Services · Legacy modernization

Old systems, made safe to change.

Legacy is not an age - it is a state: software everyone depends on and no one dares touch. Modernization is the discipline of making it safe to change again, without a big-bang rewrite that bets the business on a launch day.

The method: strangler, not sledgehammer

Audit first. Architecture, security posture, cost, release process, and the undocumented behaviours the business secretly depends on. You get a written map before any plan.
Stabilise. Monitoring, backups verified by restore, a reproducible deploy - the safety rails that make every later step boring.
Characterise. Tests around current behaviour - including the weird parts - so change becomes detectable instead of frightening.
Replace in slices. New capabilities route to new services behind the existing front door; old code retires one seam at a time. Users notice improvement, never migration.
Retire deliberately. Old components die on dates, after their replacements survive real load - never by rotting quietly.

Why rewrites fail and this does not

The full rewrite fails for a documented reason: the old system keeps changing while the new one chases it, and day one of the new system meets years of accumulated edge cases at once. Incremental replacement keeps one system live at all times, each slice individually reversible - the same rollback discipline we apply to everything.

Common questions

Our system has no documentation. Is that fatal?

It is normal. The audit produces the documentation, and characterisation tests capture behaviour even where intent was lost.

Can you modernize without downtime?

That is the entire design: slices behind the existing front door, parallel running, rollback-guarded cutovers - the migration checklist applies.

What if only part of it needs replacing?

Then only part gets replaced. The audit ranks components by risk and value; boring code that works is left in honoured peace.

Which system does everyone fear?

Name it. The audit conversation is free and requires no commitment to us afterwards.

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