Engine Yard, a platform to build, manage and host Rails applications, raised a $15 million Series B round of funding from new investors New Enterprise Associates and Amazon. Previous investor Benchmark Capital also participated – Engine Yard has now raised $18.5 million in capital.

Engine Yard competitors Heroku and New Relic have also raised capital this year.

Amazon’s investment is clearly strategic as it expands its own web services products. Engine Yard fits nicely into Amazon’s big picture plans for application tools, hosting and management.

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