Legacy System Modernisation

When Do You Need Legacy System Modernisation?

Legacy systems create security vulnerabilities, drain budgets with high maintenance costs, and make integration nearly impossible. This service is perfect for organisations relying on outdated or monolithic applications that need to perform efficiently.
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Ruslan Grumbianin
Chief Project Officer

Legacy System Modernisation Benefits

Reduced technical debt

Refactored legacy code and improved architecture that results in higher code quality and easier long-term maintenance.

Improved performance & scalability

Optimised performance, faster response times, and cloud-ready architecture delivered through legacy software modernisation services that scale with demand.

Stronger security & compliance

Enhanced data protection, improved compliance readiness, and secure cloud or mainframe modernisation to reduce operational and regulatory risk.

Better customer experience

Improved usability and accessibility across modern digital interfaces enabled by legacy application modernisation.

Business agility & AI readiness

Adoption of modern technologies that support AI integration and business-critical systems.

 Our Legacy System Modernisation Approach Across the 6Rs

Rationalise

We assess legacy systems as part of our legacy software modernisation services, define a clear roadmap, and decide what to replace, rebuild, or retire.

Refactor

We improve existing code through legacy application modernisation to reduce technical debt while maintaining stability.
Product-Information-Management

Replatform

We move applications to modern or cloud platforms, including mainframe modernisation, with minimal disruption.

Rearchitect

We redesign systems using API-first and event-driven architectures to support long-term modernisation.

Re-engineer

We modernise business-critical systems while preserving data integrity and operational continuity.

Reimagine

We refresh user experience with accessible, user-centred UX UI modernisation.

Our Legacy System Modernisation Process

01

Discovery & proof of concept

We validate the approach early through a focused proof of concept to reduce risk in legacy application modernisation.
02

Risk assessment & mitigation

We identify technical and business risks upfront and define controls to support safe legacy software modernisation services.
03

 Phased migration

We migrate systems in stages to minimise disruption, including complex mainframe modernisation efforts.

04

Testing & validation

We test functionality, performance, and security to ensure stability throughout the modernisation process.

05

Legacy software migration

When you need your technology to move in sync with your business goals.We complete the migration to modern platforms while preserving data integrity and business continuity.

Legacy System Modernisation Deliverables

Modernisation roadmap

A structured roadmap based on legacy system assessment and technical analysis. We define scope, risks and priorities to guide successful legacy application modernisation.

Modernised applications

Refactored or rebuilt applications using modern frameworks. We reduce technical debt, improve performance, and strengthen long-term maintainability.

Cloud & infrastructure setup

Secure cloud migration and infrastructure configuration aligned with your target architecture, enabling scalability and resilience.

Modern DevOps pipeline

CI/CD automation, integrated testing and streamlined release processes to accelerate delivery and improve reliability.

Documentation & knowledge transfer

Clear support documentation, runbooks, playbooks and system architecture diagrams to ensure smooth handover and internal capability building.

API & integration layer

REST APIs are designed with an API-first approach and supported by secure API gateways to enable seamless system integration.

Industry-Specific Software Engineering

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Banking & finance

Core system migration
High-availability API gateways
SEPA & SWIFT payment systems
Secure digital channels

Government & public

High-load web portals
EAA compliance
Public data platforms

Logistics

Fleet management systems
Route optimisation
Secure order management
Billing platforms

Telecoms

B2B web portals
CRM & ERP integrations
Data warehouse solutions
eCommerce apps
Self-service apps

Insurance

Secure mobile applications
Customer web portals
DORA-compliant systems

Why Baltic Amadeus

Security & compliance.

No vendor lock-in.

SDLC, supported by experts.

Top Clutch IT Services Company Lithuania 2025

Certifications

Certification mark for TÜV Thüringen with a red checkmark and a red mask symbol.
ISO 27001
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ISO 9001
The Open Group TOGAF 10 OGEA-103 certification badge with a blue circular border.
TOGAF
Badge with text 'Offensive Security OSCP' inside a circular design with orange and black accents.
OSCP
View all certificates

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FAQ

What are the main approaches to modernising legacy systems?

Common approaches include rehosting, refactoring, replatforming, and full re-architecture. Legacy software modernisation services may also involve partial replacement or integration with modern platforms. The right approach depends on business goals, technical constraints, and the need for future scalability or cloud adoption.

How much does legacy system modernisation cost?

The cost of legacy application modernisation varies based on system size, architecture, integrations, and security or compliance requirements. Mainframe modernisation typically requires a higher investment due to complexity, but it often delivers long-term cost savings through improved performance, reduced maintenance, and better scalability.

How long does a legacy software modernisation project take?

The timeline for legacy software modernisation services depends on system complexity, technology stack, and business criticality. Smaller legacy application modernisation projects may take a few months, while large-scale systems or mainframe modernisation can take longer. A phased approach is often used to reduce risk and ensure business continuity.

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Let’s talk about your project

Starting something new or need support for an existing project? Reach out, and our experts will get back to you within one business day.

+370 52 780 400
[email protected]

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