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Strangler Fig Migration of a 500k-Line PHP Monolith to Azure AKS

26/45Project Reference
24 weeksEngagement Duration
7 architectsZippyOPS Team
4Measurable Outcomes
The Challenge

What the Client Was Facing

A SaaS company had a 500,000-line PHP monolith that had been in production for 12 years. New features took 6 months to deliver, the codebase was too large for any engineer to understand fully and scaling required scaling the entire application.

Our Role

What ZippyOPS Was Engaged To Do

ZippyOPS was brought in to design and implement a solution addressing the root causes of the client's challenges β€” delivering measurable outcomes within a fixed engagement timeline. Our team worked embedded with the client's engineers throughout the entire project.

The Solution

How We Solved It

ZippyOPS applied the Strangler Fig pattern to incrementally migrate functionality to microservices on Azure AKS without disrupting production. An API gateway was deployed at the boundary with traffic gradually shifted to new services. Linkerd was deployed as the service mesh and each new service followed a golden path template.

Technologies Used

Azure AKS Linkerd Kong Terraform GitHub Actions ArgoCD Grafana Loki Tempo PostgreSQL RabbitMQ
The Results

Measurable Outcomes Delivered

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First 8 services extracted and running independently within 12 weeks

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New feature delivery time reduced from 6 months to 3 weeks for extracted domains

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Cloud cost reduced 42% through right-sized microservice containers vs monolith scaling

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Strangler Fig migration on track β€” 60% of monolith extracted at 24-week milestone

Want Similar Results for Your Team?

Book a free consultation and let's discuss how ZippyOPS can deliver the same transformation for your organisation.

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