What's everyone's actual stack right now? (Intro thread for new joiners)

Curious to know what's running where. Drop your stack as a quick intro:

- Headcount + states
- HCM / payroll platform
- Benefits admin (same platform or separate?)
- Time tracking (built-in or point solution?)
- Performance / engagement (if any)
- One thing you'd swap if you could

Vendor-neutral discussion welcome — there are no wrong answers, only contexts.