What's one HR process your team automated that ended up saving the most time?

As organizations grow, even seemingly simple HR tasks can become surprisingly time-consuming. Processes like attendance tracking, leave approvals, onboarding, payroll inputs, and document management often consume significant administrative effort when handled manually.

I’m curious to hear from HR professionals and people managers here:

Was it payroll processing, employee onboarding, attendance management, compliance tracking, or something else? I’d love to learn from real-world experiences and understand what had the biggest impact on your teams.