There is a U shaped curve here. Even in the US, boasting on a resume is considered 'non-elite' and 'low-class' once you reach high enough levels. If you have w

There is a U shaped curve here. Even in the US, boasting on a resume is considered 'non-elite' and 'low-class' once you reach high enough levels. If you have won international accolades or have a recognizable marker of prestige, then your credentials do the talking for you. Boasting can be seen as compensating for a less than stellar resume. You don't need to mention any qualitative technical creds if you've won international competitions, published at top conferences or are the maintainer of a high-stars open source project. Similarly, for the first few years out of undergrad, your resume gets shorter before it gets longer. It is a recognition of dropping useless credentials from your resume, to keep only the high priority markers of prestige /impact among all your undergrad cruft. It it shows a certain confidence in what you have listed (1 great project is enough), recognition of the limited time spent on it by a recruiter, and an understanding as someone who has an "insider's" view into the industry. Famously, the most elite will have an almost inconvienently barebones profile, as a flex. (Practically, Often to avoid terrible recruiters and getting a high SNR ratio)