Enterprise Messaging Modernization

01 Overview

Overview

Replaced brittle point-to-point integration with a clearer messaging backbone, contract ownership, and operational visibility.

02 Business / Engineering Context

Business / Engineering Context

Enterprise integration had grown through point-to-point connections that no longer isolated failure or ownership.

03 Problem

Problem

Point-to-point integrations accumulated hidden coupling, making change risky and failures hard to isolate.

04 Constraints

Constraints

• Existing producers and consumers had to move without a global rewrite
• Poison messages and downstream outages had to be operable

05 Architecture

Architecture

• Topic/queue boundaries aligned to business events
• Contract ownership for producers and consumers
• Retry, dead-letter, and replay as designed behaviour
• Reduced direct system-to-system coupling

06 Architecture Decisions

Architecture Decisions

• Retry, dead-letter, and replay are designed behaviour
• Contract ownership sits with producers and consumers, not with an implicit mesh of pairwise links

09 Resilience

Resilience

Poison messages and downstream outages were treated as expected operating conditions.

10 Observability

Observability

Lag, failure, and replay needed to be operable, not only technically possible.

12 Outcomes

Outcomes

• A production messaging backbone with clearer contract ownership
• Failures isolated at integration boundaries instead of cascading silently

14 Current State

Current State

Completed production messaging backbone. Published here in sanitized form.