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LEGACY & BUSINESS SYSTEMS MODERNIZATION

Evolve a business system
without losing what the business already knows.

A system that has been operating for years contains far more than code: it holds rules, data, exceptions, integrations and decisions that support the business. Before changing the technology, we recover that context and decide what should be preserved, what must change and how to manage the transition.

Let’s talk about your system Explore the modernization assessment
SYSTEM / TRANSITIONNO AUTOMATIC REWRITE
CURRENT SYSTEMBusiness-critical software
Business rulesDataIntegrationsOperations
POSSIBLE PATHS
RETAINREFACTORREPLATFORMREPLACEREBUILD PARTS

WHEN IT MAKES SENSE

The system still delivers value, but the approach to evolving it needs to change.

Modernization is often useful when the software remains important, but the distance between what the business needs and what the system allows begins to grow.

01 / CHANGEEvery change affects more of the system than expected.

Implicit dependencies, coupling and hard-to-predict behavior mean a local change is no longer truly local.

02 / KNOWLEDGEPart of the knowledge exists only within the system.

The real rules live across code, database, daily operation, partial documentation and experience of key people.

03 / DEPENDENCIESData and integrations make a big-bang replacement risky.

The system is part of a wider network and needs a transition that maintains contracts, references and operational continuity.

04 / EVOLUTIONThe platform is already constraining the roadmap.

Deployment, security, performance, user experience or technology support limit decisions that the business should be able to make for other reasons.

RECOVER / BEFORE CHANGE

Before we change technology, we recover context.

We do not assume that anyone holds a complete model of the system. We cross-check technical and business sources until we understand which behavior matters and where the real dependencies lie.

The goal is not to document everything. It is to gather enough evidence for modernization decisions to be based on more than intuition.

APPLICATIONActual behavior

Screens, flows, permissions, exceptions and operational scenarios that users already treat as normal.

DATAModel and historical memory

Structures, relationships, identifiers, quality and meaning of the accumulated data.

INTEGRATIONSExternal dependencies

Systems, files, APIs, manual processes and contracts that shape the transition.

PEOPLE / EVIDENCEDistributed knowledge

Users, stakeholders, documentation, code, databases and tests as sources to be cross-checked against one another.

DECIDE / NOT REWRITE

There is no single modernization path.

A complete rewrite may be the right choice, but only after comparing it with narrower-scope or lower-risk alternatives. We choose the strategy according to the value that must be preserved and the constraint we actually need to resolve.

01RETAINMaintain and stabilizeNot everything old needs to be replaced.

When part of a system still performs its role well, retaining it, documenting it and reducing its coupling may be more responsible than replacing it solely because of its age.

INTENDED RESULTLess unnecessary change · preserved knowledge
02REFACTORRefactorChange the structure without changing the value the system already delivers.

If the rules and model remain valid but the technical structure makes change difficult, we refactor within clear boundaries to restore maintainability and the ability to change.

INTENDED RESULTMore sustainable structure · same defensible behavior
03REPLATFORMReplatformMove the technology base without unnecessarily redesigning the whole product.

When the main constraint lies in the runtime, infrastructure, deployment or technology support, a platform transition can restore capacity without turning the project into a complete rebuild.

INTENDED RESULTNew operational foundation · contained scope
04REPLACEReplace specific partsReplace a component where its boundary is clear enough.

A module, integration or subsystem can be replaced independently if its responsibilities and contracts are sufficiently understood. The objective is to reduce risk by separating decisions.

INTENDED RESULTBounded replacement · phased along clear boundaries
05REBUILDRebuild where it is justifiedReconstruction is an option, not the starting point.

When the existing structure prevents safe evolution, or preserving its behavior costs more than redefining it, we can rebuild bounded parts while making explicit which knowledge must survive the transition.

INTENDED RESULTNew implementation · knowledge recovered before change

FROM SYSTEM TO TRANSITION

A transition is designed—not improvised.

Modernization connects knowledge, architecture, data, delivery and operation. Each phase must reduce a different uncertainty and leave sufficient evidence to continue without losing traceability.

  1. 01RECOVERRecover ContextRules · data · dependencies
  2. 02DECIDEChoose StrategyRetain · change · replace
  3. 03TRANSITIONDesign transitionArchitecture · migration · phases
  4. 04VERIFYVerifyBehavior · data · integration
  5. 05EVOLVEContinue to evolveProduction · feedback · continuity

SCOPE / CROSS-CUTTING

Modernizing affects more than the interface.

Scope is shaped by what limits the system, not by a fixed technology list. Some initiatives affect a single layer; others need several layers to move together for the change to remain sustainable.

01 / APPLICATION
Application and architecture

Separation of responsibilities, frontend, backend, APIs and boundaries between modules.

02 / DATA
Data and migration

Models, quality, traceability, transformation, reconciliation and cutover strategy.

03 / INTEGRATIONS
Integrations

Contracts, external dependencies, synchronization and compatibility during transition.

04 / PROCESS
UX and processes

Do not copy historical limitations when the process can be simplified or made more visible.

05 / DELIVERY
Delivery and operation

CI/CD, environments, deployment, observability and recovery capability.

06 / QUALITY
Quality and risk

Testing, security, performance and evidence proportionate to the impact of the change.

CLIENT WORK / OPERATIONAL

Condis Supermercats
BUSINESS SYSTEMS MODERNIZATION · OPERATIONAL APPLICATION

Study first. Build afterwards.

The work for Condis began with a technical assessment before development. We cross-checked the legacy application, database and business knowledge to define the transition and build a new application for managing incidents and investment proposals, now operational.

STUDY

The initial assessment recovered rules, dependencies, data and user needs before the scope and transition were defined.

APPLICATION

The software developed is an application for managing incidents and investment proposals.

MIGRATION

Data migration designed as a repeatable and traceable process, not a single-run script.

DELIVERY

Modernization also includes how the system is deployed and developed through a more controlled delivery process.

The application is operational. We describe the verified scope and mechanisms without attributing adoption, performance or return metrics that have not been specifically measured.

View the Condis case study

LEGACY MODERNIZATION ASSESSMENT

When the path is not yet clear, the first deliverable is a decision.

Before committing a significant modernization, an assessment can recover the context enough to compare strategies, make explicit risks and build a defensible roadmap.

The assessment belongs to the client. You can use it to run the modernization with Rabassoft, your internal team or another provider.

Explore the modernization assessment
OUTPUT / DECISION ASSETCLIENT OWNED
01 / SYSTEM MAPSystem and relevant knowledge map
02 / EVIDENCEData, dependencies, constraints and identified risks
03 / OPTIONSModernization options with explicit trade-offs
04 / ROADMAPRecommendation, phases and transition strategy

START / CONVERSATION

If your system remains important, let us begin by understanding what deserves to be preserved and what must evolve.

The first conversation helps us understand the context and assess fit. You do not need to arrive with a predefined modernization strategy.

Let’s talk about your system