Moving your legacy systems to the cloud without breaking them
Cloud migration fails when it is treated as an overnight event. Someone picks a weekend, copies the database, points DNS at the new servers and hopes. By Monday the business is either migrated or in an incident.
We run migration as a programme, not a switch. Here is the shape of it.
Why overnight migrations fail
Legacy systems carry knowledge that is not written down — scheduled tasks, hard-coded paths, an integration someone set up years ago and forgot. An overnight cutover gives you no time to discover these, and no safe way to go back when you do.
The business also cannot absorb the disruption. Downtime is costly, and a failed migration during a working day is worse than a slower, planned one.
Stage one: assess
Before moving anything, we map what exists. What runs, what talks to what, what is actually used and what is dead weight. This is the cheapest stage and the one most often skipped.
The output is a dependency map and a shortlist of risks: the systems that are easy to move, the ones that need rework, and the ones that should be replaced rather than lifted.
Stage two: stabilise
A shaky system will not survive a move. We fix the obvious fragility first — backups that have never been tested, single points of failure, undocumented credentials. Stabilising in place means the migration starts from solid ground.
Stage three: migrate
We move in waves, not all at once. The least critical services go first, each with clear success criteria and a rollback path. Your operations never lose visibility, and every wave teaches us something for the next.
Where possible we run old and new in parallel during the transition, so we can compare behaviour before committing.
Stage four: optimise
The migration is not finished when it works; it is finished when it works better. Only after everything is stable do we tune for cost and resilience — rightsizing instances, turning off what is no longer needed, and setting up monitoring that would have caught yesterday's problems.
Optimising during the move is how projects blow their budget. Optimise after.
What you should expect
- A written plan with stages, risks and rollback points. - No unplanned downtime, and none during your core hours. - A named person accountable for each wave. - A bill that goes down, not up, once optimised.
Cloud migration done well is boring. That is the goal: predictable stages, visible progress, and a business that never notices the moment it moved.
If your legacy systems are holding you back, we can start with an assessment — the lowest-risk way to find out what a migration would actually take.