Legacy system migration plan | Bloonde Soluciones Tecnológicas

Your company depends on a system that works, but is increasingly difficult to maintain, more expensive to operate and riskier for the business. Migrating to modern technology is necessary, but doing it wrong can paralyze operations.

Our legacy migration planning service designs the complete strategy: what to migrate, in what order, with which technology and how to minimize risk during the transition.

At Bloonde we've migrated legacy systems of all kinds — from Visual Basic applications to monolithic ERPs — with zero downtime for the business.

Legacy system migration plan to modern technology

The problem it solves

Legacy systems are a paradox: they're critical to the business (everything depends on them) but increasingly dangerous (no support, no updates, no ability to evolve). The fear of migrating is understandable, but the cost of not migrating grows every year.

Most failed migrations fail due to lack of planning, not technical problems. They attempt to migrate everything at once, without an incremental strategy or contingency plan.

System without support or updates

Obsolete technologies without security patches or functional evolution. Every day that passes increases the risk.

Key person dependency

Only 1-2 people understand the system. If they leave, the knowledge is lost.

Inability to evolve

New features are impossible or prohibitively expensive to implement in the current system.

Growing maintenance costs

Maintaining a legacy system costs more every year: specific hardware, obsolete software licenses, scarce specialized personnel.

How it works

We plan the migration in 4 phases:

01

Current system analysis

We document the legacy system: functionalities, data, integrations, dependencies and business processes it supports.

02

Target architecture definition

We design the modern architecture that will replace the legacy system, choosing the right technologies for each component.

03

Incremental migration strategy

We define the phased migration plan: what gets migrated first, how both systems coexist during the transition and the validation criteria.

04

Execution and contingency plan

We detail the timeline, required resources, rollback plan for each phase and data migration strategy.

Key benefits

Migration without interruptions

The incremental strategy allows migrating without stopping the business. Both systems coexist during the transition.

Controlled risk

Each phase has validation and a rollback plan. If something fails, it's reverted without impacting operations.

Predictable costs

The plan includes cost estimates per phase. No surprises or multiplying budgets.

Modern and maintainable technology

The new system is built with current technology, with support, updates and the ability to evolve.

Documented knowledge

The migration process documents the entire system: you no longer depend on one person's memory.

Technologies and strategies

Strangler Fig pattern

Incremental migration pattern that replaces the legacy system piece by piece without disrupting the service.

Laravel + PHP

Modern framework to replace legacy backends while maintaining business logic.

Coexistence APIs

API layer that allows the new and legacy systems to operate in parallel during the transition.

Data migration ETL

Automated pipelines to migrate and transform data from the legacy schema to the new one.

Case study: logistics company with Access ERP

Scenario

A logistics company with 40 employees operated with an ERP built in Microsoft Access 15 years ago. The database was at capacity limits, there was no support and only one person understood the system.

Challenge

Migrate to a modern system without disrupting daily logistics operations, preserving 15 years of historical data.

Solution

We designed a 4-phase migration using the Strangler Fig pattern: first we migrated the query module (read-only), then daily operations, then invoicing and finally reports. Both systems coexisted for 3 months.

0 hours

Downtime

100%

Data migrated

-60%

Maintenance cost

x5

System speed

Frequently asked questions

Can I keep using the current system during migration?

Yes. Our incremental strategy allows both systems to run in parallel. You migrate in stages without interruptions.

Is data lost during migration?

No. We include complete data migration with validation. Historical data is preserved and transformed to the new schema.

How long does a migration take?

It depends on the system's complexity. Planning takes 3-4 weeks. Execution can take 3 to 12 months depending on the scope.

Do you only plan or also execute?

Both. We can deliver just the plan for your team to execute, or handle the complete implementation.

Is your legacy system holding you back?

We design the migration plan you need: no risks, no interruptions, no surprises.

Other use cases you may be interested in

Technology audit and roadmap

We assess your infrastructure, code and technology processes to identify risks, opportunities and define a prioritized roadmap.

View use case

Digital transformation for SMBs

We define your SMB digitalization roadmap: what to digitalize first, with which tools and in what order.

View use case

Want to implement this solution in your company?

Tell us about your challenge and we'll propose a tailored solution. No commitment.

Back to consulting use cases