Free E-book · Modernisation
The Legacy Modernisation Roadmap
How to assess an ageing system, choose a strategy and move forward without breaking the business.
A practical roadmap for technology leaders who depend on a legacy application. It covers how to assess risk, choose between rehosting, refactoring and rebuilding, put a safety net in place, move data safely and measure whether the programme is working.
What you will learn
- Measure the real cost and risk of the current system
- Choose between rehost, replatform, refactor, rearchitect and rebuild
- Build tests, monitoring and release routines before changing core code
- Replace a system gradually instead of with a risky big-bang rewrite
- Move data with checks at every stage
- Track progress with a handful of outcome measures
What is inside
- Is it really a problem?Questions that separate a working old system from a risky one.
- Map what you haveBuild a shared picture of components, data and integrations.
- Choose a strategy for each partFive options, from moving the system to rebuilding it.
- Build the safety netTests, releases, monitoring and rollback before touching the core.
- Replace graduallyThe strangler approach, one capability at a time.
- Move the dataSource of truth, replication, checks and a rehearsed cutover.
- Measure and keep goingOutcome measures that show whether the programme is working.
Who it is for
- CTOs and heads of engineering responsible for ageing systems
- Operations leaders who rely on software they cannot easily change
- Teams planning a migration or replatforming project