Payroll Software

Didn't support non-US employees (had to use a different service for canadian employees), mobile app was very limited, and for some reason there were bugs with reimbursements, which easily got very hard to track down for a lot of employees

I've used Gusto in the past for a company that scaled to###-###-#### people briefly. It was super easy to use but doesn't scale well once your team gets big.

Alternatively, if you don't plan on scaling your team anytime soon, I've been in talks with this new company called every.io in my current YCombinator batch, that claims to do payroll, bookkeeping, and tax. I could make an intro if you'd like -- but keep in mind they are still very new.