Legacy Software Modernisation

Outdated software can slow your business down, introduce security risks, and limit scalability. Our Legacy Software Development services help you upgrade, migrate, and modernise your existing systems—enhancing performance, security, and compatibility with the latest technologies.

Whether you need to update an internal business application, migrate a SaaS platform, modernise a mobile app, or ensure compliance with security standards, our expert developers handle everything from framework upgrades to cloud migrations. We work with a wide range of technologies, ensuring seamless transitions and minimal disruptions to your operations.

When dealing with legacy systems, we believe that a steady, iterative approach to development is the optimal way forward. While this does mean that no great UI changes will immediately be made apparent, we make gradual under-the-bonnet improvements that can give your products new life.

Stay ahead of the curve—upgrade your legacy software with confidence.

Software Upgrade

Internal Software Systems

Keeping internal software systems up to date is essential for maintaining operational efficiency, security, and compliance. Whether your organisation needs to upgrade a legacy enterprise system, update outdated software infrastructure, or modernise a custom internal application, our team provides tailored solutions to enhance system performance and reliability. We offer expertise in internal tool updates and business software upgrades to the latest versions, ensuring seamless transitions with minimal disruption to your operations.

Upgrade legacy enterprise system

Internal tool update

Outdated software infrastructure

Business software upgrade

Custom application update

SaaS or Web-based Solutions

Ensuring that SaaS and web-based applications remain secure, scalable, and efficient is crucial for business continuity. Our services include upgrading cloud-based applications to new versions, migrating SaaS apps to modern technology stacks, and refactoring outdated web applications to improve performance and maintainability. Our team specialises in upgrading web portals to modern architectures and enhancing existing platforms, ensuring a seamless transition with minimal service disruption.

Cloud application upgrade

SaaS app migration

Refactor old web app

Web portal modernisation

Software Migration & Data Porting

Version-to-version Migration

Upgrading applications to the latest frameworks ensures better performance, security, and long-term support. Our team provides expert assistance to migrate apps to the latest framework, whether it involves moving a Java 8 application to Java 21, upgrading a legacy .NET system to .NET 8, or updating a Python 2 script to Python 3.12. We also specialise in migrating from AngularJS to Angular 14, ensuring smooth transitions with minimal downtime while maintaining application stability and functionality.

App framework migration

AngularJS to Angular 14

Legacy .NET to .NET 8

Java 8 to Java 21

Python 2 to 3.12 update

Platform Change

Migrate on-premise to cloud

Windows to Linux migration

Port desktop to mobile

Monolith to microservices

Looking for Legacy Software Modernisation in the UK?

You’ve found it! SPG is fully equipped and waiting to hear what you have in mind, and we can’t wait to turn your ideas into a reality.

Mobile App Upgrade

Version Upgrade

Keeping mobile applications up-to-date is essential for maintaining compatibility, performance, and security. Our team provides expertise in upgrading iOS apps to support iOS 17, ensuring your app runs smoothly on the latest Apple devices. We also assist with SDK upgrades for Android apps, ensuring they remain compatible with the newest features and tools. Additionally, we help update Flutter apps to the latest stable version and migrate React Native apps to Expo 50, ensuring your mobile solutions are always optimised for the latest technologies.

iOS app upgrade to iOS 17

Android SDK upgrade

Flutter app update

React Native to Expo 50

Dependencies and API Updates

Ensuring your mobile apps are compatible with the latest technologies is crucial for performance and security. We help fix deprecated APIs in Android apps, ensuring your app continues to function seamlessly with updated libraries and tools. Our team also provides expert support in updating third-party libraries within your mobile app to maintain compatibility with new versions and enhance functionality. Additionally, we specialise in upgrading iOS apps to Swift 5.9 and Xcode 15, ensuring your app is optimised for the latest iOS features and improvements.

Fix deprecated APIs

Update third-party libraries

iOS app upgrade to Swift 5.9

Security and Compliance Updates

Protecting your software from vulnerabilities and ensuring compliance with industry standards is critical for safeguarding your data and reputation. We can help you patch software vulnerabilities by hiring expert developers who specialise in securing custom software. Our team also offers support in applying security updates to keep your systems protected. If your software needs to align with regulations such as GDPR or ISO 27001, we provide assistance in updating libraries for compliance. Additionally, we can update outdated encryption algorithms in legacy apps and conduct a thorough software audit and upgrade for cybersecurity compliance, ensuring your systems meet the highest security standards.

Patch software vulnerabilities

Apply security updates

Update libraries for compliance

Upgrade encryption algorithms

Software audit for compliance

Frontend Modernisation

Modernising your frontend is key to improving user experience, performance, and scalability. Our team specialises in redesigning and upgrading outdated web UIs, giving them a fresh, user-friendly design while enhancing functionality. If you’re looking to modernise your frontend from jQuery to React, we can help transition to a more efficient and scalable framework. We also offer expertise in rebuilding legacy dashboards with Vue.js, creating responsive and dynamic interfaces. Additionally, we help upgrade Bootstrap 3 apps to Bootstrap 5, ensuring your application stays aligned with the latest web design standards and best practices.

Redesign outdated web UI

Modernise frontend to React

Rebuild dashboard with Vue.js

Upgrade Bootstrap 3 to 5

Looking Legacy Software Modernisation in the UK?

API Versioning and Integration Upgrades

Keeping your app compatible with the latest API versions is crucial for ensuring seamless functionality and integration. Our team can upgrade your app to support new API versions, ensuring it stays up-to-date with the latest features and performance enhancements. We also provide assistance in integrating with updated third-party APIs, ensuring smooth communication between systems. If you’re transitioning to a more efficient architecture, we offer expertise in refactoring software for REST to GraphQL migration. Additionally, we help resolve API version mismatches, providing the expertise needed to fix integration issues and maintain a smooth, uninterrupted user experience.

Support new API version

Integrate with updated API

Migrate from REST to GraphQL

Fix API version mismatch

Database Upgrades

Upgrading and modernising your database systems is essential for performance, scalability, and security. Our team specialises in upgrading MySQL 5.6 databases to 8.0, ensuring better performance and enhanced features. We also provide expertise in migrating SQL Server 2012 to Azure SQL, helping you leverage the benefits of the cloud. If your database schema needs a refresh, we can refactor legacy database schemas to improve efficiency and support modern applications. Additionally, we offer data migration assistance for PostgreSQL upgrades, ensuring a seamless transition with minimal disruption to your business operations.

Upgrade MySQL to 8.0

Migrate SQL Server to Azure

Refactor legacy database schema

PostgreSQL upgrade migration

Environment & DevOps Upgrades

Enhancing your development environment and DevOps practices is crucial for improving efficiency, automation, and scalability. We specialise in upgrading Jenkins pipelines to support new build tools, ensuring smoother and faster deployments. Our team also provides updates to Docker images for legacy services, optimising your containerised applications for better performance. If you’re looking to modernise your CI/CD workflow for legacy projects, we offer tailored solutions to streamline development and deployment processes. Additionally, we help migrate deployment scripts from Bash to Ansible, automating infrastructure management and reducing manual errors for more reliable deployments.

Upgrade Jenkins pipeline

Update Docker images

Modernise CI/CD workflow

Migrate scripts to Ansible

Case Studies

At SPG, we take pride in modernising legacy software for businesses of all sizes. From SMEs to large corporations seeking expert software modernisation services in the UK, we are a trusted partner for companies both locally and internationally. Our experienced developers specialise in upgrading, refactoring, and transforming outdated systems, ensuring they meet modern performance, security, and scalability standards.

Our case studies highlight a diverse portfolio of legacy software modernisation projects, demonstrating our expertise in revitalising business-critical applications. With a commitment to delivering measurable improvements and exceeding client expectations, we continue to strengthen our reputation as a leading provider of legacy software modernisation services.

If you’re interested in our past projects, take a look at our featured case studies!