BLS and O*NET count most HR coordinators as human resources assistants, and O*NET's task list for that occupation shows why: processing, verifying and maintaining personnel documents, recording employee data, explaining policies and benefits, and helping administer benefit programs. These are process jobs. The coordinator makes sure every step happens, on time and documented.
A generalist, by contrast, investigates complaints, advises managers on discipline and interprets policy. If your posting expects that work, budget for a generalist. If it expects a coordinator, say who the coordinator escalates to, so they are not left to make calls on terminations, leave or accommodation on their own.
Form I-9 is a good test of scope. A coordinator often runs the process, so make sure they use a current edition. The edition dated 01/20/25 expires 05/31/2027, and employers using electronic I-9 systems had to update them to that expiration date by July 31, 2026. If your onboarding platform has not been checked since, that is a first-week task.