Replacing everything at once is the most expensive bet
A big-bang migration puts the whole operation at risk at the same time: if something breaks, there's no easy way back or way to isolate the failure.
Legacy modernization
We modernize legacy systems without stopping the business
We connect the current system via APIs, migrate module by module, and add AI where it makes sense, without a full replacement or downtime.
DELIVERED EXPERIENCE
+4
years of experience
+4
delivered projects
BACKING FOR YOUR PROJECT
Microsoft Partner certified in cloud technologies.
Google Developer Program members.
Trusted by leading companies
THE RISK OF NOT MODERNIZING
Patching a legacy system forever has a ceiling
The older the system, the more expensive every change gets, and the more the business depends on knowledge nobody wrote down.
System knowledge lives in a handful of people
When the only documentation is two or three people's memory, every change depends on those people staying available.
There's no clear layer to connect new systems
Without APIs or an integration layer, every new system ends up coupled directly to the legacy database, making every future change more fragile.
Every department asks for something different with no roadmap
Without a diagnosis or priorities, modernization gets driven by whichever department pushes hardest, not by actual business risk or impact.
HOW WE DO IT
Incremental modernization, not a full replacement
The mechanism is chosen based on how critical the module is and how often it changes, not a single migration for the whole system.
Initial technical diagnosis and a prioritized roadmap
We map the current system, its dependencies and risks before touching anything, and prioritize what to modernize first by business impact, not technical ease.
An API layer between old and new
We expose the legacy system through REST APIs or events so new components can consume it without coupling directly to its database.
Temporary coexistence between legacy and new components
Scenario: an insurer migrates its policy module to a new platform while claims keeps running on the legacy system, synced through events during the transition.
Module-by-module migration, not all at once
Each module is validated in production before moving to the next, so the blast radius of any failure stays contained to that piece.
AI on top of what already exists, when it makes sense
Agents or automations that read and write against the legacy system through that same API layer, without waiting to replace it first to use AI.
Less operational risk, business continuity
The goal isn't modernizing fast, it's modernizing without interrupting billing, customer service, or critical processes while the work is underway.
WHAT WE CONNECT
Legacy inside a modern architecture
The integration mechanism depends on data volume and how fast each system needs to find out.
ERP
SAP, Tango, or other ERPs connected via REST API or batch processes when data volume justifies it.
CRM
Salesforce, HubSpot, or another CRM coexisting with the in-house system during migration, without duplicating customers.
Databases and in-house systems
Controlled exposure through a service layer, with no direct access from new systems to the legacy database.
AI and automation platforms
Data flow into agents or AI models without duplicating the business logic that already lives in the current system.
HOW WE IMPLEMENT IT
From diagnosis to production, in stages
Four stages, each with a verifiable deliverable before moving to the next.
Initial technical diagnosis
We map the current system, its integrations, dependencies, and which parts shouldn't be touched yet.
Prioritized modernization roadmap
We define the migration order by technical risk and business impact, not by which module is easiest to touch.
Integration layer (APIs)
We build the layer connecting legacy to new components before migrating the first module.
Module-by-module migration
Each delivery is a module running in production, validated, with the ability to roll back if something doesn't hold up.
FREQUENTLY ASKED QUESTIONS
Legacy system modernization before you startbefore you start
Clear answers to the most common questions about our services and process.
I want to talk to you
We reply in under 24 hours
Team and delivery
What makes working with Granweb different
Speed with sound judgment
We agree on scope before starting and deliver in stages.
Support at every stage
The same team from the first idea to well after launch.
A committed team
A team in charge of the project
We support every stage with a team that understands the company's goals, proposes solutions, and sees them through.
No. 4 in LatAm
Buenos Aires ranks among the region's largest technology talent markets, according to CBRE 2025.
#26
Argentina's global position in the EF English Proficiency Index.
Advantages for regional and international projects
- Compatible time zones: live meetings with Latin America and the United States, without waiting a day to unblock an issue.
- Direct communication in Spanish and English, with clear technical documentation for international teams.
- Direct access to the people who design and build, with no intermediaries or subcontracting chains.
RFPs and enterprise projects
Do you have an RFP or tender document to modernize legacy systems?
We assess the requirements from the documentation available, even if technical decisions are still open.
If the material is confidential, an NDA is agreed before receiving it. Documentation: contacto@granweb.io
Legacy Modernization
Let's start with the diagnosis
Tell us which system needs to evolve and which part of the operation can't afford to fail.
Methodology aligned with ISO 9001:2015
At Granweb we work to high quality standards: planning, validation, documentation, and continuous improvement on every project.
