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Re:Ask HN: Ever been hired through a “who's hiring” post? by noescape on Wednesday November 02, 2016 @09:45PM (#12860962)
And, what is this particular skill set?
Re:Ask HN: Ever been hired through a “who's hiring” post? by fencepost on Wednesday November 02, 2016 @10:27PM (#12861164)
Well, at the time something in the list of "C++ (Boost, STL), Python, SQL (PostgreSQL, SQLite), git" caught his eye.

Since it was RethinkDB I suspect the combination of C++ (which RethinkDB is written in), Python (one of the 4 languages for which there are/were "official" libraries), experience with 2 different DBMSs and an interest in "a challenge as a backend enginer to further hone my C++ skills" were probably all factors.