Social media ads

Looking for a designer / art director that is experienced in creating marketing assets for social media (Facebook, IG and Google display paid ads). Must be familiar with concepting/storying boarding with a copywriter. Should equally be able to see project through to execution and creation of final production grade assets. Must be aware of producing layout to the specifications of major social platforms. Knowledge of graphic design and creative programs essential. A portfolio of relevant work is needed. London or South East based preferred but not essential. Should be available to work on this during in the next week or two.