I've not used ArangoDB in any serious way. However, the co-founder and a lead engineer met with me in Seattle this week, and these guys are clearly very, very

I've not used ArangoDB in any serious way. However, the co-founder and a lead engineer met with me in Seattle this week, and these guys are clearly very, very experienced serious engineers. They wanted to pick my brain about what to focus on regarding changefeeds, since I have experience using changefeeds in production via RethinkDB, and the ArangoDB devs hope to implement some variant of changefeeds soon. I also found out that ArangoDB's functionality is motivated by the founder's decade of experience building custom highly efficient software for companies; e.g., this is why the ArangoDB index is optimized to be entirely in memory. Their devs also have a strong interest in innovating on new algorithms, in addition to implementing known algorithms.