Tarling will lead the user experience team across a corporate, public sector and charity client base.
Former head of user experience Peter Gayle is understood to have left earlier this year to join digital marketing consultancy Blue Latitude.
A raft of other appointments have been announced, including Claire Triggs as producer working on project management, client liaison, documentation and new business. Triggs joins from digital consultancy Worth, where she worked on the delivery of websites.
Internal appointments include Rachel Adler’s promotion to head of production. She was formerly a producer. All appointments have now taken effect.