INDEXIZ

Software Engineering

Legacy System Modernization Without the Big-Bang Risk

We modernise ageing PHP, .NET and desktop applications step by step: assessment, incremental migration to modern stacks and cloud, careful data migration and a cutover your users barely notice.

MJSWDTAK35+ legacy systems modernised by Indexiz
Modernisation trackmodule 7 of 12
AssessCode · Data · RisksStrangleModule by moduleMigrateData · CloudCutoverZero downtime
✓Module migratedInvoicing · .NET 4 to .NET 8
0 hrsdowntime at cutover
35+Systems modernised
45%Average hosting cost reduction
0Big-bang cutovers
100%Data reconciled before switch
What we modernise

Legacy Modernization Services

Whether your system is a PHP 5 web app, a .NET WinForms desktop tool or a database full of stored procedures, we have a path to a modern, supportable platform.

Legacy Assessment

A fixed-scope review of code, architecture, data, security and running costs that ends in a scored modernisation roadmap with options and estimates.

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Application Re-Engineering

Rebuilding PHP, .NET, Java or desktop applications on modern frameworks while preserving business rules your team relies on.

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Cloud Migration

Moving on-premise servers and virtual machines to AWS, Azure or Google Cloud with containers, managed databases and infrastructure as code.

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Data Migration

Schema redesign, cleansing, transformation and reconciled migration of years of records with full rollback plans.

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API Layer & Integration

Wrapping legacy systems in modern APIs so new front ends, mobile apps and partners can use them while the core is replaced.

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UI & UX Modernisation

Replacing dated interfaces with responsive, accessible web front ends designed around how your staff actually work.

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Real use cases

Modernisation Projects We've Completed

Logistics

Desktop freight system to a cloud web platform

A 15-year-old VB.NET application rebuilt as a .NET 8 web platform on Azure, migrated module by module over nine months.

45%lower infrastructure cost
Healthcare

PHP 5 patient records app to Laravel

Rebuilt on Laravel and PostgreSQL with role-based access and audit logging, 1.2 million records migrated and reconciled.

Finance

Mainframe reporting replaced with a modern data platform

Batch reports moved to a cloud data warehouse with dashboards, cutting month-end close dramatically.

3 daysfaster month-end close
Why Indexiz

Why Indexiz for Legacy Modernisation

Most modernisation projects fail because they try to replace everything at once. We de-risk the work by shipping in slices that run alongside the old system until each one is proven.

Incremental by Design

The strangler pattern lets us migrate one capability at a time with the old system still live, so there is never a single risky switch.

Business Rules Preserved

We reverse-engineer and document the hidden logic in old code and data before rewriting, then prove parity with automated tests.

Reconciled Data

Every migrated table is reconciled record by record, and rollback plans are rehearsed before any cutover.

Your Team Kept Informed

Weekly demos, a shared risk register and training mean your staff and IT team are ready when each module goes live.

Our approach

Modernise in Slices, Not Leaps.

Assessment first, then a sequence of small migrations that each deliver value and reduce risk, ending in a cutover that is a non-event for your users.

Our process

A Simple Path to Success

A proven process to turn your ideas into powerful digital solutions.

01

Assess

We analyse code, data, dependencies, security and costs and score each module for value and risk.

02

Roadmap

We sequence the migration, choose the target stack and cloud, and define parity tests and rollback plans.

03

Migrate Incrementally

We rebuild and migrate module by module, running old and new side by side until each is proven.

04

Cut Over & Retire

We switch users, retire the old system and keep the new platform supported and improving.

FAQ

Frequently Asked Questions

Answers to the questions we hear most often. Need more detail? Talk to our team.

The assessment answers this per module. Code that is well structured can often be refactored and upgraded in place; tangled or unsupported code is usually cheaper to rebuild. Most projects end up as a mix, sequenced by business value and risk.

No. We use the strangler pattern so the legacy system keeps running while new modules take over one by one. Final cutovers are scheduled, rehearsed and typically completed without downtime.

We migrate data in rehearsals before the real cutover, reconcile record counts, totals and samples against the source, and keep the legacy database read-only as a fallback for an agreed period.

Yes. We routinely take over undocumented systems. We reverse-engineer the behaviour from code, database and user interviews, document it and lock it in with automated tests before changing anything.

A focused assessment takes two to four weeks. Modernising a typical mid-size business application takes six to twelve months in phases, with the first modules live within the first quarter.

Ready to leave the legacy behind?

Modernise Your System Without Disrupting the Business

Book a modernisation assessment and receive a scored roadmap, target architecture and phased estimate.

Or schedule a free consultation

Serving organizations across the world.

PakistanHQ · Lahore
Saudi ArabiaRegion
UAERegion
United KingdomRegion
United StatesRegion