APIs & Integrations Fixed scope

Legacy SOAP to REST Gateway

A modern REST layer over an ageing SOAP or mainframe system, so new products no longer inherit decades-old limitations.

Timeline: 20 working days
Price: ₹34,999 incl. GST
Reference: NP-API-105
Ownership: Delivered into accounts you own

Overview

What this engagement is

Some systems simply cannot be replaced this year, or even this decade. Core banking platforms, insurance systems and government interfaces still communicate through SOAP, fixed-width files or older formats still. We place a REST gateway in front of them that translates protocols, normalises obscure field names and adds the caching and circuit breakers that prevent a slow backend from dragging your website down. Your new applications work with a clean, documented API, and when the legacy system is eventually retired, only the gateway needs to change.

Deliverables

What you receive

7 items

REST gateway service translating to SOAP, XML or fixed-width backends
Up to 25 operations exposed with an OpenAPI specification
Response caching with configurable freshness for each operation
Circuit breaker and timeout handling to contain backend slowness
Request and response logging with sensitive fields redacted
Translation of cryptic backend error codes into meaningful messages
Load test results showing behaviour under your expected traffic

Outcomes

What changes once it ships

New projects no longer pay the legacy integration cost every time

A slow or failing backend degrades gracefully instead of cascading

A clean boundary ready for the day the old system is replaced

Process

How the 4 stages run

Analyse

The legacy interface is documented, including its undocumented behaviour
Design

REST resources are mapped to backend operations and error cases catalogued
Build

The gateway is implemented with caching, retries and observability
Prove

Load tested and run in parallel before your applications switch over

A strong fit for

Organisations building modern front ends over a system they cannot replace
Teams rewriting the same integration code on every new project
Products where legacy latency is harming the customer experience

What we need from you

Access to the legacy system, or a test environment that behaves like it
Any documentation that exists, however dated
Someone who remembers its quirks, even if no longer working on it daily

You share these through the brief that opens in your client dashboard once payment is confirmed. The timeline starts when they arrive.

Answers

Questions about this engagement

That is common. We work from traffic capture and behavioural testing, and the resulting documentation forms part of your deliverables.

It adds a few milliseconds and usually saves far more through caching. The load test shows you the actual figures.

Yes. It runs as a container anywhere, including on-premises alongside the legacy system.

This is a digital service — nothing is shipped. Work is delivered to the timeline above, into systems you control, and our refund terms explain what happens if a date is missed.

Often paired with

Engagements that work well alongside.

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