Best Application Modernization Companies in the UK

  • Updated on September 8, 2025

Get a free service estimate

Tell us about your project - we will get back with a custom quote

    Modernizing outdated software isn’t just a tech upgrade-it’s a game-changer for businesses looking to stay competitive. In the UK, some top-tier companies are leading the charge, helping firms transform clunky legacy systems into sleek, scalable, cloud-ready applications. Whether it’s boosting performance, tightening security, or cutting costs, these experts know how to make old tech feel new again. Here’s a look at what makes the best application modernization companies in the UK stand out.

    1. A-listware

    We focus on helping businesses update their legacy software to keep pace with modern demands, serving clients across industries like startups and enterprises. Our approach involves assessing existing systems to identify areas for improvement, ensuring applications become more secure, scalable, and user-friendly. By integrating with a client’s existing processes, we aim to deliver solutions that align with their specific goals without causing operational hiccups.

    Our modernization process often includes updating outdated code, enhancing user interfaces, or moving applications to the cloud. We prioritize clear communication and use technologies like AI and cloud solutions to make systems more efficient. With a hands-on approach, we manage every step of the project, from planning to ongoing support, to ensure applications stay functional and relevant over time.

    Key Highlights:

    • Emphasize seamless integration with client workflows
    • Use AI and cloud technologies to enhance functionality
    • Prioritize secure and scalable application designs
    • Offer end-to-end project management
    • Focus on improving user experience through modern interfaces

    Services:

    • Legacy software modernization
    • Cloud application development
    • Custom software development
    • UX/UI design
    • IT consulting

    Contact Information:

    2. N-iX

    N-iX focuses on helping businesses overhaul their legacy systems to keep pace with today’s fast-moving digital world. Their work spans a wide range of industries, from retail to healthcare, offering tailored strategies to tackle outdated software. By blending consulting with hands-on engineering, N-iX guides clients through the entire modernization process, ensuring systems are ready for future challenges while maintaining business continuity.

    Their approach involves a deep dive into a company’s existing tech setup, identifying pain points like technical debt or scalability issues. From there, N-iX crafts custom solutions, whether it’s shifting to cloud infrastructure, breaking down monoliths into microservices, or enhancing user interfaces. Their emphasis on aligning tech upgrades with business goals makes them a go-to for companies needing practical, results-driven modernization.

    Key Highlights:

    • Specialize in turning complex legacy systems into agile, scalable solutions
    • Offer end-to-end services, from strategy to implementation
    • Focus on integrating modern tools like AI, machine learning, and cloud technologies
    • Prioritize seamless communication to align with client needs
    • Experienced in diverse industries, ensuring tailored solutions

    Services:

    • Application modernization consulting
    • Monolith to microservices migration
    • Tech stack modernization
    • Cloud migration (on-prem to cloud or cloud-to-cloud)
    • UI/UX modernization
    • Technical debt management and refactoring
    • Data analytics and AI integration

    Contact Information:

    • Website: www.n-ix.com 
    • Email: contact@n-ix.com
    • Phone: +442037407669
    • Address: 8 Devonshire Square, London EC2M 4YJ
    • LinkedIn: www.linkedin.com/company/n-ix 
    • Facebook: www.facebook.com/N.iX.Company
    • Twitter: x.com/N_iX_Global

    3. TechMagic

    TechMagic takes a comprehensive approach to application modernization, helping businesses breathe new life into aging software. With a strong presence in industries like healthtech and fintech, their services cover everything from code updates to full architectural overhauls. They work closely with clients to understand their unique challenges, ensuring the end result aligns with both technical and business objectives.

    Their modernization process is methodical, starting with a detailed review of existing systems to spot inefficiencies or compliance gaps. TechMagic then tailors solutions, whether it’s rehosting apps on the cloud, reengineering code for better performance, or ensuring cross-platform compatibility. Their focus on security and accessibility, including compliance with standards like GDPR and HIPAA, makes them a solid choice for businesses with strict regulatory needs.

    Key Highlights:

    • Prioritize compliance with industry regulations like GDPR and HIPAA
    • Offer flexible cloud migration options, from rehosting to cloud-native builds
    • Skilled in modernizing apps for web, mobile, and desktop platforms
    • Integrate data analytics for smarter, data-driven applications
    • Provide ongoing support to keep systems up to date

    Services:

    • Application modernization consulting
    • Legacy app migration to cloud
    • Application reengineering and recoding
    • Application re-architecting
    • Application containerization
    • Data modernization
    • Security testing and accessibility compliance

    Contact Information:

    • Website: www.techmagic.co 
    • Email: hello@techmagic.co
    • Address: 41 Devonshire Street W1G 7AJ, London, UK
    • LinkedIn: www.linkedin.com/company/techmagic
    • Facebook: www.facebook.com/TechMagic.co
    • Instagram: www.instagram.com/techmagic

    4. Toobler

    Toobler’s all about keeping things simple while modernizing your apps. They’re pros at helping industries like manufacturing and logistics, taking complicated systems and making them easier to manage without breaking the bank. They’re great at hooking up your apps with your existing enterprise systems, so everything plays nice together.

    They kick things off by looking at your software, especially if it’s a mess with no documentation or ancient code. Then they come up with a plan-maybe it’s a full rebuild, maybe it’s just a tune-up. They lean hard into cloud solutions and automation to keep your systems flexible and ready for whatever’s next.

    Key Highlights:

    • Specialize in connecting applications with enterprise systems
    • Prioritize automation to reduce complexity and costs
    • Address challenges like undocumented code with structured approaches
    • Emphasize cloud-based solutions for flexibility
    • Offer ongoing support to maintain system performance

    Services:

    • Custom application development
    • Application modernization
    • Cloud migration services
    • Application re-architecture
    • Application maintenance and management

    Contact Information:

    • Website: www.toobler.com
    • Phone: +91 484 4034359
    • Email: info@toobler.com
    • Address: Kemp House, 152 – 160 City Road, London, EC1V 2NX
    • LinkedIn: www.linkedin.com/company/toobler
    • Facebook: www.facebook.com/TooblerTechnologies
    • Twitter: x.com/toobler

    5. Urolime

    Urolime takes a practical approach to modernizing legacy applications, helping businesses move from outdated systems to more efficient platforms. With a focus on industries ranging from healthcare to finance, their services are designed to make applications more responsive to changing business needs. Urolime’s methodical process ensures that modernization aligns with a company’s goals without causing major operational hiccups.

    By assessing a client’s application portfolio, Urolime identifies which systems need updates or migration, often using cloud-native tools like containers and microservices. Their work emphasizes steady, incremental changes to keep systems running smoothly while improving functionality. This step-by-step strategy helps businesses avoid the risks of big, disruptive overhauls.

    Key Highlights:

    • Use incremental modernization to minimize disruptions
    • Skilled in cloud-native technologies like containers and microservices
    • Conduct detailed assessments of application portfolios
    • Focus on aligning modernization with business objectives
    • Offer data migration to preserve critical information

    Services:

    • Cloud application modernization
    • Technological modernization
    • Application downsizing
    • Application portfolio assessment
    • Data migration services

    Contact Information:

    • Website: www.urolime.com
    • Phone: +44 (020) 8050 6023
    • Email: info@urolime.com
    • Address: 950 Great West Road Profile West, Brentford, England, TW8 9ES
    • LinkedIn: www.linkedin.com/company/urolime-technologies-private-limited
    • Facebook: www.facebook.com/UROLIME
    • Twitter: x.com/Urolime

    6. esynergy

    esynergy specializes in updating legacy systems for businesses in highly regulated industries like finance and healthcare. Their services focus on making applications scalable and compliant with modern standards, ensuring they meet both current needs and future challenges. By working closely with clients, esynergy tailors solutions to fit specific business goals, often integrating advanced technologies like AI and cloud platforms.

    Their approach involves building flexible frameworks that allow for seamless updates and integrations. esynergy places a strong emphasis on data-driven solutions, helping businesses unlock insights from their systems to improve decision-making. Their work in creating reusable patterns and automated processes helps companies stay efficient while navigating complex regulatory landscapes.

    Key Highlights:

    • Focus on regulated industries with strict compliance needs
    • Integrate AI and data analytics for smarter systems
    • Build scalable platforms for easy updates
    • Emphasize reusable patterns to streamline development
    • Prioritize measurable business outcomes

    Services:

    • Application modernization
    • Platform development
    • Data-driven solutions
    • Generative AI integration
    • Cloud-based transformation

    Contact Information:

    • Website: esynergy.co.uk
    • Phone: 0207 444 4080
    • Email: info@esynergy.co.uk
    • Address: New London House, 6 London St, London EC3R 7LP
    • LinkedIn: www.linkedin.com/company/esynergy-solutions
    • Facebook: www.facebook.com/eSynergySolutions
    • Twitter: x.com/esynergy_
    • Instagram: www.instagram.com/esynergysolutions

    7. Griffiths Waite

    Griffiths Waite helps businesses refresh outdated applications to better support their operations and goals. With a focus on industries like finance and media, their services aim to extend the life of existing systems while making them more flexible and secure. By carefully assessing a client’s current setup, Griffiths Waite ensures that modernization efforts align with business needs, avoiding unnecessary disruptions.

    Their process involves a step-by-step approach, starting with a deep dive into the application’s code and functionality. From there, Griffiths Waite builds tailored roadmaps, often using cloud platforms or open-source technologies to improve scalability and integration. Their emphasis on measurable value, like reducing maintenance costs or enabling new features, keeps the focus on practical outcomes.

    Key Highlights:

    • Conduct thorough assessments to understand legacy systems
    • Use phased modernization to maintain business continuity
    • Focus on open-source platforms for better integration
    • Prioritize resolving technical debt and improving stability
    • Leverage automation and AI for faster results

    Services:

    • Legacy modernization
    • Product development
    • Systems integration
    • AI and data solutions
    • Advisory services

    Contact Information:

    • Website: www.griffiths-waite.co.uk
    • Phone: +44 (0)121 643 4300
    • Email: info@griffiths-waite.co.uk
    • Address: Floor 6 Centre City, 5-7 Hill Street Birmingham, UK B5 4UA
    • LinkedIn: www.linkedin.com/company/griffiths-waite
    • Twitter: x.com/griffithswaite

    8. Noventiq Northern Europe

    Noventiq Northern Europe focuses on updating application portfolios to help businesses stay agile and competitive. Working across sectors like manufacturing and government, their services aim to streamline IT systems while addressing specific business objectives. By starting with a detailed review of a client’s applications, Noventiq Northern Europe ensures modernization efforts are practical and targeted.

    Their approach emphasizes clear planning and incremental changes, often integrating cloud solutions like ServiceNow to enhance functionality. Noventiq Northern Europe also prioritizes creating organized IT repositories to track assets and guide modernization. This structured method helps businesses manage complex transitions while keeping costs and risks in check.

    Key Highlights:

    • Build clear IT asset inventories for better planning
    • Use incremental modernization to reduce risks
    • Integrate cloud platforms like ServiceNow for efficiency
    • Focus on aligning IT upgrades with business goals
    • Offer training to support ongoing modernization

    Services:

    • Application portfolio management
    • Cloud modernization
    • Application modernization design
    • Managed services for continuous modernization
    • ServiceNow integration

    Contact Information:

    • Website: www.noventiq.co.uk
    • Phone: +44 20 3821 1294
    • Email: info.uk@softline-group.com
    • Address: 26/28 Hammersmith Grove, London W6 7HA
    • LinkedIn: www.linkedin.com/company/softline-group-northern-europe
    • Twitter: x.com/softlinene

    9. Cyber-Duck

    Cyber-Duck specializes in transforming legacy applications to meet modern security and performance standards. Serving clients in sectors like healthcare and public services, their services focus on bringing outdated systems up to speed while ensuring compliance with regulations like GDPR. By auditing existing codebases, Cyber-Duck identifies pain points and crafts custom plans to address them.

    Their modernization process often involves upgrading to newer frameworks or cloud platforms like AWS and Azure, with a strong emphasis on user experience. Cyber-Duck also offers training to help internal teams adopt agile practices, ensuring systems stay relevant over time. Their hands-on approach keeps business operations running smoothly during the transition.

    Key Highlights:

    • Prioritize compliance with regulations like GDPR
    • Offer training to embed agile practices
    • Focus on improving user experience during modernization
    • Use cloud platforms for better stability and security
    • Conduct detailed audits to guide modernization plans

    Services:

    • Legacy application transformation
    • Cloud migration
    • UX strategy and design
    • Framework upgrades
    • Business analysis and strategic services

    Contact Information:

    • Website: www.cyber-duck.co.uk
    • Phone: +44 (0)207 602 6000
    • Email: experience@caci.co.uk
    • Address: Kensington Village, West Kensington, London, W14 8TS, United Kingdom
    • LinkedIn: www.linkedin.com/company/cyber-duck
    • Facebook: www.facebook.com/cyberducklondon
    • Twitter: x.com/Cyberduck_uk
    • Instagram: www.instagram.com/cyberduckuk

    10. Simplified Solutions

    Simplified Solutions focuses on updating legacy applications to help businesses run more smoothly and securely. With experience in sectors like banking and insurance, their services aim to tackle outdated systems by improving performance and integrating modern technologies like AI. By assessing a client’s current setup, Simplified Solutions ensures modernization aligns with specific business needs while keeping disruptions to a minimum.

    Their process involves a hands-on approach, from evaluating existing systems with tools like SonarQube to re-engineering applications for cloud compatibility. Simplified Solutions emphasizes building security into every step, ensuring applications meet strict compliance standards like GDPR and PCI DSS. Their work often results in streamlined workflows and better user experiences, making systems easier to maintain over time.

    Key Highlights:

    • Prioritize security and compliance in all modernization projects
    • Use industry-standard tools for system assessments
    • Focus on cross-platform compatibility for broader reach
    • Integrate AI to enhance application functionality
    • Aim to reduce operational costs through efficient designs

    Services:

    • Legacy application re-engineering
    • Cloud migration
    • UI/UX enhancement
    • Security and compliance assessments
    • Cross-platform compatibility

    Contact Information:

    • Website: simplifiedsol.co.uk
    • Phone: +44 7443 934432
    • Email: contact@simplifiedsol.co.uk
    • Address: Sunbury On Thames, London, TW16 7TG
    • LinkedIn: www.linkedin.com/company/simplified-solutions-uk
    • Twitter: x.com/simplified_sol

    11. Kyndryl

    Kyndryl specializes in modernizing complex enterprise applications, particularly for industries like finance and government. Their services focus on transforming legacy systems, such as SAP and Oracle ERP, to improve scalability and business agility. By leveraging cloud-native architectures, Kyndryl helps clients update their systems while ensuring minimal impact on day-to-day operations.

    Their approach starts with a deep understanding of a client’s application portfolio, followed by tailored strategies that might include cloud migration or AI integration. Kyndryl’s use of automation tools and platforms like Kyndryl Bridge helps streamline the modernization process, making systems more responsive and easier to manage. Their emphasis on collaboration ensures that upgrades align with a company’s broader goals.

    Key Highlights:

    • Specialize in modernizing ERP and mainframe systems
    • Use automation to reduce risks during transformation
    • Focus on integrating AI for better user experiences
    • Prioritize business continuity during modernization
    • Leverage cloud platforms for scalability

    Services:

    • Application modernization
    • Cloud migration
    • AI integration
    • ERP system transformation
    • Infrastructure management

    Contact Information:

    • Website: www.kyndryl.com
    • Phone: +1.855.596.3795
    • Email: sales@kyndryl.com
    • Address: 2nd Floor, 100 Liverpool Street, London, United Kingdom, EC2M 2AT
    • LinkedIn: www.linkedin.com/company/kyndryl
    • Twitter: x.com/kyndryl

    12. WSO2

    WSO2 helps businesses modernize applications to create seamless digital experiences, with a focus on industries like finance and telecom. Their services aim to simplify complex systems by using cloud-native and AI-driven solutions. By prioritizing open-source technologies, WSO2 ensures applications are flexible and easy to integrate with existing infrastructure.

    Their modernization process often involves building API-driven platforms or integrating identity management systems to enhance security and functionality. WSO2’s approach emphasizes reducing the burden on developers, allowing businesses to focus on creating user-friendly applications. Their use of tools like Choreo supports faster development cycles and ongoing system improvements.

    Key Highlights:

    • Focus on open-source and cloud-native solutions
    • Emphasize API management for better integration
    • Support developer productivity with streamlined platforms
    • Prioritize secure and scalable digital experiences
    • Offer flexible deployment options across cloud and on-premises

    Services:

    • API management
    • Integration services
    • Identity and access management
    • Internal developer platform (Choreo)
    • Application modernization

    Contact Information:

    • Website: wso2.com
    • Phone: +44 203 696 6510
    • Address: WSO2 UK Ltd, Warnford Court, 29 Throgmorton Street, London, EC2N 2AT
    • LinkedIn: www.linkedin.com/company/wso2
    • Facebook: www.facebook.com/OfficialWSO2
    • Twitter: x.com/wso2

    13. HPE

    HPE are assisted in updating their applications by focusing on finding the right mix of cloud and on-premises solutions. Services, often centered around tools like the Right Mix Advisor, aim to align modernization with a company’s specific goals, such as improving efficiency or meeting sustainability targets. By assessing a client’s existing systems, the modernization process is ensured to support their operations without unnecessary disruptions.

    The approach involves a data-driven analysis to map out a clear modernization plan, whether it’s moving applications to the cloud or optimizing existing infrastructure. Flexibility is emphasized, allowing businesses to choose hybrid cloud setups that fit their needs. The work also integrates AI and networking solutions to make systems more responsive and secure, keeping them ready for future challenges.

    Key Highlights:

    • Use data-driven tools for tailored modernization plans
    • Focus on hybrid cloud solutions for flexibility
    • Integrate AI and networking for enhanced performance
    • Prioritize sustainability in IT transformations
    • Emphasize minimal disruption during modernization

    Services:

    • Application modernization
    • Cloud migration
    • Hybrid cloud management
    • Data-driven analysis
    • IT sustainability planning

    Contact Information:

    • Website: www.hpe.com
    • Phone: 0808-164-4441
    • Address: 1 Aldermanbury, London EC2V 7GF, UK
    • LinkedIn: www.linkedin.com/company/hewlett-packard-enterprise
    • Facebook: www.facebook.com/HewlettPackardEnterprise
    • Twitter: x.com/HPE_UKI
    • Instagram: www.instagram.com/hpe

    14. GoodCore

    GoodCore is supported in modernizing legacy software, enabling adaptation to changing market needs. Services concentrate on industries like healthcare and finance, aiming to enhance system performance and accessibility while ensuring compliance with regulations like GDPR. Through close collaboration with clients, solutions are tailored to address specific pain points, such as outdated interfaces or slow processes.

    The modernization process begins with a thorough review of a client’s systems, followed by a clear plan to update or rebuild applications. Smooth transitions are prioritized, using agile methods to minimize disruptions and safeguard data during migration. A focus on user-friendly designs and flexible integrations helps businesses create systems that are easier to use and maintain over time.

    Key Highlights:

    • Emphasize compliance with regulations like GDPR
    • Use agile methods for smooth transitions
    • Focus on user-friendly interfaces
    • Prioritize data safety during migrations
    • Offer flexible integration with existing systems

    Services:

    • Legacy system modernization
    • Custom software development
    • AI integration
    • UX/UI design
    • Cloud migration

    Contact Information:

    • Website: www.goodcore.co.uk
    • Phone: 020 8781 6903
    • Email: contact@goodcore.co.uk
    • Address: Airport House, Purley Way, Croydon CR0 0XZ
    • LinkedIn: www.linkedin.com/company/goodcore-software
    • Facebook: www.facebook.com/goodcoresoftware

    15. Accenture

    Accenture is supported in transforming their legacy applications to remain competitive in a tech-driven world. Services cater to various industries, focusing on creating agile systems that enable new opportunities like generative AI. By assessing a client’s application portfolio, modernization is ensured to align with their business objectives, whether it’s improving efficiency or enabling scalability.

    The approach involves defining a clear architecture and roadmap, often using agile and DevSecOps practices to streamline the process. Flexible modernization pathways, from containerization to mainframe optimization, are offered to suit different needs. The work emphasizes security and efficiency, helping businesses update their systems while keeping operations running smoothly.

    Key Highlights:

    • Use agile and DevSecOps for efficient modernization
    • Offer flexible modernization pathways
    • Focus on aligning IT upgrades with business goals
    • Integrate generative AI for enhanced functionality
    • Prioritize secure and scalable architectures

    Services:

    • Application modernization
    • Mainframe optimization
    • Cloud migration
    • Agile/DevSecOps coaching
    • Application portfolio assessment

    Contact Information:

    • Website: www.accenture.com 
    • Phone: +441215162501
    • Address: Cornerblock, 2 Cornwall Street, Birmingham, West Midlands, United Kingdom, B3 2DX

    Conclusion

    Modernizing your apps doesn’t have to be a headache. The UK’s got a bunch of solid companies ready to help you ditch the old tech and get systems that actually work for you. Whether it’s moving to the cloud, beefing up security, or just making your apps easier to use, these folks know their stuff. They’re not just throwing tech at you-they’re focused on what your business needs to keep things running smoothly and save you some cash in the long run.

    Picking the right company depends on what you’re after. Need to meet strict regulations? Some of these guys specialize in that. Want a system that scales as you grow? They’ve got you. It’s less about the fanciest tech and more about finding a partner who gets your goals and makes your apps work smarter. So, check out their websites, give them a call, and see who feels like the right fit for your business.

     

    Let’s build your next product! Share your idea or request a free consultation from us.

    You may also read

    Artificial Intelligence

    11.09.2025

    Top System Diagnostics Companies in the UK

    When your systems start glitching or slowing down, it can feel like you’re flying blind. That’s where system diagnostics companies come in. These are the people who dig into the details, find out what’s really going on under the hood, and fix issues before they turn into something bigger (and usually more expensive). Across the […]

    posted by Apollinaria Dvor

    Artificial Intelligence

    11.09.2025

    Best UI Design Companies in the UK for Digital Products

    If you’ve ever tapped an app or scrolled through a site and thought, “This just feels right,” you’ve experienced good UI design in action. Behind that ease and flow is a team that knows how to make digital tools not just look nice, but actually work for people. In the UK, there’s no shortage of […]

    posted by Apollinaria Dvor

    Artificial Intelligence

    11.09.2025

    Top UX Design Companies in the UK

    Good UX design is no longer a “nice-to-have” ; it’s the backbone of how people interact with products and services. In the UK, a growing number of design studios and digital agencies are dedicated to creating seamless, intuitive experiences that keep users engaged and businesses competitive. From small, niche studios to larger teams working with […]

    posted by Apollinaria Dvor