Modernising legacy software with AI, cloud and SaaS

Legacy software has long been the backbone of many organisations, providing critical functionality and holding valuable data. As technology evolves, though, these ageing systems can limit an organisation's ability to adapt to new challenges and opportunities.

Legacy software modernisation is the process of turning outdated, often monolithic and inefficient systems into more flexible, scalable and cost-effective ones, using modern technologies and architectures.

What drives modernisation

• Business agility: legacy systems struggle to keep pace with the digital age. Modernisation helps organisations respond to market conditions, customer needs and competitive threats.
• Cost optimisation: maintaining and supporting legacy systems can be expensive and take a large share of IT budgets. Modernisation can cut operating costs and free resources for strategic work.
• Improved user experience: legacy systems often have outdated interfaces and limited functionality, which frustrates users. Modernisation allows intuitive applications that improve productivity and satisfaction.
• Enhanced security: older systems may lack the security features needed against modern threats. Modernisation brings current security measures and reduces the risk of breaches and compliance violations.
• New technologies: modernising opens the door to cloud computing, artificial intelligence and machine learning.

Approaches to modernisation

• Rehosting: also called "lift and shift". Systems move to new hardware or a cloud platform with minimal change to the application. It is often the fastest and least disruptive route, but it may not fix underlying architectural problems.
• Refactoring: improving the internal structure of the code without changing its external behaviour. This can improve performance, maintainability and scalability without a full rewrite.
• Rearchitecting: redesigning the underlying architecture, often by breaking the system into smaller, more manageable components or services. This enables greater flexibility, scalability and integration with modern technology.
• Rebuilding: rewriting the system from scratch with modern technologies and architectures. It offers the most room for innovation but is the most time-consuming and resource-intensive.
• Replacing: swapping the system for a commercial off-the-shelf product or a SaaS offering. This gives access to the latest features without extensive customisation or maintenance.

Benefits of modernisation

• Improved efficiency: streamlined systems automate processes, reduce manual work and remove bottlenecks.
• Better customer experience: more intuitive, responsive and personalised experiences can raise satisfaction, loyalty and revenue.
• Competitive advantage: current technology and architecture help an organisation stand out.
• Reduced risk: modern systems are less exposed to security threats, compliance issues and failures, which lowers the risk of costly downtime.
• Scalability: modern cloud-based architectures can scale up or down as demand changes.

Conclusion

Modernisation is not a one-time event but an ongoing process of adapting to changing needs. Whether through rehosting, refactoring, rearchitecting, rebuilding or replacing, it offers a path to greater efficiency, agility and competitiveness. Working with experienced partners and following best practices helps organisations handle the challenges along the way.

Talk to us

If you are weighing up how to modernise a legacy system, see our cloud and DevOps services or contact us.