We need to refactor — but we cannot afford any downtime

Strangler Fig migration: new system grows next to the old one, no maintenance window.

Refactor in production safely by routing traffic piece by piece — users only notice that things got faster.

Talk to us about this See: Refactor & performance

Signs this is your problem

You will recognise yourself in at least one of these

You know the system needs to change but every plan involves a maintenance window the business cannot afford.
Past migration attempts ended in rollbacks.
Critical flows are too important to risk in a big-bang cutover.
You are stuck because of risk, not because of effort.

Why it happens

The root cause, in plain language

Big-bang migrations are uniquely risky because everything switches at once. Strangler Fig migrations build the new system alongside the old and route traffic piece by piece — risk drops by orders of magnitude.

Our approach

How we actually fix this

1
Map the critical surface area and identify safe migration units.
2
Build the new, optimised code alongside the existing system.
3
Route a small percentage of traffic to the new path and observe in production.
4
Gradually expand the new path while keeping the old as a fallback until decommission.

What you can expect