Modernizing legacy systems is rarely just about swapping old tech for new. It’s usually a mix of untangling what’s been patched together over the years, figuring out what still works, and deciding what’s holding everything back. In the UK, a growing number of companies are tackling this challenge head-on, helping businesses shed outdated infrastructure without grinding daily operations to a halt.
This article looks at some of the key players in that space. They’re not just dropping in shiny new platforms, but actually working with teams to rethink processes, clean up technical debt, and bring legacy setups into the modern world. Whether you’re stuck with old mainframes, clunky internal tools, or hard-to-maintain code, these companies offer different ways to move forward without breaking everything in the process.
1. A-listware
At A-listware, we focus on helping companies move on from outdated systems that no longer support their goals. Legacy modernization isn’t just about swapping out old code for new tech. It’s about understanding how things work today, where the bottlenecks are, and what a more flexible and resilient setup might look like. Our teams in UK work directly with clients to rethink and rebuild their systems so they can be more scalable, easier to maintain, and better aligned with current business processes.
We’re used to handling projects that come with unknowns. Sometimes the documentation is missing or incomplete, or the original team is long gone. That’s fine. We work alongside you to understand what’s really needed, break things down into manageable parts, and steadily improve the system without disrupting daily operations. Whether it’s re-platforming, rewriting, or carefully untangling a legacy app, we treat modernization as an ongoing collaboration, not a one-time fix.
Key Highlights:
- Full-cycle legacy system modernization and platform migration
- Long-term support through dedicated teams and project supervisors
- Real-world experience with cloud-native architecture and DevOps
- Integration with both cloud and on-prem infrastructure
- Transparent communication and direct access to engineers
Services:
- Legacy Software Modernization
- Cloud Application Development
- Custom Software Development
- Infrastructure Management
- IT Consulting and Digital Transformation
- Dedicated Engineering Teams
- UX/UI Redesign for legacy systems
- QA and Testing for updated platforms
Contact Information:
- Website: a-listware.com
- Phone: +44 (0)142 439 01 40
- Email: info@a-listware.com
- Address: St. Leonards-On-Sea, TN37 7TA, UK
- LinkedIn: www.linkedin.com/company/a-listware
- Facebook: www.facebook.com/alistware
2. TXP
TXP works with businesses and public sector organisations that are ready to move away from outdated systems but need a practical path forward. Their approach to legacy modernisation blends technical experience with a clear understanding of how people interact with technology day to day. Instead of ripping everything out and starting from scratch, they focus on revitalising what’s already there, making it more agile and ready to scale without disrupting the way people work.
They don’t treat modernisation as a one-size-fits-all project. Whether the challenge is migrating to the cloud, untangling years of technical debt, or updating user interfaces that no one wants to give up, TXP meets organisations where they are. Their team steps in to fill the gap left by vanishing legacy expertise and helps teams work through both technical transitions and human resistance. Security, usability, and process alignment stay at the center, with everything designed to reduce risk and keep momentum steady.
Key Highlights:
- Revitalises legacy systems with minimal disruption
- Combines consulting and engineering for tailored solutions
- Helps teams navigate cloud migration with clarity
- Focuses on user experience during modernisation
- Addresses risk, governance, and security throughout the process
Services:
- Legacy Application Modernisation
- Cloud-enabled System Migration
- UX and UI Optimisation
- Risk and Compliance Management
- Agile Delivery Frameworks
- AI-supported Automation through ModeX
- Mainframe Modernisation
- Strategic Technology Consulting
Contact Information:
- Website: www.txp.co.uk
- Facebook: www.facebook.com/txptechnologyxpeople
- LinkedIn:www.linkedin.com/company/txp-technology-x-people
- Instagram: www.instagram.com/txp_technologyxpeople
- Address: Jumar House, Pinewood Business Park, Coleshill Road, Solihull, West Midlands B37 7HG, GB
- Phone: +441217884550
3. PSP IT
PSP IT focuses on helping organisations upgrade legacy systems without tossing everything out and starting over. They’ve been working in this space since the late 2000s and tend to take a measured, code-conscious approach. Instead of recommending full rebuilds by default, they look at what can be improved, what should stay, and how different pieces of old infrastructure can be brought into line with current standards. Their work often involves dealing with disconnected systems and siloed data, and they’re used to finding ways to make things work together more smoothly.
They also handle things like unsupported platforms, outdated programming languages, and outdated interfaces. For organisations still running systems built on things like Visual Basic, older versions of PHP or .NET, PSP can step in and extend their lifespan or gradually transition them. They place equal focus on maintaining data continuity and improving the user experience. Their aim is to avoid major disruption while still giving teams something that’s faster, easier to use, and ready to plug into modern tools.
Key Highlights:
- Focuses on reworking existing systems instead of full rebuilds
- Helps unify siloed data and disconnected software
- Experienced with older stacks like VB6, PHP, and Oracle
- Revamps UI without breaking working backend logic
- Supports integration with newer third-party applications
Services:
- Legacy System Modernisation and Support
- User Interface and Experience Updates
- Codebase Migration and Upgrades
- Data Integration and Consolidation
- Bug Fixing and Performance Improvements
- Automated Testing for Legacy Systems
- Digital Transformation Consulting
- Partial or Full System Rebuilds on Request
Contact Information:
- Website: psp-it.com
- E-mail: letstalk@psp-it.com
- Address: Carver House, Apex Court, Elsoms Way, Spalding, Lincolnshire, PE11 3UL
- Phone: 01775722377
4. RVS Media
RVS Media works with businesses that need to bring their legacy systems in line with modern infrastructure without causing unnecessary friction. Their focus is mainly on small and mid-sized organisations looking to stay relevant in fast-moving digital spaces. Instead of applying a single fix across the board, they take time to understand what a system is doing, what it still does well, and how it could be restructured or replaced to support long-term growth. Whether it’s aging web platforms, old APIs, or out-of-date business software, they approach modernisation with flexibility and attention to existing operations.
They support companies in transitioning to cloud-based environments, improving system performance, and integrating tools that previously operated in silos. Beyond just updating software, they offer re-engineering options for businesses that want to hold on to certain processes while cleaning up the code underneath. They also support digital transformation projects that include automation, integration, and design upgrades. Overall, their work is about making systems more useful and less of a maintenance headache while helping businesses adapt without overcomplicating the shift.
Key Highlights:
- Tailors legacy modernisation to small and mid-level business environments
- Provides support for system upgrades, redesign, and cloud migration
- Focuses on integrating siloed tools and simplifying system communication
- Offers re-engineering for older software to improve maintainability
- Prioritises performance, security, and long-term system flexibility
Services:
- Application and Website Modernisation
- Cloud Migration for Legacy Platforms
- API and System Integration
- Software Re-Engineering
- UI and UX Modernisation
- Digital Transformation Strategy
- Security and Performance Optimisation
- Dedicated Team Hire for Legacy Projects
Contact Information:
- Website: www.rvsmedia.co.uk
- E-mail: hello@rvsmedia.co.uk
- Facebook: www.facebook.com/rvsmediauk
- LinkedIn: www.linkedin.com/company/rvs-media-ltd
- Instagram: www.instagram.com/rvsmedia
- Address: White Collar Factory, 1 Old Street Yard, London EC1Y 8AF
- Phone: 0203 355 8081
5. Digitice
Digitice works with companies looking to move away from outdated systems that are holding them back. They handle legacy system modernization with a focus on minimising disruption while getting real improvements in performance, security, and scalability. Their approach usually starts with a detailed assessment of what’s already in place, followed by a plan that suits how the business actually runs. Rather than pushing a full rebuild by default, they aim to upgrade systems in ways that keep operations going while gradually introducing better tech.
They support everything from code refactoring and system re-engineering to cloud migration and API development. What stands out is their willingness to work through older systems that still play a central role but need help catching up with current demands. Integration with newer tools, boosting security, and keeping everything compliant are all part of the process. They’re also clear about adapting to each organisation’s structure, whether it’s a hybrid environment or a setup with heavy third-party dependencies.
Key Highlights:
- Focused on reducing disruption during modernization
- Handles both small refactors and full cloud transitions
- Offers support for hybrid and multi-cloud systems
- Prioritizes compliance and up-to-date security standards
- Works with businesses to assess and plan upgrades based on real usage
Services:
- Legacy System Assessment and Strategy
- Cloud Migration and Infrastructure Modernization
- Application Re-Engineering and Code Refactoring
- API Development and System Integration
- Security and Compliance Upgrades
- Custom Development for Legacy Replacement
- Ongoing Support and Maintenance
Contact Information:
- Website: godigitice.com
- E-mail: godigitice@gmail.com
- Facebook: www.facebook.com/people/Kea-Castle-Technol
- Twitter: x.com/thekeacastle/
- LinkedIn: www.linkedin.com/company/keacastle
- Instagram: www.instagram.com/keacastle_official
- Phone: +447787388887
6. Shinetech Software
Shinetech Software helps businesses move their legacy systems into the present without disrupting what already works. Their approach is hands-on and grounded in real project experience across industries like healthcare, logistics, finance, and education. They begin by looking closely at the current setup to figure out which parts can be improved, restructured, or replaced, and they don’t shy away from technical debt. Instead of pushing for a full rebuild, they work out what’s worth keeping and what needs to evolve to meet modern standards.
Their modernization process touches everything from reworking outdated application logic to improving system architecture, updating tech stacks, migrating to the cloud, and making interfaces more usable. They also pay attention to backend performance and frontend experience, whether that means converting a legacy desktop app into a mobile-ready web app or rebuilding backend services using more maintainable frameworks. Shinetech tends to stay involved beyond the initial delivery, offering ongoing support and updates as systems evolve with the business.
Key Highlights:
- Practical approach to modernizing without starting from scratch
- Works across industries with legacy systems of varying complexity
- Focus on backend performance and frontend usability
- Helps with cloud transitions and scalable infrastructure planning
- Offers ongoing support after modernization is complete
Services:
- Legacy Application Re-Engineering
- Technology Stack Updates
- Cloud Migration and Infrastructure Setup
- Data Migration and Integration
- Frontend Modernization with Modern UI Frameworks
- Mobile Optimization and Native App Support
- Modernization Strategy Planning
- Ongoing Maintenance and Support
Contact Information:
- Website: www.shinetechsoftware.co.uk
- E-mail: salesuk@shinetechsoftware.com
- Facebook: www.facebook.com/people/Shinetech-Software-Inc/61565142935993
- Twitter: x.com/Shinetechglobal
- LinkedIn: www.linkedin.com/company/shinetech-software-inc-
- Address: 8 Devonshire Square, London, EC2M 4PL, United Kingdom
- Phone: +442032866293
7. Quinnox
Quinnox supports legacy system modernization through a structured, tech-agnostic approach that focuses on minimizing risk while improving agility. They help organizations shift from complex, outdated systems toward scalable, modern infrastructures that are easier to maintain and integrate. Their work usually starts with a clear analysis of the existing setup, looking at infrastructure, code, and dependencies to uncover what needs to be fixed or replaced. The company emphasizes modular architecture, intelligent automation, and compliance to align modern systems with future business demands.
Using their Qinfinite framework, they help teams move away from high-maintenance systems by introducing cloud-ready platforms, automation, and real-time integration. They also support application maintenance, custom development, and testing services to ensure that the changes work long-term. Whether the goal is faster feature rollout, improved security, or smoother operations, they focus on making transitions as practical as possible for businesses across sectors like finance, insurance, logistics, and energy.
Key Highlights:
- Offers structured modernization using their Qinfinite platform
- Focuses on reducing maintenance costs and improving system agility
- Uses automation tools to analyze code and infrastructure
- Supports modular architecture and future-ready system design
- Applies consistent compliance and risk assessments throughout the process
Services:
- Legacy Code and Infrastructure Assessment
- Application Re-Engineering and Maintenance
- Cloud-Ready System Transformation
- Automated Data Migration and Validation
- Integration with Knowledge Graphs and APIs
- Platform and Architecture Modernization
- Custom Testing and QA Services
- Ongoing Support and Digital Operations
Contact Information:
- Website: www.quinnox.com
- E-mail: verifications@quinnox.com
- Facebook: www.facebook.com/QuinnoxInc
- Twitter: x.com/QuinnoxInc
- LinkedIn: www.linkedin.com/company/quinnoxinc
- Address: 9 St Clare St, London EC3N 1LQ
- Phone: +44 (0) 20 45205810
8. Limeup
Limeup works with companies that are ready to let go of outdated systems but need to do it without shutting everything down in the process. Instead of just slapping updates on top of old code, they take the time to understand what’s still working, what isn’t, and how to move things forward without making a mess. Their team gets involved in everything from system performance tweaks to giving old platforms a more modern feel and functionality. Whether it’s a clunky mobile app, slow internal tools, or disconnected software, they try to bridge the gap without adding unnecessary complexity.
They don’t rush into it either. The process usually starts with a full technical audit, followed by a plan that fits how the business actually runs. Some projects involve reworking architecture, others need app refactoring, and sometimes it’s about integrating newer features while keeping the bones of the old system intact. Limeup’s goal is to make systems easier to maintain, more user-friendly, and ready to grow with the business. And because they work across industries like real estate, logistics, and healthcare, they’ve seen all kinds of legacy messes and know how to clean them up without making things worse.
Key Highlights:
- Experienced with legacy systems in multiple sectors
- Prioritizes long-term performance and system usability
- Supports the full modernization process from audit to rollout
- Special focus on mobile app and UI improvements
- Helps reduce complexity and lower operational costs
Services:
- Legacy software and mobile app upgrades
- Data migration and integration with new tools
- Architecture redesign and performance tuning
- Cross-platform development and modernization
- Tailored modernization strategies
- Ongoing system support and updates
Contact Information:
- Website: limeup.io
- E-mail: hello@limeup.io
- Facebook: www.facebook.com/limeup.io
- LinkedIn: www.linkedin.com/company/limeup
- Address: Queens House, 180 Tottenham Ct Rd, London W1T 7PD
- Phone: 442081356600
9. Andersen
Andersen works with businesses that are stuck running older systems that just don’t keep up anymore. They don’t jump straight into rebuild mode though. Instead, they take a step back, figure out what the software is still doing right, and then decide how to fix what’s not. Sometimes that means tweaking the code, other times it’s a full replatforming. Either way, they aim to make everything work better with today’s tools and expectations without throwing the whole thing out.
They also help companies with data migration, system integration, and updating things like compliance and security standards. Their approach is flexible, depending on how critical the system is and how much tech debt has piled up over the years. The goal is to modernize without adding new headaches. They’re not trying to reinvent the wheel, just get it rolling smoother. Whether it’s fixing backend issues or making old systems play nice with new platforms, Andersen focuses on keeping risk low while making sure the upgrades actually stick.
Key Highlights:
- Handles anything from partial fixes to full system overhauls
- Uses strategies like rehosting, replatforming, or refactoring
- Focuses on cutting down tech debt and improving integration
- Helps with API development for legacy extension
- Covers compliance updates and security improvements
Services:
- Legacy system review and advisory
- App modernization and platform migration
- Data cleanup and migration
- Microservices transformation
- API and integration updates
- Change management and QA testing
Contact Information:
- Website: andersenlab.com
- E-mail: vn@andersenlab.com
- Facebook: www.facebook.com/AndersenSoftwareDev
- Twitter: x.com/AndersenLabs
- LinkedIn: www.linkedin.com/company/andersen-lab
- Instagram: www.instagram.com/andersen.global
- Address: 30 St Mary’s Axe, London, EC3A 8BF, UK
- Phone: +44 207 048 6755
10. Chetu
Chetu works with companies that are still relying on old systems but know it’s time for an upgrade. The thing is, a lot of these older platforms still do important stuff, so the challenge is figuring out how to modernize without breaking what’s already working. That’s where Chetu comes in. They help clean up legacy code, migrate data, update old interfaces, and move entire systems onto newer tech stacks when needed. It’s not always a total overhaul, sometimes it’s just about improving what’s already there.
What stands out is their experience with older languages and platforms that most people don’t touch anymore – things like COBOL, Pascal, ColdFusion, and even Delphi. They help companies move from those environments to more modern ones like .NET or Java, often adding mobile or web functionality along the way. Whether it’s upgrading an old GUI, converting a database, or getting two systems to talk to each other, Chetu handles the messy in-between stage so businesses can actually move forward.
Key Highlights:
- Offers both system upgrades and full migrations
- Works with legacy languages like COBOL, Pascal, and Delphi
- Supports GUI redesign and modern interface updates
- Helps move systems from outdated platforms to newer tech
- Adds mobile and web integrations to older setups
Services:
- Legacy system upgrade and retirement planning
- Manual and automated migration
- Code modernization and UI enhancements
- Data conversion and validation
- Application refactoring and integration support
- Architecture updates and SOA integration
Contact Information:
- Website: www.chetu.com
- E-mail: sales@chetu.com
- Facebook: www.facebook.com/ChetuInc
- Twitter: x.com/ChetuInc
- LinkedIn: www.linkedin.com/company
- Address: 83 Hagley Road, Part 1 First Floor Birmingham, B168QG United Kingdom
- Phone: +44 137 243 2466
11. Urolime
Urolime helps businesses move away from outdated software without turning everything upside down in the process. They don’t just dive in and start rewriting code. First, they take a close look at what’s actually running, what’s critical to day-to-day work, and where things are starting to fall apart. From there, they put together a realistic plan that lays out what should be refactored, replaced, or just migrated to something cleaner. The goal isn’t to disrupt, it’s to make the transition as smooth and low-stress as possible.
They often work in steps rather than trying to do everything at once. Some apps get broken down into microservices, others are moved to container-based platforms, and a lot of it involves improving performance and making the system easier to manage going forward. They also help with things like retiring old software, moving data, and making sure everything still lines up with how the business operates. It’s not just about modernizing, it’s about making sure the new setup actually fits.
Key Highlights:
- Builds step-by-step modernization plans based on real business use
- Uses containers, automation, and cloud tools to improve flexibility
- Aims for low downtime and minimal operational disruption
- Supports data migration and sunsetting of older platforms
- Brings DevOps practices into modernization efforts
Services:
- Legacy application modernization
- Cloud migration and infrastructure upgrades
- Technical audits and planning
- Refactoring using modern platforms
- Microservices and container deployment
- Data migration and downsizing
Contact Information:
- Website: www.urolime.com
- Facebook: www.facebook.com/UROLIME
- Twitter: x.com/Urolime
- LinkedIn: www.linkedin.com/company/urolime
- Address: 950 Great West Road Profile West, Brentford, England, TW8 9ES
- Phone: +44 (020) 8050 6023
12. Simplified Solutions
Simplified Solutions helps companies in the UK deal with legacy software that’s become more of a burden than a help. These are the kinds of systems that still run the business but are clunky, hard to update, and often not great when it comes to user experience or security. What they do is step in, figure out where the weak spots are, and start bringing those systems up to speed. They put a strong focus on compliance and security, which is especially important for industries like finance, insurance, and government.
Their process usually kicks off with a deep dive into the system to spot performance issues and outdated components. From there, they start modernizing, that might mean rebuilding part of the application, moving it to the cloud, or redesigning the interface so it’s easier for people to use. They also use tools like Docker and Kubernetes to make the infrastructure more scalable and easier to manage. The big picture goal is to help companies stay secure, efficient, and ready to grow without having to completely reinvent everything.
Key Highlights:
- Upgrades legacy systems with better security, design, and performance
- Uses containerization and CI/CD tools for scalable modern infrastructure
- Focuses on compliance and secure development practices
- Tailors each modernization project to the company’s actual workflows
- Helps reduce downtime and improve long-term usability
Services:
- Legacy app modernization and redesign
- Cloud migration and infrastructure upgrades
- Secure development lifecycle consulting
- Data migration and architecture updates
- Performance reviews and system audits
- Cybersecurity integration and governance improvements
Contact Information:
- Website: simplifiedsol.co.uk
- E-mail: contact@simplifiedsol.co.uk
- Twitter: x.com/simplified_sol
- LinkedIn: www.linkedin.com/company/simplified-solutions-uk
- Address: Sunbury On Thames, London TW16 7TG
- Phone: +44 7443 934432
13. Luxoft
Luxoft works with companies that need to move away from outdated systems but can’t afford to lose the important stuff those systems still do. A lot of what they handle is pretty complex – think mainframes running COBOL, IMS databases, or old CA Gen setups. Instead of applying a cookie-cutter fix, they start by mapping out what’s actually in place, how all the pieces fit together, and what needs to be modernized without breaking things that are still mission-critical.
Their team doesn’t just swap out tools and hope for the best. They use their own tools and a pretty structured process to assess systems, figure out dependencies, and create a plan that doesn’t throw anyone into chaos. Whether that’s rewriting legacy code into something more flexible like Python, setting up CI/CD pipelines, or just helping a company get off expensive license-heavy platforms, they aim to make the shift realistic. And because they work closely with both IT and leadership early on, there’s less backtracking later.
Key Highlights:
- Specializes in complex legacy systems like COBOL, IMS, and CA Gen
- Avoids vendor lock-in with license-free, cloud-friendly solutions
- Creates practical modernization plans with real timelines
- Builds custom tools to support deep system analysis
- Automates testing and deployment with CI/CD workflows
Services:
- Legacy system assessment and roadmap planning
- Mainframe migration and modernization
- Code transformation and compiler optimization
- Tool development for modernization projects
- QA automation and CI/CD setup
- Infrastructure upgrades and performance tuning
Contact Information:
- Website: www.luxoft.com
- Facebook: www.facebook.com/Luxoft
- Twitter: x.com/Luxoft
- LinkedIn: www.linkedin.com/companies/luxoft
- Address: EC2V 7HR, One Aldermanbury Square EC2V 7HY, London
- Phone: +44 207 993 0737
14. Bacancy
Bacancy helps businesses move on from legacy systems that have become slow, expensive, or just too frustrating to deal with. They don’t force a full rebuild right out of the gate. Instead, they look at what’s working, what’s outdated, and what kind of update makes the most sense, whether that’s rehosting, breaking things into microservices, or rebuilding specific parts from scratch. Their teams work with older tech like COBOL and Pascal, helping companies shift to more modern, cloud-based platforms without losing the parts of the system that still matter.
They also handle things like outdated APIs, clunky interfaces, and missing DevOps practices. Most of their projects start with a system audit to get a clear view of where things stand, and then they move into phased updates so the whole thing doesn’t grind to a halt. Their goal is to reduce tech debt without creating a ton of disruption. Whether it’s redesigning the backend, cleaning up old code, or setting up CI/CD pipelines, Bacancy helps businesses get their systems in shape so they can actually move forward again.
Key Highlights:
- Updates legacy systems with flexible approaches like refactoring or rehosting
- Helps transition older stacks into scalable, cloud-based platforms
- Converts monolithic systems into modular microservices
- Adds modern UI/UX and DevOps support
- Focuses on phased rollouts to avoid downtime
Services:
- System audit and modernization planning
- Software reengineering and redesign
- Cloud migration and infrastructure setup
- API upgrades and system integration
- CI/CD implementation and DevOps support
- Long-term maintenance for modernized platforms
Contact Information:
- Website: www.bacancytechnology.com
- E-mail: solutions@bacancy.com
- Facebook: www.facebook.com/BacancyTechnologyLimited
- Twitter: twitter.com/BacancyTech
- LinkedIn: www.linkedin.com/company/bacancy-technology
- Instagram: www.instagram.com/bacancytechnology
- Address: 90 York Wy, London N1 9AG
Conclusion
Modernizing legacy systems isn’t just a matter of swapping old code for something new. It’s often a tangled process of figuring out what’s still working, what’s holding things back, and how to make that transition without breaking what people rely on every day. The companies covered in this article approach that challenge from different angles, whether it’s through re-architecting, refactoring, or just helping teams let go of tech that’s been around a bit too long.
What stands out is how varied the paths to modernization can be. Some firms go deep into infrastructure, others focus on breaking monoliths apart or bringing in automation where it makes sense. There’s no single fix that works for every business, and honestly, that’s kind of the point. Legacy systems carry years of history, logic, and context. The real skill lies in helping organizations move forward without losing what made those systems valuable in the first place.
