Monolith to Microservices

The Challenge

A 10-year-old monolithic PHP application was the backbone of the client's business. It was hosting everything: user authentication, billing, core application logic, and reporting.

Any surge in traffic to the reporting module would bring down the entire site, including the login page. Deployments were "scary events" that required 3 hours of downtime.

The Solution

We used the "Strangler Fig" pattern to incrementally migrate functionality to a new microservices architecture.

• Containerization: First, we Dockerized the legacy app to run it in a modern orchestration environment (Kubernetes).
• Service Decomposition: We peeled off high-risk modules one by one (Auth, Billing, Notifications) into separate Node.js microservices.
• API Gateway: Implemented an API Gateway to route traffic seamlessly between the old monolith and the new services, invisible to the end user.

The Result

The system is now resilient. If the reporting service crashes, users can still log in and pay their bills. Deployments are automated and zero-downtime.