Freelance marketing (1 month) for London app company

London-based app company requires part-time (up to 20 hours p/w) freelance marketing manager to own:
1. user acquisition via Facebook pay per install, affiliate partnerships and other routes
2. user engagement via social, email, push, affiliate etc

The candidate will have proven capability across all of these areas, ideally with experience of developing overall marketing propositions and general design/copywriting skills. Ideally 2-4 days of month on site (London) with remote working for the remainder of the time.