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Legacy Application Modernization · Since 2012

Modernize Your
legacy Software without disrupting your business

Transform aging applications into secure, scalable, mordern platforms without putting your critical operations at risk.

Modernize what you already have

Trusted by 290+ clients across 12 countries

Strategy

Modernization strategies engineered for continuous delivery.

A complete system evolution shouldn’t stall your product roadmap. We replace high-risk ‘Big Bang’ deployment models with continuous, production-ready value — using the strangler-fig pattern while your business stays fully operational.

CORE RISK ELEMENT

The Big-Bang Cutover

The ZonSource Phased Path

Product Velocity

× Freeze the feature roadmap for 12+ months

✓ Continuous deployment alongside live features

Downtime Window

× A single high-stakes weekend launch window

✓ Zero operational impact via parallel routing

Data Integrity

× Bulk transactional-state migrations under pressure

✓ Record-by-record continuous pipeline sync

Legacy Dependencies

× Heavy reliance on historic, unmapped code

✓ Business rules discovered & documented as we go

Testing & Handoff

× Regression testing crammed into the final launch

✓ 100% code & IP ownership via continuous integration

What We Modernize

Legacy Modernization, end to end.

Application Re-Architecture

Break the monolith into maintainable services or a modular architecture your team can actually evolve.

Monolith → services · Modular refactor · API-first design

Cloud Migration

Move on-prem or legacy-hosted apps to AWS, Azure or GCP — rehost, replatform or refactor based on ROI.

Lift-and-shift · Replatform · Containerization · Kubernetes

Tech Stack Upgrade

Retire end-of-life frameworks — from legacy .NET, Java, PHP or AngularJS to modern, supported versions.

Framework upgrades · Language migration · Dependencies

Database Modernization

Migrate aging databases to modern engines with zero data loss and validated integrity at every step.

Schema migration · Oracle → Postgres · Data validation

UI / UX Re-Engineering

Replace dated, unusable interfaces with responsive, modern front-ends — without touching what works underneath.

React/Next.js · Responsive redesign · Accessibility

API & Integration Layer

Wrap legacy systems in clean APIs so new products and partners can integrate without touching the core.

REST/GraphQL · Middleware · Legacy wrappers · EDI

Systems modernized

0 +

Data-loss incidents

Avg. maintenance cost cut

- 0 %

Downtime cutover, standard

How It Works

A low-risk path off the legacy stack.

No big-bang cutover. We migrate incrementally so the business keeps running and you see progress every sprint.

01 Audit & Assessment

We map the legacy system — code, data, dependencies and risk — and deliver a prioritized modernization roadmap.

Modernization roadmap + risk map

02 Architecture & Plan

Target architecture, migration strategy (rehost/replatform/refactor) and a phased plan with a fixed scope.

Target architecture + phased plan

03 Incremental Migration

Strangler-fig migration in sprints — new alongside old, with parallel-run validation and rollback at every step.

Working software every sprint

04 Cutover & Handoff

Zero-downtime switch, data-integrity verification, documentation, and full code ownership handed to your team.

Live modern system + ownership

Migration Paths

From end-of-life to supported & modern.

We’ve retired the frameworks keeping your team up at night — and know the safe migration path off each one.

From (Legacy)

To (Modern)

Cloud & Devops

DATA

Case Study

How a logistics platform escaped
a 15-year-old monolith.

Challenge

A 15-year-old .NET WebForms monolith on end-of-life servers — fragile, unsupported, and blocking every new feature.

What we Did

Strangler-fig migration to .NET 8 microservices on Azure, Oracle → PostgreSQL, with a React front-end — zero downtime, zero data loss.

0

downtime at cutover

-64%

infra + maintenance cost

18 mo

of tech debt retired

16wks

to first modern release

“They moved us off a system we were terrified to touch — with no downtime and no drama. Our maintenance bill dropped by two-thirds.”

CTO, National Logistics Platform

Our Guarantees

Two commitments we put in the contract.

Zero Downtime, Zero Data Loss

Every migration runs parallel to production with validated data integrity and a rollback plan at every step. The switch happens only when it is proven safe — the business never stops.

Written into the contract

100% Code Ownership from Day 1

The modernized code is yours from the first commit — source, infrastructure and documentation. Cloud-agnostic, no proprietary lock-in. Your team can take it forward anytime.

Full IP transfer

Modernization questions, answered.

Will there be operational downtime during migration steps?

Absolutely not. By utilizing synchronized parallel environments and automated traffic splitting, we run old and new states concurrently. The modern system goes completely live only after verified production telemetry confirms it behaves as expected.

How do you guarantee that no operational data is lost?

We write custom data validation scripts that match schemas record-by-record across platforms. During migrations, data pipelines record states simultaneously to both database systems until data processing matches 100% over clear evaluation blocks.

What legacy software technologies do you actively support?

Our engineering core specializes in enterprise applications running older framework environments. This spans legacy .NET Framework configurations, WebForms, Java 6–8 micro-setups, early PHP, AngularJS code arrangements, legacy Oracle, SQL databases, and legacy mainframe COBOL elements.

How much does legacy modernization cost?

It depends on the size and risk of the system — a focused re-platform can start around $40,000, while a full monolith-to-microservices migration runs higher. We give a fixed-scope estimate after a free audit.

How long does modernization take?

A focused module or cloud migration can ship in 8–12 weeks. A full re-architecture is phased over several months, but you see working, modernized components every sprint — not just at the end.

Get Started · ISO 27001 since 2012

Still running on software you're scared to touch?

Book a free modernization assessment. A senior architect — not a salesperson — reviews your system and replies within one business day.

Book a call

30 min · Free consultation

Email

hello@zonsource.com

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ZonSource IT Solutions Pvt. Ltd. ®

Innovative solutions for a digital world.

Modernize Your legacy Software without disrupting your business