Application Modernisation

Modernise ageing applications so they are secure, maintainable, and ready for what the business needs next.

Why it matters

The business challenge

Legacy applications keep the business running, but at growing cost: changes take months, the people who understand the code are leaving, and security and compliance exposure increases each year. Replacing everything at once is rarely realistic, so organisations need a pragmatic path — modernising what matters most, in an order the business can absorb.

You might recognise this

Small changes to core applications take weeks to deliver and carry outsized risk.
Key systems depend on unsupported technologies or a handful of individuals.
Applications cannot integrate cleanly with modern platforms and APIs.
Hosting and licence costs for ageing systems keep climbing.
Users work around old interfaces with spreadsheets and manual steps.

The solution

How PASDACS helps

PASDACS assesses the application portfolio and defines the right treatment for each system — rehost, replatform, rebuild, or replace — sequenced by business value and risk. We modernise architectures towards cloud and APIs, rebuild critical applications with current technologies, and migrate data safely, keeping the business running throughout. Documentation, testing, and handover discipline ensure the modernised estate stays maintainable.

Services included

Application portfolio assessment and modernisation roadmap
Security posture and configuration review of legacy applications
Legacy application rebuild and replatforming
Cloud migration and re-architecture
API enablement and integration modernisation
Bespoke web and mobile application development
Data migration and legacy decommissioning
Quality assurance, testing, and release management
DevOps enablement and deployment automation
Application maintenance and ongoing support

How we deliver

Delivery approach

Assess

Inventory applications, dependencies, cost, and risk, and agree the treatment for each system.

Plan

Sequence the modernisation roadmap by value and risk, with clear cutover and coexistence strategies.

Modernise

Rebuild, replatform, or migrate applications in iterations, with testing and business validation throughout.

Transition

Cut over users and data safely, decommission legacy systems, and hand over complete documentation.

Support

Maintain and enhance the modernised estate with structured support and a continuous release pipeline.

Tooling

Technology ecosystem

Major cloud platforms
Modern development frameworks
Low-code and no-code platforms
Enterprise iPaaS and integration tools
DevOps and CI/CD toolchains

Outcomes

What you can expect

Faster, lower-risk delivery of changes to modernised applications
Reduced security and compliance exposure from unsupported technology
Lower run costs through cloud hosting and decommissioned legacy systems
Applications that integrate cleanly through modern APIs
A maintainable estate with documentation and shared knowledge, not key-person risk

Related capabilities

Systems & Technology

Select, implement, build and support the enterprise systems and bespoke applications your business runs on.

Explore capability

Automation & Integration

Eliminate repetitive work and connect systems with RPA, workflow automation, APIs and enterprise integration.