Software
Replace the old system safely, audited, rebuilt in phases, migrated and cut over without stopping the business.
Software modernisation NZ businesses keep putting off comes down to one fear: breaking the system that runs everything. This page is for established businesses that need to replace old business software one person understands. You get a phased plan that swaps it out piece by piece while the business keeps trading.
the system nobody dares touch
software modernisation in phases
Legacy software replacement fails when attempted all at once. We replace the old system one module at a time, keeping old and new connected, so the business never runs on half a system.
01 of 8
First we establish what the old system actually does. We read the screens, the tables and the reports people still print, and interview the one person who knows it. You get a plain list: every function, who uses it, what depends on it.
02 of 8
Old systems hide surprises: a field called Notes that holds the delivery address, three spellings of one customer, dates stored as text. We map every old field to its new home, clean what needs cleaning and rehearse the move until the counts match.
03 of 8
The plan puts the modules in order. The one causing the most pain goes first, such as invoicing that only works on one PC, and the rest follow in a sequence that keeps old and new consistent. You see what goes live when.
04 of 8
Each module comes back as a web app in any browser, with a mobile app where staff work away from a desk. The warehouse team that used to queue for the one PC with the stock screen now updates stock from a phone.
05 of 8
While old and new run side by side, a connector keeps them in step. A customer added in the new module appears in the old invoicing system overnight, and an old-system invoice shows against them in the new one. Nobody double-enters.
06 of 8
Before the switch, the new module runs alongside the old one. Your accounts team raises the month's invoices in both, and we compare every total line by line. Differences get explained or fixed. You decide when the new system has earned your trust.
07 of 8
Cutover is a planned date, usually a quiet weekend, with the final data move done and checked before Monday. Training happens beforehand on the real screens, by role: counter staff, accounts, managers. We stay close until the first day's work is through.
08 of 8
When the last module is live, the old server is retired properly: final backup stored, licences cancelled, access removed, machine wiped. Nothing is left on the PC under the accounts manager's desk, and the old system leaves the insurer's questionnaire.
The audit gives you the list and the order. You pick the first module, usually the one causing the most pain. We rebuild it, migrate its data and run it beside the old system until the numbers match. The old system keeps doing everything else until its turn comes. The data syncs on its own. You decide when to start, when to trust it and when to switch.
We read the legacy database itself, whether Access, SQL Server, FileMaker or custom, so an Access database replacement starts from the real data. The new modules connect to your accounting software for invoicing, Microsoft 365 or Google Workspace for sign-in, and modern APIs the old system never had.
Any system with an API connects. Click a logo to visit them.
Xero
MYOB
Stripe
Google Workspace
Microsoft 365
Twilio
Shopify
HubSpotAI is optional here, and the migration works without it. Read how we use AI and where it fits in business process automation.
AI drafts a description of each screen and table for the audit, and the person who knows the system corrects it.
It flags duplicate customers, fills gaps in categories and spots addresses in the wrong field. A person approves each change.
The office runs the rebuilt modules in a browser: orders, invoicing, customer records and the reports nobody has to export any more. No install and no single PC.
Staff who never had access to the old system get what they need on a phone: a driver confirming a delivery, a technician checking stock, a manager approving an order.
Once the customer data is clean and in one place, a portal becomes possible: customers check an order or download an invoice themselves. All three run on the one new database.
Established businesses of any kind, often:
Job costing and stock control that has run the factory for decades.
DistributionOrder entry and pricing tied to the warehouse PC.
PropertyTenancy and maintenance records in an ageing Access database.
Finance and insurancePolicy or loan books that fail every security review.
Healthcare adminClient records on a server nobody supports any more.
CouncilsConsents, assets and bookings the vendor stopped supporting.
Quickest start
Where an existing Superstack module covers what the old system does, we customise it and migrate your data in.
Most common
The usual way to modernise internal software: modules rebuilt in phases and joined into one platform, with the interim layer keeping the old system in step.
Fully bespoke
For a system so specific that nothing resembles it, a fully bespoke rebuild, still delivered module by module with parallel runs.
Yes. That is the whole approach. The old system stays live and does everything it does today until each module has been rebuilt, migrated, run in parallel and signed off. The interim integration layer keeps the two in step, so staff never enter the same record twice while both are running.
By rehearsing it. We map every field, migrate into a test copy, and compare counts and totals against the old system until they match. Your team checks real records, the awkward customer, the oldest job. Only then do we run the final move, with the old data kept as a fallback.
It depends on how many modules the old system holds and how messy the data is, which the audit tells you. Because we replace one module at a time, the first improvement arrives early, and nobody waits on a big launch. The plan gives a date for each module, and you set the pace.
No patch fixes an unsupported server, a missing developer or a database nothing can connect to. When those are the problems, rebuild. When the system is stable and one function is broken, patch it and plan the replacement. Rebuild legacy system modules one at a time and the risk stays small.
It is retired, not just unplugged. Some businesses keep it read-only after cutover so old records can be checked, then we take a final backup, cancel licences, remove access and wipe the machine. You choose when. If your auditor or insurer needs confirmation the old data is gone, you get it in writing.
Continuing as you are has a cost too, just spread out: the hours spent exporting and retyping, the work you cannot take on because nothing integrates, and the risk of a failure with nobody to call. We put those beside the phased plan, module by module, so you compare like with like.
Built around the way you work.
Your business shouldn't have to fit someone else's software. Tell us how your business works. We'll show you what Superstack can build around it.
Tell us what the old system does and who still understands it. We'll come back with a phased plan.
We use cookies to see which pages help people. Nothing runs until you say yes. Read the privacy policy.