Jennifer Poole joined Downing Street on Monday to take the role of news and content manager, with a brief to improve Number 10's website copy and other content.
She is working directly for Nick Jones in the nine-strong digital comms team. Jones joined earlier this month as interim head of digital at Number 10 and the Cabinet Office, although he also continues in his existing role of interactive director for the COI.
One insider said of Poole's hire: 'They have been a bit low on resources after the large restructuring. She's a good strong content person.'
Another recent appointment to the team is Anthony Simon, who joined as senior digital campaigns manager in August. The moves follows the merging of Downing Street and the Cabinet Office comms units into a single team.
A Downing Street source said: 'Digital comms is a completely merged team because it now supports Number 10, the Deputy Prime Minister and the Cabinet Office's work.'
Poole had worked at BIS for two years and was previously a senior speechwriter at the former Department for Innovation, Universities and Skills. She has also worked as a ministerial speechwriter at the Department for Children, Schools and Families.
It is understood that Jones is expected to be working closely with Michael Warren's cross-government campaigns unit.
The news comes as Cabinet Office content manager Claire Collins goes on maternity leave, after which she will return to the Foreign & Commonwealth Office, from where she was seconded.