Migrating a Monolith to Microservices

Breaking apart a 500K-line Django codebase into domain-specific Go services.

Daniel Okonkwo

Senior Software Engineer

1 min read read

ArchitectureGoBackend

**Project Overview:** A comprehensive case study demonstrating my approach to *migrating a monolith to microservices* as a Senior Software Engineer.

Context

Our core Django monolith was taking 45 minutes to deploy, and teams were stepping on each other's toes daily. Database locks were causing production incidents.

Architecture

I led the design of an event-driven architecture using Kafka. We established clear bounded contexts and began strangling the monolith by routing traffic through an API gateway.

main.go

// A simplified example of our new Go-based routing service
package main

import (
	"fmt"
	"net/http"
)

func main() {
	http.HandleFunc("/api/v2/orders", handleOrders)
	http.ListenAndServe(":8080", nil)
}

func handleOrders(w http.ResponseWriter, r *http.Request) {
	// Event-driven logic here...
	fmt.Fprint(w, "Orders service proxy")
}

-85%

Deploy Time

99.99%

Uptime

The Execution Strategy

To tackle this challenge, I relied on a combination of deep research, iterative development, and tight feedback loops with stakeholders. We moved quickly to validate our core assumptions before scaling the solution.

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