I worked across customer projects in software architecture, technical leadership, backend development, DevOps, cloud infrastructure, and consulting roles.

Quality and extensible document processing

After deployment incidents caused by insufficient validation, I led improvements across unit, integration, and Selenium end-to-end test coverage. I also designed a document import engine for PDF, CSV, and XLS files using contracts and the Chain of Responsibility pattern, allowing formats and processing rules to be added with minimal impact. The Laravel implementation used asynchronous workflows and real-time notifications.

Technical leadership and mentoring

I supported a small Symfony team dealing with performance and architectural issues caused by incorrect use of Doctrine concepts such as dirty checking, Entity Manager state, and lifecycle events. I mentored the developers on ORM behavior, reduced unnecessary database writes and technical debt, and guided the adoption of Laravel for projects where its simpler development model better matched the team's needs.

Cloud governance and cost reduction

I identified AWS security and cost issues including root-account usage, oversized resources, and missing access policies. I introduced Kubernetes-based AWS infrastructure, IAM governance, and resource optimizations that reduced operational cloud costs by approximately 80%.

Production JVM troubleshooting

For a Java application crashing every few hours, I taught the customer team how to collect and analyze production heap dumps and investigate JVM and classloader behavior. We traced the memory leak to an external dependency and stabilized production by upgrading the affected package.