job description for new media fundraiser

I work for an international NGO with its headquarters in the USA and a much smaller UK office in London. To date, our joint website has been very US-centric – for example, you can donate on it in dollars but not in pounds without being diverted to justgiving.com. A new development team has recently been set up in the UK and we are employing a company to develop a UK-friendly version of the website. However, whilst our fundraising team is currently concentrating on major donors, trusts and events, and looks after a small but slowly growing pool of “lower level” donors as well as a handful who donate online despite the difficulties, we have very little collective experience of fundraising using online methods. Therefore I’d like to employ someone who does – and would appreciate any advice as to what attributes I should be looking for/what I should include in the job description. Thank you.