What are the roles of the engineers who only work on one car?
Generally speaking, there are five key engineers for each car - the Race Engineer, the Performance Engineer, the Controls Engineer, the Engine Performance Engineer and the Engine Systems Engineer.
The job of the Race Engineer is to act as the link between the team and the driver. They are the single point of contact for the driver whenever he is in the car - he's like a second set of eyes and ears for the driver and will inform him about the situation on track. What lap times are the others doing? Is there any traffic coming up? Are there hazards on the track?
The Race Engineer is also the main point of contact for all of the factory to learn about the driver feedback from the car, and do everything in their power to deliver maximum performance to his driver and to ensure a smoothly executed, successful race weekend.
The Performance Engineer works very closely with the Race Engineer - prior to, during and after the race weekend. Where the Race Engineer takes responsibility of managing front of house - making sure that the car and programme are properly managed - the Performance Engineer is a little more in the bowels of the car, pouring over telemetry and simulations, offering the driver advice on how to squeeze the last milliseconds from the car.
He will also look at particular performance subsystems such as the differential (the amount of torque transfer between the rear wheels) or the brake balance. Based on the car data he will give feedback to the Race Engineer who will inform the driver of a setting that promises to be faster, for example by changing the brake balance for a specific corner.