Freelancers expense a dozen subscriptions — proposals, contracts, invoices, time tracking — against irregular income. Owning the tools outright removes a whole line of fixed costs.
The tool this job usually means renting is Greenhouse / BambooHR, at $100s/mo — roughly $2,400 a year, every year. Hirestack does the job for a one-time $49 — running on infrastructure you control.