutions
      • Works with clients ranging from startups to enterprises
      • Covers full development lifecycle including maintenance

       

      Services:

      • .NET web and software development
      • API and cloud-based application development
      • Application design, development, and support

       

      Contact Information:

      • Website: krify.co.uk
      • E-mail: Info@krify.co
      • Facebook: www.facebook.com/krify
      • Twitter: x.com/krifysoftware
      • Instagram: www.instagram.com/krifysoftware
      • Address: 128 City Road, London, United Kingdom​ EC1V 2NX.
      • Phone: +44 20 3006 2580
      7. Lilo

      7. Lilo

      Lilo is a London-based agency that focuses on web design and development, working with clients ranging from small businesses to larger organisations. Having been active in the digital space since the early days of modern web technology, they have followed the transition from simple websites to more advanced, interactive systems.

      The team operates across multiple locations worldwide, though they maintain a compact structure that allows for direct communication. Their projects often emphasise building interactive and functional websites while combining design and development skills to meet client needs.

       

      Key Highlights:

      • Based in London with a history in digital projects
      • Small but globally distributed team

       

      Services:

      • Web design and development
      • eCommerce solutions
      • SEO and digital marketing

       

      Contact Information:

      • Website: www.lilo.co.uk
      • Facebook: www.facebook.com/LiloWebDev
      • Twitter: x.com/LiloWebDev
      • LinkedIn: www.linkedin.com/company/lilo-london
      • Instagram: www.instagram.com/lilowebdev
      • Address: 1st Floor, 187 Wardour St, Soho, London, W1F 8ZB United Kingdom
      • Phone: +44(0) 207 100 1140
      8. Matellio

      8. Matellio

      Matellio provides software engineering and development services with a focus on tailored web platforms. Their work includes building responsive websites with secure backends and quality assurance processes, aimed at supporting different client requirements.

      Alongside web development, the company also develops embedded systems, IoT solutions, and GIS applications. Their approach extends beyond building software to cover consulting and engineering from initial design stages through to product testing and delivery.

       

      Key Highlights:

      • Offers both software and hardware-related development services
      • Works with technologies like IoT and GIS
      • Provides consulting alongside technical delivery

       

      Services:

      • Web development and UI/UX design
      • Embedded product engineering
      • IoT development
      • Digital mapping and GIS solutions

       

      Contact Information:

      • Website: www.matellio.co.uk
      • E-mail: info@matellio.co.uk
      • Phone: +44 204-540-6064
      9. Cool Code Company

      9. Cool Code Company

      Cool Code Company started as a small, Nottingham-based venture focused on bespoke software development and has grown into a team with diverse technical skills. They emphasize creating tailored solutions that fit a company’s exact needs rather than forcing businesses to adapt to software limitations. Their experience is reflected in long-standing client relationships and a focus on consistent delivery over time.

      They handle projects of varying complexity, relying on the collective expertise of their development team. This includes building new applications, maintaining existing systems, and providing ongoing technical support to ensure that software continues to meet business requirements.

       

      Key Highlights:

      • Focus on bespoke software development
      • Long-term client relationships
      • Team with diverse and experienced developers
      • Emphasis on practical, tailored solutions

       

      Services:

      • Custom software development
      • System maintenance and updates
      • Technical support and troubleshooting
      • Bespoke application consulting

       

      Contact Information:

      • Website: www.coolcodecompany.co.uk
      • E-mail: hello@coolcodecompany.co.uk
      • Facebook: www.facebook.com/CoolCodeCompany
      • Twitter: x.com/CoolCodeCompany
      • LinkedIn: www.linkedin.com/company/cool-code-company
      • Address: 11 Oak Street Nottingham NG5 2AT
      • Phone: 0115 772 2751
      10. Propel Tech

      10. Propel Tech

      Propel Tech has a history rooted in creating bespoke applications, with a focus on solving real business problems through technology. Over time, they have grown into a team that combines creative problem-solving with technical expertise, using .NET to streamline operations and improve workflows. Their approach involves close collaboration with clients to understand existing systems and business processes before developing solutions.

      The company works across various industries, providing both development and support services for .NET applications. Their projects range from maintaining existing systems to creating new feature-rich applications tailored to a client’s specific operational needs.

       

      Key Highlights:

      • Experienced in bespoke .NET application development
      • Collaborative approach with clients
      • Support for both ongoing operations and new projects
      • Works across multiple industries

       

      Services:

      • .NET application development
      • System support and maintenance
      • Feature-rich application design
      • Process improvement through technology

       

      Contact Information:

      • Website: propeltech.co.uk
      • Email: hello@propeltech.co.uk
      • Twitter: x.com/PropelTechUK
      • LinkedIn: www.linkedin.com/company/propel-tech
      • Phone: 01727 537627
      • Address: The Stables, South Wing, Ashlyns Hall Berkhamsted, Hertfordshire, HP4 2S
      11. 200OK

      11. 200OK

      200OK Solutions approaches .NET application development by tailoring solutions to the unique needs of each business they work with. They focus on creating applications that adapt to evolving business goals and challenges, aiming for flexibility rather than one-size-fits-all solutions. Their work spans from developing custom applications to supporting broader digital transformation efforts, with a practical approach to integrating technology into everyday business processes.

      Their .NET development services are built around understanding the context of the company and creating tools that help manage specific challenges. They aim for solutions that are adaptable, allowing businesses to respond to change without needing a complete overhaul of their systems.

       

      Key Highlights:

      • Focus on custom .NET applications
      • Solutions designed to adapt to evolving business goals
      • Support for digital transformation initiatives
      • Emphasis on practical technology integration

       

      Services:

      • Custom .NET application development
      • Application support and maintenance
      • Digital transformation guidance
      • Technology consulting and advisory

       

      Contact Information:

      • Website: 200oksolutions.com
      • E-mail: info@200oksolutions.com
      • Twitter: x.com/200ok_Solutions
      • LinkedIn: www.linkedin.com/company/200ok-solutions
      • Instagram: www.instagram.com/200ok_solutions
      • Address: 63/66 Hatton Garden, Fifth Floor, Suite 23 London, EC1N 8LE
      • Phone: +44 20 3372 4627
      12. Audacia

      12. Audacia

      Audacia is a UK-based software company that develops systems described as business-critical, meaning applications that sit at the core of daily operations rather than on the periphery. From the start, their work has been guided by two principles: keeping the development process simple even when the software itself is complex, and building projects on a foundation of transparency, trust, and collaboration. These principles continue to frame how they operate with clients today.

      The company has developed a culture that aims to balance delivering large, integral projects with maintaining a close-knit environment internally. Their approach places importance on creating software that integrates deeply into how organisations function, while also ensuring that their teams work in an environment where contributions are valued and open dialogue is encouraged.

       

      Key Highlights:

      • Focuses on building business-critical software
      • Guided by principles of simplicity and collaboration
      • Combines capacity for large projects with a smaller team culture

       

      Services:

      • Custom software development
      • Core business system design and delivery
      • Collaborative project planning and implementation

       

      Contact Information:

      • Website: audacia.co.uk
      • E-mail: info@audacia.co.uk
      • Facebook: www.facebook.com/AudaciaTechnology
      • Twitter: x.com/audacia_tech
      • LinkedIn: www.linkedin.com/company/audacia-consulting
      • Address: Becket House, 36 Old Jewry, London, UK, EC2R 8DD
      • Phone: 0203 855 6040

      Conclusion

      .NET has earned its place in the UK’s tech scene, and for good reason. It’s reliable, flexible, and perfect for systems that need to scale without breaking. The cool thing about the UK is the variety: some companies are long-standing consultancies with decades under their belts, while others are fresh teams bringing new energy to the space.

      There’s no single “best” route for businesses – some projects demand heavy-duty, enterprise solutions, while others need leaner, adaptable builds that grow over time. What stays constant is .NET’s role as a rock-solid framework that balances performance with maintainability.

      Looking ahead, as cloud tech, AI, and data-heavy apps keep shaping the market, .NET will almost certainly stay one of the core building blocks behind the digital products UK businesses depend on every day.

      AI Summary