The London agency pitched against tech teams from Citigate and Buffalo to win a year-long retainer with Prologic, a fashion specialist that provides computer systems for high-end retailers including department store Liberty.
The account, thought to be worth at least £100,000, will be led by ITPR directors Bob Dearsley and Kieran Kent.
Prologic, listed on the London Stock Exchange, joins a client roster at ITPR that includes health search engine SearchMedica, business advisory Vantis and mobile data company Beat Systems.