DebugInit
Modernize critical systems without losing operational knowledge.
Map existing code, data, workflows and dependencies; then incrementally modernize architecture, interfaces and user experiences.
Start with evidence, economics and operational risk—not technology hype.
When this fits
Four signals. If none of them describes your situation, this is not the engagement you need — and we would rather say so now.
It works and nobody dares touch it
The system runs the business and the people who built it have left.
Change takes months
A small alteration requires a release, a specialist and a held breath.
It cannot meet current controls
Access, audit or residency requirements the original design never anticipated.
Integration is the bottleneck
Everything modern has to be bolted to it through an export.
Method
Evidence first, then economics, then a decision. Reversing that order is how expensive mistakes get made.
- 01
Read what exists
Code, data, workflows and dependencies — including the behaviour nobody documented but everyone relies on.
- 02
Capture the knowledge
The rules and exceptions encoded in the old system, written down as specification rather than lost with it.
- 03
Strangle, don't stop
Route one capability at a time to the new system while the old one keeps running.
- 04
Migrate with reconciliation
Move records, then prove old and new agree before anyone depends on the answer.
- 05
Decommission deliberately
Turn the old system off on a date, after it has been read-only long enough to trust.
Deliverables
What you hold at the end, whether or not you continue with us.
- System and data map
- What exists, what it depends on, and what would break if it stopped.
- Encoded-rules specification
- The operational knowledge inside the legacy system, recovered as documentation you keep.
- Migration plan
- Sequence, reconciliation approach, rollback points and the cutover criteria.
- Running increment
- A first capability in production on the new platform, with the old one still available.
- Decommission criteria
- What has to be true before the old system is switched off.
If the work leads you to a different vendor, it was still worth doing. That is the standard we hold it to.
Technology approach
New capability is built on the DebugInit core platform and routed to incrementally, so the legacy system loses responsibility gradually rather than all at once. Each increment is independently useful and independently reversible.
Data moves under reconciliation: both systems hold the truth until they demonstrably agree. The old system becomes read-only before it becomes decommissioned, and it is decommissioned on a date rather than by neglect.
Outcome measures
Baselined before the work starts and re-measured after. These are the measures; results belong to your engagement and are published only with evidence.
Change lead time
How long a modification takes from request to production.
Incident rate
Failures attributable to the system, before and after.
Reconciliation variance
How far old and new disagree during migration, driven to zero.
Knowledge captured
Rules documented versus rules still only in the old code.
Operating cost
Licences, hosting and specialist support.
Control coverage
Which required controls the system can now actually evidence.
What we will not do
Where our incentive and your interest diverge, written down before you have to work it out.
- Rewrite it in one go
- Big-bang rewrites of systems nobody fully understands are how businesses lose a quarter.
- Start before the knowledge is captured
- The most valuable thing in a legacy system is the rules it encodes. Losing them is the real risk, not the code.
- Promise a date before the dependency map
- Legacy estimates made before reading the dependencies are fiction.
- Replace it if the economics say keep it
- Sometimes the right answer is to wrap it, control it and leave it running.
If an assessment concludes the honest recommendation is to change nothing, that is a valid result and we will say it.
Start with an assessment
Fixed scope, defined deliverables, and findings you own regardless of what you decide to do next.