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Those technologies were brand new at the time, the discussions about the problem started in 2013. The company (I had zero input) choose a more established vendor with an older product. Given the time and institutional customers that were trusting us with their data, I suspect any cloud based offerings were a nonstarter, and open source felt like a liability.

Of course with 20/20 hindsight that decision is easy to criticize. I suspect their primary concerns were to minimize risk and costs while meeting our customer's requirements. Even today, making a brand new Google product or Facebook backed open source project a hard dependency would be too much risk for an established business.