John Jackson

I’m a seasoned senior software engineer with 10 years of experience developing and maintaining applications using .NET and Java. I focus on designing robust systems, optimizing performance, and delivering reliable software on time through cross-functional collaboration.

At eBay, I developed order processing and inventory management features with .NET Core and Java (Spring Boot), including order validation, inventory tracking, and stock updates with strong data synchronization. I also helped migrate a monolithic system to microservices, enabling independent scaling and improving capacity during high demand.

I’ve built event-driven synchronization with Apache Kafka so updates propagate across services when inventory or order statuses change. I’ve also implemented secure authentication and role-based access control using ASP.NET Core Identity and Spring Security to ensure data security and adherence to access policies.

Earlier roles strengthened my backend foundation in financial transaction processing, including multi-currency support, REST API development, and automated reconciliation with Spring Batch and Entity Framework. I’m motivated by improving existing systems to meet evolving business needs—especially through scalable architecture, security, and measurable operational reliability.