The closer to the trade you are the higher bonus is as a percentage of your total comp. I did mention "front office" in my original post.

- Infrastructure is vital to most trades. Bonuses are going to more than 30% if you're on the cutting edge here - prop shops, some technology oriented hedge funds, and some banks.

- If by tools you mean GUIs then no.

- Engineers who write trading algos (or more likely algo components that are used by a trader at a higher level) will have a bonus that is more than 30%.