LEGACY MODERNIZATION

Modernize the System.
Keep the Business Running.

When a core system slows every change but is too important to switch off, we modernize it in planned stages. Each part is kept, moved, rebuilt, or replaced on its own merits, while the business keeps working on top of it.

Discuss Your System
See How It Works

Every modernization starts with an assessment of what you have. You choose the path with the risks and the investment in writing.

What is Legacy Modernization?

Change What Is Underneath Without Stopping What Runs on Top.

A legacy system is not just an old one. It is a system the business still depends on that has become slow, risky, or expensive to change.

We modernize those systems part by part: we keep what still works, move what only needs a new home, rebuild what holds the business back, and replace what a product now does better. Old and new run side by side until each new part has proven itself.

The technology follows the system and the team that will own it: a low-code platform such as OutSystems, an established stack such as .NET or Java, cloud services, or a packaged product where one fits.

When It Is Time

Six Signs a System Has Become the Bottleneck.

Most legacy systems still work. The problem is what they cost the business in speed, risk, and attention every time something needs to change.

Slow change

Every change takes months, not weeks

Small requests wait in a queue because every change touches everything else. The business has learned to stop asking.

Knowledge risk

Only a few people understand it

The business rules live in the code and in the heads of the people who wrote it. When they leave, so does the ability to change it safely.

End of life

The platform under it is running out

Vendor support is ending, security findings pile up, and the skills to maintain it are getting harder to hire.

Integration

It cannot connect to anything new

New channels, partners, and AI initiatives all need clean access to the data and logic locked inside it. Each one becomes a workaround.

Workarounds

The real process runs around it

Spreadsheets, re-keying, and side tools fill the gaps the system cannot. The workarounds have become the process.

Investment

Running it absorbs the budget

Most of the investment goes into keeping the system alive, and very little into making it better.

Recognize more than one? That is common. The assessment shows which parts to address first and which can wait.

Get a straight answer →

Modernization Paths

Not Every System Needs a Rewrite.

A full rewrite is the most expensive and the riskiest option, and it is rarely the right one for the whole system. We choose the path for each part of it, from the least change that solves the problem to the most.

Least changeMost change

Stabilize and keep

Leave it where it is, fix the fragile parts, document it, and put proper support around it.

Fits whenIt still does the job and the business case for changing it is not there yet.

Re-host

Move it to modern infrastructure or the cloud with little or no change to the code.

Fits whenThe application is sound but the hardware or data center underneath it is the problem.

Re-platform and refactor

Move to a supported platform and restructure the code, separating parts and opening them up through APIs.

Fits whenThe logic is valuable but the structure makes every change slow and risky.

Rebuild

Rebuild the part on the technology that fits, preserving the business rules that matter and dropping the ones that no longer do.

Fits whenThe technology is at its end and the part is central to how the business works.

Replace

Move to a packaged product or SaaS, and integrate it with everything that stays.

Fits whenA product now does the job well and the process is not what makes you different.

Retire

Switch it off, archive what must be kept, and move the few remaining users elsewhere.

Fits whenHardly anyone uses it, or what it does is already done somewhere else.
In practiceMost systems end up with a mix: one path for each part, chosen in the assessment and agreed with you.

How We Modernize

Part by Part. Each Change Proven Before the Next.

The same five stages, whatever path each part of the system takes. The plan moves forward one part at a time, and every change is proven in use before the next one starts.

  1. 1

    Assess

    Inventory, dependencies, data, business rules, and risks. What the system does, and what the business actually uses.

    Mapped0%
  2. 2

    Choose the path

    A path for each part, from keeping it to replacing it, the order to address them in, and the investment.

    Plan agreed0%
  3. 3

    Modernize in stages

    One part at a time: stabilized, moved, rebuilt, or replaced, while everything else keeps running.

    DoneTo do
  4. 4

    Verify and switch over

    Each change tested in use, data reconciled, users ready, and a way back where something changes hands.

    DoneTo do
  5. 5

    Run and evolve

    A documented handover to your team, or our AMS team runs it. The system keeps improving from there.

    Done100%
Parts addressed on their chosen pathParts still to address

Keeping the Business Running

The Change Happens Underneath. Operations Carry On.

Modernization fails when the business is asked to stop for it. These are the safeguards built into every stage.

Old and new side by side

Where a part moves or is rebuilt, the current version keeps running until the new one is built, tested, and proven next to it.

A way back at every step

Every switch-over has a rollback plan, so a problem means going back one step, not a crisis.

Data that matches

Migrations are rehearsed and reconciled against the current system, record by record where it matters.

Users in from the start

The people who use the system test each part early, so the switch-over is not their first look at it.

Knowledge written down

The business rules recovered from the current system are documented, so they are not lost a second time.

Value along the way

Each stage delivers something the business can use, instead of everything arriving at the end.

AI-Assisted Modernization

AI Reads the Old Code. Engineers Decide the New Design.

Legacy systems are where AI tools help most: years of code, little documentation, and business rules nobody remembers writing. It is governed acceleration: the tools speed up the reading and the checking, and experienced engineers make every decision.

  • Understand. Map the code, its dependencies, and the business rules buried in it.

  • Document. Turn what was found into documentation your team can use.

  • Verify. Generate tests that check the new system behaves like the old one where it should.

  • Within your rules. Which tools are used, and what code and data they can see, is agreed with you.

Legacy code
IF CUST_TYPE = 'B' AND REGION IN ('N','C') AND ORD_TOTAL > 5000 THEN DISC := 0.07; END IF;
Business rule foundBusiness customers in the North and Center regions get a 7% discount on orders above 5,000.
✓ Confirmed by your team, then built and tested

In Practice

A 20-Year-Old Core System, Modernized Without Stopping the Business.

Insurance · Healthcare benefits

From Oracle Forms to a modern core

A healthcare benefits company serving hundreds of insurers ran its business on a system built over 20 years, with more than 1,000 forms and 1,000 database tables. It was slow to change and hard to scale. We modernized it in stages: a shared foundation first, then the core business modules, with business users testing each part as it was built and an internal team trained to own it.

BeforeA policy coverage update took close to two weeks to reflect in the system.
AfterCore modules rebuilt on a modern, multi-tenant platform, adapting faster to market and regulatory change.
Read the story →
20+years of legacy system
1,000+legacy forms and tables
200applications in the first year
700+screens delivered
Also from our work: Farmodiética unified its legacy applications into one multi-language, multi-tenant ecosystem: the Victus platform.

Before and After the Modernization

Part of One Line of Accountability.

Modernization sits between a clear decision and a system that keeps evolving. These are the services on either side of it.

Before · Not sure where to start?

Technology Consulting & Assessments

An independent view of your systems and architecture, and a recommendation before you commit to a path.

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You are here

Legacy Modernization

Modernize the system part by part, while the business keeps running on it.

AssessPathStagesSwitch over
During and after

Application Maintenance & Support

A named team that keeps the system stable while it is being modernized, and runs it afterwards.

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What's Next

Start With What You Have. Choose the Path With the Facts.

An assessment of the system, the data, and the risks, with a recommended path for each part and the investment it would take.

The assessment is scoped and agreed with you before it starts.

Frequently Asked Questions

Common Questions, Direct Answers

  • No. Most systems end up with a mix of paths: some parts stay and are stabilized, some move, some are rebuilt or replaced. The assessment recommends a path for each part, and you decide.

  • Each part is switched over only when it works, the data matches, and the people using it are ready, with a way back at every step. Where a part is moved or rebuilt, the current version keeps running until the new one has proven itself.

  • That is the usual starting point. We recover the business rules from the code, the data, and the people who are left, with AI tools to speed up the reading, and we document what we find.

  • Data migration is planned from the assessment. It is rehearsed, reconciled against the old system, and verified before anyone relies on the new one.

  • Low-code platforms such as OutSystems, established stacks such as .NET and Java, cloud services, or a packaged product where one fits. We recommend what fits the system and the team that will own it, and put the reasoning in writing.

  • It depends on the size of the system and the paths chosen. Because we work in stages, the business sees results from the first stage rather than waiting for the end.

  • The assessment produces the path and the investment for each part before you commit. You can proceed one stage at a time, and nothing changes in scope without your agreement.

  • Your team, or ours. Our Application Maintenance & Support team can keep the current system stable while the modernization runs, and support every part as it changes.