Amazon European Fulfillment Network systems

The EFN environment supported Amazon's EU businesses through operationally critical internal systems, where availability, low latency, data correctness, and safe change management all mattered at once.

I worked across requirements engineering, feature design, data pipelines between services, and automation around marketplace launch and testing in EMEA. I also owned and extended inventory and item-pool systems written in Java, including commingling and EU inventory-import flows, while participating in the operational discipline expected of high-scale internal services.

That work covered systems handling more than 300K requests per second at roughly 6ms p90 latency, widened inventory choices across EU countries, reduced prices through broader supply availability, and saved business users about 200 hours of manual work in the first month of one launch.

Large-scale internal systems teach discipline quickly: requirements quality, safe rollout design, and operational clarity matter as much as the implementation itself when the business surface is this large.