Microservices Transformation

Project Overview

As Technical Lead, I spearheaded the transformation of a business-critical monolithic application into a modern microservices architecture. This project was crucial for the company's technical modernization strategy and involved working with a team of 12 developers across multiple locations.

The Challenge

The legacy system had grown over 15 years into a complex, difficult-to-maintain monolith with:

Over 2 million lines of code
Multiple databases with complex dependencies
Long release cycles (quarterly)
Increasing technical debt
Performance bottlenecks that couldn't be easily addressed

Technical Approach

We adopted a strangler pattern approach to gradually decompose the monolith:

Service Identification: We conducted domain-driven design workshops to identify bounded contexts
API Gateway: Implemented an API gateway as the entry point for all client requests
Gradual Migration: Prioritized services based on business value and technical risk
DevOps Transformation: Built a complete CI/CD pipeline with automated testing
Monitoring and Observability: Implemented centralized logging, tracing, and metrics

Architecture

The new architecture consists of:

Domain-oriented microservices with dedicated databases
Event-driven communication using RabbitMQ
Centralized authentication and authorization
API gateway for client communication
Comprehensive monitoring and alerting

Results

The transformation delivered significant business benefits:

Deployment frequency increased from quarterly to daily
60% reduction in critical production issues
45% improvement in system performance
Ability to scale individual components independently
Teams able to work autonomously on separate services

Technologies Used

.NET Core for service implementation
Docker and Kubernetes for containerization
SQL Server and MongoDB for data storage
RabbitMQ for message queuing
Azure DevOps for CI/CD
Prometheus and Grafana for monitoring