Ask HN: What tools and processes do you use to manage your small team?

People running or on small teams and companies of say less than 30 people. What's your process for things like expenses and vacation time? Do you use some kind of software to track it or is it all informal? How do you manage all the various group cloud resources like GitHub, Mixpanel, Campfire, AWS, etc.? Who owns/admins the account, or is that responsibility shared? Are employees allowed to buy things with company money, how is that managed? What about servers and infrastructure? Who can spin up servers, modify VMs, deploy etc.? Is there even a process for this or is it mostly ad-hoc?