Phillip started his career in 1998 as a Journalist at ITWeb. From 2001 to 2003, he was a Writer for Brainstorm magazine. In 2003-2004, he worked as a Journalist at Thisday. Later, for several years Phillip worked as a Freelance writer. From 2005 to 2008, he was a Founding editor of Maverick (magazine) and Empire. From 2009 to 2011, Phillip served as a Founding Deputy editor of Daily Maverick.
In October 2015 he was appointing as acting deputy editor of newspaper Mail & Guardian. Five years earlier that newspaper had described him as a "journalism school dropout. In October 2017 he won a national journalism award for a column about wine gums.
In February 2017 police sought to question De Wet about the leak of a draft government report he had written about.