Talk to us
WhatsApp us

Free cloud cost review: we will find the waste in your AWS or Azure bill in 5 business days. Book it

Application development

Legacy application modernisation

Bring an ageing but business-critical system onto a supportable footing without stopping the business to do it.

  • Phased programme
  • From USD 60,000
  • Updated

The short answer

Legacy modernisation upgrades an ageing application incrementally rather than rewriting it. LDelight uses the strangler-fig pattern: new functionality is built alongside the old system and traffic is moved feature by feature, so the business keeps running throughout.

Key takeaways

  • Strangler-fig migration — no big-bang rewrite, no freeze period
  • Every step is independently reversible
  • Security and compliance gaps closed as you go
  • Running costs usually fall before the migration completes
Legacy application modernisation

The instinct with a legacy system is to rewrite it. Rewrites of business-critical systems have a poor record, mostly because the old system encodes a decade of undocumented edge cases that nobody can enumerate up front.

Strangler-fig, not big bang

We put a routing layer in front of the existing application and move one capability at a time behind it. Each move is small, independently testable and reversible. The business never experiences a freeze, and you can stop at any point with a system that is better than when you started.

Where we start

Usually with whatever is both highest-risk and lowest-coupling: an unsupported runtime, an authentication layer with no MFA, a database version past end of life. Those give you a security and cost win early, which funds the rest of the work.

What you get out of it

  • Supported runtimes and patched dependencies
  • Deployment measured in minutes rather than scheduled evenings
  • Hosting costs reduced as legacy infrastructure is retired
  • A codebase engineers will agree to work on

Talk to an engineer about Legacy application modernisation

A 30-minute scoping call. No slide deck, no obligation — you leave with a written recommendation.

Book a consultation

What's included

  • Technical audit: architecture, dependencies, security, test coverage
  • Modernisation roadmap with sequencing and risk assessment
  • Routing/strangler layer implementation
  • Incremental capability migration
  • Automated regression test suite
  • Infrastructure modernisation and cost review
  • Decommissioning plan for the legacy estate

Related services

Let’s scope your next project

Tell us what you are building or what is not working. You will get a technical response from a senior engineer — not a sales script — usually within one business day.

Book a free consultation