API Engineering & Legacy Modernization

Most integration work fails at the seams. We put an explicit contract in front of every system — an OpenAPI specification, versioned endpoints, idempotent writes and a documented error model — then migrate consumers onto it one at a time. Legacy replacement runs through a strangler-fig pattern so the old system keeps serving traffic until the new one has proven itself.

What the service includes

• OpenAPI 3 specification written before implementation
• REST and GraphQL services, webhooks and message queues
• Third-party integrations: ERP, CRM, payment providers, e-invoicing
• Strangler-fig migration so the legacy system is retired in stages
• Data migration with reconciliation reports, not a one-way import
• Authentication, rate limiting, audit logging and versioning policy

How it runs

1. 01 · Technical discovery

   A paid or complimentary discovery session, depending on scope. We document the current systems, the constraints and the success criteria in writing before quoting anything.

2. 02 · Architecture & scope

   Target architecture, data model, integration contracts and a phase plan. You receive the document whether or not you continue with us.

3. 03 · Implementation

   Two-week iterations against the agreed backlog, with a demonstrable increment and a written progress report at the end of each one.

4. 04 · Hardening & handover

   Load and security testing, runbook, backup verification, knowledge transfer, and transfer of repositories and infrastructure accounts to the client.