A Certificate of Sponsorship (CoS) is a crucial document required for non-UK nationals who want to work in the UK. It's an electronic document that contains important information about the job offer, the employee's personal details, and the sponsor's responsibilities.
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First, you'll need to make sure that you meet the eligibility requirements for a skilled worker visa uk. This includes having a job offer from a UK employer that is on the list of eligible occupations, as well as meeting the minimum salary threshold for your occupation. You'll also need to pass an English language proficiency test and score enough points on the UK's points-based system.