hey there! One of the engineers from Buffer here :). Good spot on the numbers being roughly equivalent to the salary of one of the engineers. Thanks for bringing that up. This was something we were mindful about and so the work we did took us roughly 12-15 man days (3 of us working on it in fits and starts * some rough calculations :D ). As important though is we did take away a lot of lessons from this that will hopefully save us even more in the future which is one of the major goals here :)