Smith worked on the Mastercard account during her time at Frukt, and has a background in international events through her involvement with financial brand activations at electronic dance music festivals throughout Europe.
She also worked on the Shell account while at Imagination.
Due to Sledge’s growing presence in the UAE, Smith will work across a mixture of the agency’s clients.
Laura Capell, managing director of Sledge, said: "We are very happy to have Sophie join the team, genuine passion and enthusiasm is really important to us and Sophie has this in bucket loads."
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