EU citizens must apply for Settled/Pre-Settled Status to continue to live and work in the UK, or alternatively must be sponsored to work in the UK in the future.
To obtain Settled Status, an applicant must have been living in the UK for five continuous years. If they have not been in the UK for that period of time, they will generally obtain Pre Settled Status which allows a EU citizen to continue to accrue time in the UK to obtain Settled Status. They must have started living in the UK by 31st December 2020. The deadline for Settled/Pre Settled Status applications is June 30 2021 but the Home Office is running a pilot scheme ahead of the public launch of the scheme in March 2019 for EU staff in some sectors to assist the provision of crucial services.