People on reddit are idiots. The first to actually go at pretty much every tech company are recruiters. This makes sense because why have recruiters on the payroll when you aren't even hiring.

Second to go are low performers, people that aren't well liked for whatever reason and usually sales/events types of employees. A lot of the tech companies with previously progressive cultures then get rid of all the non-sense positions that were created when times were good like "Vibe Manager" and "Head of People". Then everywhere else like you mentioned in other departments like IT, Legal, Finance, HR etc.

Software and hardware engineers are actually the last on the chopping block because they are the ones who actually make the products that generate revenue and they are easily head hunted to other companies so retaining them is of upmost importance to many companies.