Greenroom, named Marketing's fastest growing digital agency in 2003, will design and produce the site, which is due to launch in the spring.
Nick Evans, director of Impact, said: "As an innovative agency, we were looking for a digital company that equalled our commitment and passion for the Impact brand and appointing Greenroom was an obvious choice. We are hugely excited to be creating a dynamic online presence with Greenroom and aim to reinforce our specialised recruitment service."
Jon Hamm, Greenroom's creative director, added: "Impact already has a very strong graphic identity, which is used in its promotional literature as well as in its advertising. The challenge was to extend this identity sympathetically into the online arena, creating a marketing tool for the company itself, as well as a resource for prospective candidates."
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