Yes, he runs a motorsport consultancy business with his father that does a lot of things including track designs
The one to be finished soon is Kymi Ring in Finland; it'll host MotoGP race there starting next year and they've already been in talks with F1 for the future too.
He's also working on the new circuit in Saudi Arabia which is a very ambitious project as it's expected to be the longest one in the world with several radical features and numerous elevation changes. The plans are to have it ready for 2022 season.
Another one he's been linked with is a new circuit in Rio.