Cabral, 28, wrote and art directed the "balls" spot for Sony Bravia, which won the platinum award at the Creative Circle Awards. Most recently, Walker, 35, created the new Ask.com campaign, including the "wanderer" TV spot.
Both creatives will continue to work on a number of accounts, but Cabral will have overall responsibility for the Sony account, while Walker will lead the newly won Orange business.
Flintham said: "Micah and Juan have made a massive contribution to the agency. As we grow, it makes sense to have great people exposed to clients in a bigger way."