Well, these are two issues - CV padding, and Mensa as such.
As far as I can tell people reading CVs just scan for keywords and other stupid signals, and completely fail the Turing Test of understanding their content. They believe that things like "years of experience using technology X" are the awesomest signal, and as far as I can tell they're slightly negatively correlated with job performance in software development (the smart people switch technologies every couple of years as a rule), unlike IQ which is known to be highly positively correlated with job performance.
CV readers are just an obstacle you need to get past. So putting something like that might very well work as far as I can tell.
And I intended to give an actual percentile as extrapolated from stddev, which seems to be quite considerably higher than Mensa low threshold. This is slightly dishonest, as the test is not calibrated to this range, but naively speaking 152 on mean 100 stddev 16 means top 0.06%, which is the number I intended to stick on my CV, saying it's British Mensa-supervised test to make it sound more valid.
Mensa themselves say they aim to take the top 2% of the population. This strikes me as too many to be useful. There are other high-IQ societies which are far more selective (Wikipedia's Mensa page has a list), but none of them are household names.
It's not a typical OB/LW subject, but Robin correctly pointed out that most rationalists are outside OB/LW, and so I'm asking about one of the organizations that might hold many of them.
A couple of weeks ago I took a supervised IQ test by Mensa due to curiosity and for some CV padding (cheap signaling is a perfectly rational thing to do). Now I got a letter back from them that I'm in top whatever %, and they'd like me to join. I wasn't really planning joining Mensa, or anything else, so I'm wondering - does any of fellow rationalists have any experience with them? Is it worth bothering?
As a bonus here's a quick description of their supervised IQ testing process:
They compute percentile based on both tests separately, and higher of two counts as the result. So you can has 0 points on one (if at all possible), and respectively 148 / 132 on the other, and you're in (2 stddev above mean, or top 2%). The tests obviously check knowledge of obscure English words and meanings and ability to deal with pressure in addition to intelligence as such. Well, I guess no test is perfect.
So Mensa - good or bad?