One of the bitter lessons I learned in my SWE career is that looking the part is almost everything. The meme boomer advice of "dress for the job you want, not the one you have" is remarkably true if you broaden the definition of "dress". Race, gender, lookism, age, everything matters in your career.

Career progression gets easier just by being the right age, or being the right race (whatever that is at your company), or being the right gender (again, depends on your company). Grooming and personal fitness are easy wins. I've never seen an obese or unkempt executive or middle manager.

Even the way you move makes a difference. If you stay past 4:30pm, you're destined to be an IC forever. Leadership-track people leave the office early even if it means taking work home, because it shows that you have your shit together. Leadership-track people eat lunch alone, not at the gossipy "worker's table". And of course, the way you dress matters (men look more leadership-material by dressing simple and consistent, for women it's the opposite). It's all about keeping up appearances.