Foster joins from Northern & Shell, the publisher of the Daily Express and Sunday Express, owned by Richard Desmond. She was previously Mindshare’s head of display and mobile.
She said: "Bauer Media has a fantastic set of media brands, premium content, extensive audience data and ambitious plans in the digital space.
"I am very excited to be a part of the team which will be pushing the boundaries in digital advertising campaigns to help our advertisers engage with audiences across multiple platforms."
Foster will report to Richard Dunmall, Bauer’s group managing director of advertising, and will be tasked with developing digital products such as InStream, which uses demographic and location targeting for ads used in Absolute Radio’s web app.
Dunmall said: "Digital is a huge strategic growth area for us in the UK and globally, and this appointment comes on the back of increasing demand from clients and agency partners for digitally-centred commercial solutions."