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Middleware

Middleware is software that sits between systems to coordinate communication, transform data, route actions, or apply integration logic.

Middleware is software that sits between systems and helps coordinate communication, data transformation, routing, or business logic between them.

It provides an intermediary layer rather than requiring every system to connect directly to every other system.

What It Means in Practice

Without middleware:

Website → CRM
Website → Email
Website → Accounting
Website → Booking system

With middleware:

               → CRM
Website → Middleware → Email
               → Accounting
               → Booking system

The middleware becomes responsible for part of the coordination.

What Middleware Can Do

Middleware may:

Automation platforms can sometimes act as middleware.

Custom backend services can too.

Why It Matters

Point-to-point integrations become difficult to manage as the number of systems increases.

If every system contains custom logic for every other system, changing one platform may require changing many connections.

Middleware can centralize some of that logic.

Middleware vs. API

An API is an interface.

Middleware is a system that uses interfaces to coordinate interactions between other systems.

For example:

CRM API * accounting API * middleware = automated invoice workflow.

Common Problems

Common problems include:

  • Middleware becoming another undocumented critical dependency
  • All business logic hidden in automation workflows
  • Nobody monitoring failed runs
  • Credentials scattered across workflows
  • Too many small automations
  • Data transformations not documented
  • One middleware platform becoming Vendor Lock-In

How to Improve

Use middleware to simplify relationships rather than hide them.

Document:

  • Trigger
  • Source system
  • Destination system
  • Data mapping
  • Credentials
  • Failure behaviour
  • Retry behaviour
  • Owner

For critical integrations, ensure logs and failure notifications are available.