Inside Netflix, Amazon, eBay, and others, we see the benefits of microservices architecture, not to mention immersion in open source, again and again. At hyperscale, large investments in automation for both developers and operations almost always pay off. The same goes for big data analysis of Web clickstreams to optimize the user experience.
At eBay and others, perhaps the most important lesson is that no matter how "modern" you are, you always need to look ahead, experiment, and prepare for the next technology shift. That cutting-edge technology you adopted early will be legacy in no time, and in hypercompetitive areas like the business-to-consumer space, you can't afford to fall behind.
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