I heard from multiple people working at Stripe that selling yourself is a huge reason why they think it's a very bad place to work. You apparently have to make full-on folders to showcase what you have done.
All of the places I've worked at that have come close to this style of self-promotion have been dominated by kingdom builders and professional bullshitters.
Ugh, sounds horrible. This is what happens when extroverted bullshitters get to decide the rules around career advancement. Your ability to write self-promotional marketing slop counts for as much as or more than the actual work you were hired to do. I say this as someone who is right now grudgingly writing self-promotional marketing slop instead of doing my job.
