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A data ninja is a person who reviews large quantities of data and analyzes, organizes and moves it in such a way that it improves overall data retrieval processes, thus allowing the data to reach end users much more quickly.
A data ninja is similar to a data analyst, but besides analyzing data at rest, this person also optimizes the data access and transfer process.
A data ninja’s primary job responsibility is to create and maintain data-driven systems and architectures with the lowest possible latency. They are usually employed by organizations with large numbers of data viewers, such as content delivery networks, e-commerce services sites and or social networks. They analyze the patterns/statistics of data being sourced from big data repositories, and how they are placed on edge/front-end data servers before they are sent to the Internet/network to reach the destination node.
Data ninjas generally have strong data analysis and data mining skills along with a good understanding of popular data architectures and Internetwork operations (in relation to data transfer).