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Connecting a New Front End to a Legacy System
9 Oct 20262 min read
A project-type walkthrough of integration work: adapters, sync, idempotency and shipping a modern interface without replacing the core.
Connecting a New Front End to a Legacy System
This is a description of a project type we deliver: a new interface for users, built in front of a core system that cannot be replaced.
The Challenge
The system that holds the data still works and still encodes years of business rules, but its interface no longer serves the people using it. A full replacement was too risky and too slow; leaving things as they were was costing time every day. The requirement was a modern experience without disturbing the engine.
Our Approach
Discovery documented how the legacy system actually behaves: which endpoints or files it exposes, how it identifies records, what it does under concurrent access, and which of its quirks are load-bearing. Integration points were catalogued with their failure modes before a line of the new interface was written.
Solution
An adapter layer that speaks to the legacy system in its own language and exposes a clean API to the new front end. The interface is server-rendered and responsive, with optimistic behaviour only where the underlying system can guarantee it. Where the legacy system cannot support a needed operation, a synchronisation job reconciles instead of blocking.
Technology
Chosen to match what the organisation can operate: a service layer in a mainstream language, a cache where it removes pressure from the core, and structured logging across the boundary so a failure can be traced end to end.
Implementation
Released screen by screen, with the old interface kept in parallel until each area had proven itself in daily use, and with reconciliation checks running throughout.
Results
Task completion and error rates are measured against the previous interface, and published only where verified and approved.
Stuck with a system you cannot replace? Tell us about your project and we will map the boundary first.
Project details in this article are deliberately general. Client names, verified results and references are published only with the client's approval.