I think that Salaryman applies to high ranking japanese white collar workers too.
People often say Tanya Degurechaff (from Youjo Senki) in his previous life was a Salaryman and I think that dude around the middle of his company's totem pole (definitely high enough to be the guy that fires some underperforming employees, and still low enough that there was room for him to desire promotions).
The term has a specific meaning in the real world. Quoting Wikipedia:
"Salaryman (サラリーマン, Sarariman, salaried man) refers to a man whose income is salary based, particularly those working for corporations. It has gradually become accepted in Anglophone countries as a noun for a Japanese white-collar worker or businessman. ... The term does not include all workers who receive a set salary, but only "white-collar workers in the large bureaucracy of a business firm or government office." The term includes those who work for government (e.g. bureaucrats) and major companies (e.g. those listed in Nikkei 225). Workers in the mizu shobai (nightlife) and entertainment industries (including actors and singers) are not included even though their income may be salary based. Similarly, doctors, engineers, lawyers, accountants, musicians, artists, politicians, the self-employed, and corporate executives are also excluded."
Let's not turn this into another "Power Trio", where the ATT page bears no resemblance to the real world and thus is useless as a writer's tool.