Why We Replaced 14 Microservices with a Modular Monolith (And Saved $18,000/Month)

How moving away from distributed microservice sprawl back to a clean Go & TypeScript modular monolith cut P99 latency by 88% and eliminated distributed transaction failures.

Executive Summary

A deep-dive technical breakdown of consolidating 14 isolated microservices into a Domain-Driven Design (DDD) modular monolith with unified PostgreSQL ACID guarantees.

Author: Zain Ali, Head of Engineering