Service 05
Modernise the system your business still depends on
Somewhere in most established companies there is an application that still runs the business and that nobody wants to open. It works on one machine, it was written by someone who left, and every year it becomes slightly more dangerous. Modernisation is how you get out of that position without stopping the business.
- The problem
- A critical system runs on old technology, one server and no documentation — and replacing it feels riskier than living with it.
- What we do
- We document what it actually does, rebuild it in stages on modern architecture, and run old and new together until the switch is safe.
- Business value
- A system your team can change again, running on infrastructure that is supported, with the operational knowledge written down.
Understanding legacy system modernization
Legacy modernisation is not a rewrite for its own sake. It is a response to specific, measurable risk: the technology is out of support, only one person understands it, it cannot be accessed remotely or from mobile, it cannot integrate with anything, or every small change takes weeks and breaks something else.
The most common failure in these projects is the big-bang replacement — eighteen months of building, one weekend of cutover, and a business that discovers on Monday which undocumented behaviours mattered. We work incrementally instead: understand, carve off, replace, verify, repeat.
An honest assessment sometimes concludes that the right answer is not to replace the system at all. Wrapping it in an API, moving it to supported infrastructure, or automating around it can buy years of stability for a fraction of the cost. We will say so when that is the case.
Signals this applies to you
- Businesses running critical software on unsupported technology
- Companies where one person is the only one who understands a key system
- Teams that cannot work remotely because the system is tied to an office PC
- Organisations blocked from integrating or automating by an inflexible legacy application
What Silver Shark can build
Concrete deliverables rather than categories. Most projects combine several of these.
Desktop application to web platform
Systems tied to one PC or a local network rebuilt as web applications that work from any location, on any device, with proper user accounts.
Excel workflow to internal system
The critical shared workbook — with its formulas, macros and version conflicts — replaced by a multi-user system with validation and history.
Ageing PHP or .NET applications
Older codebases moved onto supported frameworks and modern architecture, keeping the behaviour the business relies on.
Database process to API
Direct database access by multiple applications replaced with a controlled API, so business rules live in one place.
Strangler-pattern replacement
New functionality served by the new system while the old one continues, module by module, until the legacy system has nothing left to do.
Data migration & cleaning
Years of accumulated records mapped, de-duplicated, validated and moved, with a dry run and a reconciliation report before cutover.
Infrastructure modernisation
Unsupported operating systems and single-server deployments moved to maintained environments with backups that are actually tested.
Documentation recovery
Where knowledge was never written down, we reconstruct the data model, business rules and operational procedures from the system itself.
How the work runs
Specific to this service — the general delivery sequence is on every project.
- 01
Assess before proposing
We review the code, the database and the actual usage, and produce a written assessment of risk, effort and options — including the option of not rebuilding.
- 02
Recover the rules
Undocumented behaviour is the real asset in a legacy system. We extract it from the code and from the people who use it daily, and document it as part of the work.
- 03
Replace in slices
A module at a time, with both systems live and integrated. Each slice is small enough to reverse if something is wrong.
- 04
Prove the data before cutover
Migration is rehearsed on a copy, and reconciled record by record against the source, before anyone is asked to trust it.
The sequence every project follows
- 01
Discover
Understand the operation before discussing technology.
- 02
Analyse
Decide what should be removed, automated or built.
- 03
Design
Design the data model and the screens people will live in.
- 04
Build
Build the core in usable stages.
- 05
Integrate
Connect the system to everything else that holds the truth.
- 06
Test
Test with your data and your awkward cases.
- 07
Launch
Go live in a controlled, reversible way.
- 08
Support
Keep it working and keep it improving.
Legacy System Modernization — common questions
Can we modernise without downtime?
In most cases yes. Running the new system in parallel and migrating module by module means the business keeps operating throughout, with only a short window for the final data switch.
What if nobody knows how the old system works?
That is common and it is workable. The code and the database describe the behaviour precisely, and the people using it daily know the exceptions. Together those two sources are enough to reconstruct the rules.
Should we rebuild or buy a product instead?
It depends on whether the process is standard. Accounting, payroll and HR are usually better bought. The operational process that makes your business different is usually better built. We assess it honestly rather than defaulting to a rebuild.
Will we lose historical data?
No. Historical data is migrated, and where it cannot be cleanly mapped it is preserved in an accessible archive rather than discarded.
How do we justify the cost when the old system still works?
The case is usually risk plus opportunity: what a failure would cost, what it costs to have one irreplaceable person, and what you currently cannot do — integrate, automate, work remotely — because the system will not allow it.
Next step
Tell us where legacy system modernization would help.
Describe the process as it runs today — including the parts that are held together by people. We will tell you what is worth building, what is worth automating, and what is worth leaving alone.