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APIs & Integrations Fixed scope

Legacy SOAP to REST Gateway

A modern REST facade over an old SOAP or mainframe system, so new products stop inheriting decades-old constraints.

Delivered in

20 working days

Revisions

One round, included

Ownership

Yours from day one

Overview

What this engagement is

Some systems cannot be replaced this year, or this decade. Banking cores, insurance platforms and government interfaces still speak SOAP, fixed-width files or worse. We put a REST gateway in front, translating protocols, normalising the field names nobody can remember, and adding the caching and circuit breakers that stop a slow backend from taking your website down with it. Your new applications talk to a clean documented API, and the day the legacy system is finally retired, only the gateway changes.

Deliverables

What lands in your repositories

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 per operation
  • Circuit breaker and timeout handling so backend slowness is contained
  • Request and response logging with sensitive fields redacted
  • Error translation from cryptic backend codes to usable messages
  • Load test results showing behaviour under your expected traffic

Outcomes

What changes once it ships

New development stops paying the legacy tax on every project

A slow or failing backend degrades gracefully instead of cascading

A clean seam for the day the old system is finally replaced

Process

How the 4 stages run

  1. 01

    Analyse

    the legacy interface is documented, including undocumented behaviour

  2. 02

    Design

    REST resources mapped to backend operations and error cases catalogued

  3. 03

    Build

    gateway implemented with caching, retries and observability

  4. 04

    Prove

    load tested and run in parallel before your applications switch over

Booked most often by

  • Companies building modern front ends over a system they cannot replace
  • Teams whose every new project rewrites the same integration code
  • Products where legacy latency is damaging the customer experience

What we need from you

  • Access to the legacy system, or a test environment that behaves like it
  • Whatever documentation exists, however old
  • Someone who remembers the quirks, even if they no longer work on it daily

These are collected in the technical brief that opens in your dashboard the moment payment clears. The clock starts when they arrive, not before.

Answers

Questions this engagement raises

That is common. We work from traffic capture and behaviour testing, and the resulting documentation is part of what you get.

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

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

This is engineering work, not a physical product — nothing ships and there is no stock to run out of. Delivery is to the working days stated above, into systems you control, and the refund terms set out what happens if we miss the date.

Booked alongside

Engagements that pair with this one

All APIs & Integrations

GST included

₹34,999

Capacity open this month

Read the scope. Know the price. Start on Monday.

No discovery calls to find out a number, no statements of work that take three weeks to sign. Pick the engagement that matches the problem and we assign the engineers.

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