William Buller will join the Carlin team for this year's GP3 series, completing the British squad's lineup.
The 19-year-old Northern Irishman had completed several GP3 tests with Carlin before securing the drive for 2012.
In yesterday's test at Silverstone he was fifth quickest overall.
Buller is a race winner in the British F3 series, having claimed 13 F3 podiums in total.
"I've tested the GP3 car a few times over the winter with Carlin and it's gone very well," said Buller. "GP3 is now an established series with great racing, plus it has a lot of commercial and sporting benefits for me as I develop my career.
"Live TV on the new Sky Sports F1 channel will be good for my sponsors and the opportunity to show the F1 teams what I can do again is a major plus point for me as a driver.
"I know most of the tracks from Formula BMW, but I am going to gain even more experience of competing on a number of Formula 1 circuits, which will help me as I move forwards in my career."