At Black Sofa we're keen to assist international candidates once you have a UK visa. Most commonly candidates come to us with a tier 2 or tier 5 visa.
If you do not currently have a tier 2 or tier 5 visa and do not have otherwise have the right to work, we recommend you review the process for visa sponsorship and apply directly to relevant businesses listed on the UK government's register.
Good luck on your visa application and please do get in touch once you have a visa, which can be transferred.
UK Government - register of sponsors