It's not all of IT, but it's not unusual for quant dev type roles to report to the front-office (either singly or as part of a dual-reporting structure). The reporting doesn't have to be direct for dev bonuses to be tied to PnL either, what I've seen happen at some places is that a certain percentage of the desk bonus pool is assigned to the development team and the development team management than decide how to split that pool among the developers.

Go to efinancialcareers and search for "PnL bonus" if you want to see some examples of job specs mentioning it.