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Re:Ask HN: Best places to advertise for developers (non-star... by max_ on Sunday July 24, 2016 @12:29PM (#12153709)
Reddit! :D a gigantic number are technically savvy
Re:Ask HN: Best places to advertise for developers (non-star... by mrfusion on Sunday July 24, 2016 @09:24PM (#12155906)
Where specifically?
Re:Ask HN: Best places to advertise for developers (non-star... by max_ on Monday July 25, 2016 @03:41AM (#12157081)
https://www.reddit.com/advertising

You can narrow down to subreddits like r/programming, r/python, r/machinelearning etc