Software modernisation is the process of updating legacy and outdated software with newer software, frameworks, and infrastructure. It is also known as application modernisation or legacy software modernisation. The main advantage of software modernisation is to improve security, add features, or to connect to other systems. Modernising software means extending its lifespan instead of retiring it and developing or migrating to a new piece of software.

Many businesses, both small and large, have come across challenges to their businesses due to limitations of outdated software. Some of the issues faced include:

• Security risks
• Inefficient process
• Lack of integration and software connections
• Unstable software
• Costly maintenance and upkeep
• Older version needs an update

Depending on certain situations and for specific requirements, it may be recommended to rehost, re-platform, or completely replace a system, each with its own pros and cons to consider.

Software modernisation methods

Common methods of software modernisation include:

Lift-and-shift: This involves taking the existing software or application and migrating from its environment to a newer infrastructure; an example of this could be from on-premises to cloud. This method ensures that the application is only moved without making significant changes to its code or architecture. As such, it equates to a relatively simple process, depending on the complexity of the software.

Re-factoring: This method consists of rewriting parts of the underlying code of the software, so it can run effectively in a new environment, typically the cloud. It may also involve restructuring the existing code to ensure it will work as intended in the new location. Refactoring is a common method for expansive amounts of code that need to be broken down into smaller “chunks”, this is referred to as microservices.

Re-platforming: This method is considered in between lift-and-shift and refactoring as it does not require major changes to the software code, as is the case with refactoring, but requires updates to be made. These updates would then enable the legacy software to take advantage of a cloud platform and enhance current capabilities.